CN111574513A - Monomer for biomass benzoxazine shape memory resin and preparation method and application thereof - Google Patents
Monomer for biomass benzoxazine shape memory resin and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a shape memory resin based on biomass benzoxazine and a preparation method and application thereof, biomass furfuryl amine and paraformaldehyde are taken as raw materials, and an aldehyde group-containing biomass benzoxazine monomer is obtained through heating reaction under a proper condition; mixing the biomass benzoxazine monomer containing aldehyde group with polyetheramine, and performing coupling reaction to obtain a Schiff base biomass benzoxazine monomer; and curing the Schiff base biomass benzoxazine monomer to obtain the biomass benzoxazine resin with the shape memory function. The preparation method has the advantages of simple preparation process, no need of solvent in the synthesis process, high yield, green and environment-friendly raw materials and capability of greatly reducing the dependence of high polymer materials on fossil resources. Compared with the prior art, the benzoxazine shape memory resin has excellent thermal property (glass transition temperature T)g280 ℃, high tensile modulus (2.46 GPa) and strength (90.4 MPa). By the process of the inventionThe original shape of the obtained benzoxazine resin can be permanently changed according to the requirement, the defect that the traditional cross-linked polymer cannot be processed again after being formed is overcome, the recovery function under the condition of heating stimulation (higher than the glass transition temperature) is realized, and the application range of the shape memory polymer is greatly improved due to excellent thermal property and mechanical property.
Description
Technical Field
The invention relates to shape memory resin based on biomass benzoxazine and a preparation method and an application method thereof, in particular to a monomer for the biomass benzoxazine shape memory resin and a preparation method and an application thereof, belonging to the technical field of functional polymer materials.
Background
Shape Memory Polymers (SMP) are stimuli-responsive polymers that change and set shape under certain conditions, and then are caused to return to their original shape by an external stimulus, such as heat, electricity, light, chemical induction, and the like. SMPs, therefore, have important applications in many areas including aerospace, electronics, medical devices, robotics, information, construction, textiles, commodity products, etc., particularly when they are used as deployment components and structures to enable complex, large-scale and high-volume assembly of devices, thereby greatly facilitating the advancement of many industries.
High performance and greenness are trends in material research and development, as are the developments in SMPs. High heat resistance and high mechanical strength are typical indicators of high performance polymers, however, most SMPs today have a low glass transition temperature (T)g) Therefore, it cannot be applied to aerospace and other fields requiring high heat resistance. On the other hand, the development of solvent-free strategies and the use of biomass polymers are important methods for achieving greenness, but there are few reports on studies on green production of SMP.
Benzoxazine resin is a typical heat resistant thermosetting resin which not only has a high TgThe resin has the advantages of high storage modulus, almost zero shrinkage in the curing process and the like, has strong structural modification capacity, and can be prepared into resins with different properties by adopting different raw materials (phenol and amine). These inherent advantages of benzoxazine resins provide substantial advantages for the preparation of high performance SMPs. However, to date, existing pure benzoxazine resins tend to be brittle, and copolymerization of benzoxazine resins with other resins can also achieve shape memory properties, but these resins are not biomass resins and TgAre all below 170 ℃. In short, no biomass benzoxazine resin has shape memory properties.
In summary, the prior art has made great progress in the development of shape memory polymers, however, the development of biomass benzoxazine shape memory resins with high heat resistance, high tensile modulus and strength through a solvent-free strategy still has certain challenges.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a monomer for shape memory resin based on biomass benzoxazine, which has high heat resistance, high tensile modulus and strength, and a preparation method and an application method thereof; the monomer can obtain resin with good heat resistance and shape memory after self-curing.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a monomer for biomass benzoxazine shape memory resin is prepared by the following steps:
(1) heating furfuryl amine, a formaldehyde compound and vanillin for reaction, and then recrystallizing to obtain an aldehyde group-containing benzoxazine monomer;
(2) and coupling and reacting the benzoxazine monomer containing aldehyde group with polyetheramine to obtain a Schiff base benzoxazine monomer which is a monomer for biomass benzoxazine shape memory resin.
And curing the biomass benzoxazine shape memory resin by using a monomer to obtain the biomass benzoxazine-based shape memory resin.
In the step (1), the furfuryl amine and the formaldehyde compound are stirred and mixed at room temperature, and then the vanillin is added; the formaldehyde compound is formaldehyde and/or paraformaldehyde; the molar ratio of the furfuryl amine to the formaldehyde compound to the vanillin is 100: 200-220: 100; the heating reaction temperature is 80-90 ℃ and the time is 4-6 h; and (4) recrystallizing by using ethanol.
In the step (2), the coupling reaction does not need a solvent, and the product does not need to be purified; the temperature of the coupling reaction is 125-130 ℃, and the time is 1-2 h; the molar ratio of the benzoxazine monomer containing aldehyde group to the polyether amine is 100: 50.
In the invention, the Schiff base benzoxazine monomer is defoamed and then cured; the curing temperature is 150-240 ℃ and the curing time is 10-24 h. Preferably, in the step (3), the curing is in a step heating mode, the heat preservation time at the temperature of each step is not less than 1h, and the temperature difference of adjacent steps is not more than 30 ℃.
Specifically, the monomer for the biomass benzoxazine shape memory resin is prepared as follows:
(1) mixing 100 parts of furfuryl amine and 200-220 parts of formaldehyde in parts by mole, stirring at room temperature for 15min, then adding 100 parts of vanillin, stirring and reacting a reaction system at the temperature of 80-90 ℃ for 4-6h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain an aldehyde group-containing benzoxazine monomer;
(2) mixing 100 parts of benzoxazine monomer containing aldehyde and 50 parts of polyetheramine D-230 (with the molecular weight of 230) according to molar parts, reacting for 1-2h at the temperature of 125-130 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base benzoxazine monomer;
and (3) defoaming the Schiff base benzoxazine monomer obtained in the step (2), and curing to obtain the shape memory resin based on biomass benzoxazine.
The invention discloses an application of the monomer for biomass benzoxazine shape memory resin in preparing a shape memory material, and an application of the monomer for biomass benzoxazine shape memory resin in preparing shape memory resin based on biomass benzoxazine; in particular, the biomass benzoxazine-based shape memory resin prepared by the monomer has excellent deformation recovery performance without copolymerization of other resins.
The invention discloses a shape change and recovery method of biomass benzoxazine-based shape memory resin prepared from a monomer for biomass benzoxazine shape memory resin, which comprises the following steps:
(1) changing the biomass benzoxazine-based shape memory resin having an original shape into a new shape at a deformation temperature; then heating, and cooling to room temperature to obtain the biomass benzoxazine-based shape memory resin with a new shape to complete shape change;
(2) heating the biomass benzoxazine-based shape memory resin with the new shape to a deformation temperature, and recovering the biomass benzoxazine-based shape memory resin with the new shape to the original shape to complete shape recovery.
In the technical scheme, in the step (1), the heating temperature is 290-300 ℃, and the time is 20-30 s; the deformation temperature is 10-20 ℃ above the glass transition temperature of the shape memory resin based on the biomass benzoxazine.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, biomass raw materials of furfuryl amine and vanillin are used as raw materials to synthesize a benzoxazine monomer with a Schiff base structure, and the furfuryl amine and vanillin are green biomass raw materials.
2. The shape memory resin prepared by the monomer and based on the biomass benzoxazine has outstanding heat resistance and glass transition temperature (T)g) Is 280 ℃, and simultaneously has high tensile modulus (2.40 GPa) and strength (90.4 MPa), thereby providing a reliable foundation for the application of the resin in the advanced field, the high heat resistance of the resin is benefited by the participation of furan in the resin in crosslinking and a large amount of hydrogen bond structures in the crosslinking network, and the excellent mechanical property is caused by the combined action of rigid benzoxazine structures and flexible polyether amine structures in the crosslinking network.
4. The biomass benzoxazine-based thermosetting shape memory resin prepared by the monomer has the advantage of changing the initial shape, so that the crosslinked network of the resin is reconstructed, and a stable permanent shape is obtained. The application method overcomes the defect that the traditional cross-linked polymer cannot be processed again after being formed, and the shape recovery rate of the prepared shape memory resin based on the biomass benzoxazine is as high as 98%.
5. The preparation method of the monomer for the biomass benzoxazine shape memory resin adopts a solvent-free method, is green and environment-friendly, has a simple preparation process, avoids the use of a large amount of solvents in the preparation process, and is easy for industrial large-scale production; meanwhile, when the biomass benzoxazine-based shape memory resin prepared by the monomer is applied, the original shape can be permanently changed according to the requirement, the defect that the traditional cross-linked polymer cannot be processed again after being formed is overcome, and the processing cost of the original structure is saved.
Drawings
FIG. 1 is a synthesis reaction formula for preparing an aldehyde group-containing benzoxazine monomer in example 1 of the present invention;
FIG. 2 is the NMR spectrum of the monomer containing the aldehyde group benzoxazine in example 1 of the present invention: (1H NMR）；
FIG. 3 is the NMR spectrum of the monomer containing the aldehyde group benzoxazine in example 1 of the present invention: (13C NMR）；
FIG. 4 is a synthesis reaction formula for preparing a Schiff base-containing benzoxazine monomer in example 1 of the present invention;
FIG. 5 is the NMR spectrum of the Schiff base-containing benzoxazine monomer in example 1 of the present invention: (1H NMR）；
FIG. 6 is an IR spectrum of a benzoxazine monomer containing Schiff base and a cured product in example 1 of the present invention;
FIG. 7 is a dynamic thermo-mechanical analysis (DMA) curve of a shape memory resin based on biomass benzoxazine prepared according to example 1 of the present invention;
FIG. 8 is a stress-strain curve of a shape memory resin based on biomass benzoxazine prepared according to example 1 of the present invention;
FIG. 9 is a shape memory electron image of a shape memory resin based on biomass benzoxazine prepared in example 1 of the present invention;
FIG. 10 is a schematic diagram of the present invention for preparing shape memory resins based on biomass benzoxazine.
Detailed Description
The invention discloses a preparation process of a monomer for biomass benzoxazine shape memory resin, which does not need a solvent and specifically comprises the following steps:
(1) heating furfuryl amine, a formaldehyde compound and vanillin for reaction, and then recrystallizing to obtain an aldehyde group-containing benzoxazine monomer;
(2) and coupling and reacting the benzoxazine monomer containing aldehyde group with polyetheramine to obtain a Schiff base benzoxazine monomer which is a monomer for biomass benzoxazine shape memory resin.
And curing the Schiff base benzoxazine monomer to obtain the shape memory resin based on the biomass benzoxazine.
The schematic diagram can refer to fig. 10.
The technical scheme of the invention is further described with reference to the accompanying drawings and embodiments; all starting materials are commercially available and the test methods involved are conventional in the art.
Example 1
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine and 6.00g of paraformaldehyde (CAS #: 30525-89-4), stirring for 15min at room temperature, then adding 15.22g of vanillin, stirring for reaction for 5h at the temperature of 85 ℃, naturally cooling to room temperature, adding ethanol for recrystallization to remove impurities, and drying the solid to obtain the biomass benzoxazine monomer containing aldehyde groups.
In this example, the synthesis reaction formula, the nuclear magnetic resonance hydrogen spectrum and the nuclear magnetic resonance carbon spectrum of the benzoxazine monomer containing the aldehyde group biomass are respectively shown in fig. 1, fig. 2 and fig. 3.
Referring to the attached figure 2, which is a nuclear magnetic resonance hydrogen spectrum based on the aldehyde group-containing biomass benzoxazine monomer provided in example 1 of the present invention, about 9.81ppm represents active H on the aldehyde group, and about 5.08ppm and 4.09ppm represent H on the oxazine ring, which indicates that the aldehyde group-containing biomass benzoxazine monomer was successfully synthesized.
Referring to fig. 3, which is a nuclear magnetic resonance carbon spectrum based on the benzoxazine monomer containing aldehyde group biomass provided in example 1 of the present invention, C characteristic peaks on the aldehyde group are represented at about 190.8ppm, and C characteristic peaks on the oxazine ring are represented at about 83.3ppm and 56.0 ppm.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 27.31g of biomass benzoxazine monomer containing aldehyde group and 11.50g of polyetheramine D-230 (molecular weight is 230), reacting for 1h at the temperature of 125 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base biomass benzoxazine monomer.
The reaction is a coupling reaction as can be seen from the synthesis reaction formula of the Schiff base biomass benzoxazine monomer provided in the embodiment of FIG. 4.
Referring to the attached figure 5, which is a nuclear magnetic resonance hydrogen spectrum based on the Schiff base biomass benzoxazine monomer provided in example 1 of the invention, about 8.15ppm represents active H on an aldehyde group, and about 5.01ppm and 4.02ppm represent H on an oxazine ring, which shows that the Schiff base biomass benzoxazine monomer is successfully synthesized.
(3) Preparation of shape memory resin based on biomass benzoxazine
Putting 10.0g of Schiff base biomass benzoxazine monomer into a mold, putting the mold into an oven for defoaming (10 min at 150 ℃), then putting the mold into a forced air drying oven, and curing according to the processes of 160 ℃/2h + 180 ℃/2h + 200 ℃/2h + 220 ℃/2h + 240 ℃/2h in sequence; and after the solidification is finished, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine, wherein the infrared spectrum, the glass transition temperature and the tensile strength of the shape memory resin are respectively shown in the attached figures 6, 7 and 8.
Referring to FIG. 6, it is an IR spectrum of the Schiff base benzoxazine monomer and cured product of example 1. Compared with the spectrogram of a Schiff base benzoxazine monomer, the out-of-plane vibration peak of an oxazine ring and a hydrocarbon in the spectrogram of the Schiff base benzoxazine resin disappears (914 cm)-1) The asymmetric stretching vibration and the phenolic hydroxyl peak of C-O-C respectively appear at 1288 cm-1And 3331 cm-1Indicating the formation of a crosslinked network.
See fig. 7, which is a dynamic thermo-mechanical analysis (DMA) curve of a shape memory resin based on biomass benzoxazine. It can be seen that the biomass benzoxazine-based thermosetting shape memory resin prepared in example 1 has a storage modulus of 4.20GPa at 25 ℃. Its glass transition temperature (T)g) The temperature is 280 ℃, and the biomass benzoxazine shape memory resin prepared by the invention is proved to have outstanding heat resistance.
T of the polyetheramine benzoxazines disclosed in the prior artg(DMA) is about 100 ℃ and is prepared from polyetherT of amine benzoxazine-polyurethane copolymer resing(DMA) is up to 167 ℃, see the Master's scientific article of shape memory polyether amine type benzoxazine synthesis and performance research' of golden cypress, T of benzoxazine resin prepared therefromg(DMA) is 40-91 ℃; suxuehui's Master's academic paper on synthesis and shape memory performance of cresol-type benzoxazine ', T of benzoxazine resin prepared from itg(DMA) 68-123 ℃; lei Cuiyu Shuo Shi graduation paper of "preparation and Properties of Methoxyphenol/Polyetheramine type benzoxazine", T of benzoxazine-polyurethane copolymer resin prepared therefromg(DMA) 33-167 ℃. CN105111438A discloses a polyetheramine benzoxazine which has good heat resistance but does not have shape memory and cannot change the original shape into a fixed new shape after heating.
The benzoxazine prepared by the above-disclosed technology is prepared by mannich reaction based on two raw materials of petroleum-based phenol and polyetheramine, and the finally prepared benzoxazine resin cannot simultaneously satisfy high heat resistance and shape memory property. Meanwhile, the synthetic method of benzoxazine in the above-disclosed technology is not a general synthetic method, and in related work, the applicant replaces petroleum-based phenolic raw materials with bio-based raw material vanillin, and prepares the polyether amine main chain type benzoxazine monomer by three methods, namely a solvent method and a solvent-free method, respectively, and does not obtain a target product, for which reason, it is found that aldehyde groups in vanillin and polyether amine react preferentially to generate schiff base, and the benzoxazine monomer cannot be prepared through mannich reaction, and the specific operation is as follows:
the method comprises the following steps: mixing 1.52g of vanillin, 1.15g of polyetheramine D-230 (molecular weight 230) and 0.6g of paraformaldehyde, reacting for 4 hours, 5 hours or 6 hours at the temperature of 85 ℃, naturally cooling to room temperature, adding 20mL of chloroform, washing three times with 20mL of 1N NaOH solution (washing off unreacted phenolic raw materials), collecting an organic layer, drying with anhydrous sodium sulfate, and evaporating the solvent to obtain the product.
The method 2 comprises the following steps: adding 1.52g of vanillin, 1.15g of polyetheramine D-230 (molecular weight is 230) and 0.6g of paraformaldehyde into 20mL of chloroform, reacting at reflux temperature for 4h, 5h or 6h, naturally cooling to room temperature, washing with 20mL of 1N NaOH solution for three times (washing off unreacted phenolic raw materials), collecting an organic layer, drying with anhydrous sodium sulfate, and evaporating the solvent to obtain the product.
The method 3 comprises the following steps: adding 1.52g of vanillin, 1.15g of polyetheramine D-230 (molecular weight 230) and 0.6g of paraformaldehyde into 20mL of ethanol, reacting at reflux temperature for 4h, 5h or 6h, evaporating the solvent, adding 20mL of chloroform, washing with 20mL of 1N NaOH solution for three times (washing off unreacted phenolic raw materials), collecting the organic layer, drying with anhydrous sodium sulfate, and evaporating the solvent to obtain no product.
From the above synthetic experiments and summary of the properties of the benzoxazine resin synthesized from polyetheramine disclosed in the prior art, the raw material formulation and the synthetic technique disclosed in the prior art are not suitable for preparing the shape memory benzoxazine resin with high heat resistance. In the present application, a two-step synthesis is innovatively used: firstly, reacting vanillin with furfuryl amine to obtain a benzoxazine monomer containing aldehyde groups, wherein furan in the furfuryl amine can participate in crosslinking in thermal curing, so that the heat resistance of the resin is improved. Secondly, different from the disclosed technology, the polyether amine is used as a coupling reaction raw material instead of a Mannich reaction raw material, and the prepared Schiff base type benzoxazine monomer has a rigid group and a flexible group at the same time, so that a foundation is laid for preparing the shape memory benzoxazine resin with high heat resistance. The invention obviously provides a new technical idea, develops a new Schiff base biomass benzoxazine monomer and obtains a product with excellent heat resistance and shape memory performance.
See fig. 8, which is a stress-strain curve for a shape memory resin based on biomass benzoxazine. It can be seen that the tensile modulus and the tensile strength of the shape memory resin based on biomass benzoxazine prepared in example 1 at normal temperature are 2.46GPa and 90.4MPa respectively, which proves that the shape memory resin based on biomass benzoxazine prepared by the invention has outstanding mechanical properties.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 20 ℃ above the glass transition temperature, namely 300 ℃, the shape memory resin based on the biomass benzoxazine with the original shape is changed into a required new shape under the action of external force; then keeping the temperature at 300 ℃ and keeping external force to perform reversible exchange reaction of Schiff base dynamic bonds in the polymer system; then cooling to room temperature, and fixing the new shape to form a new permanent shape of the shape memory resin based on the biomass benzoxazine; the biomass benzoxazine-based shape memory resin with the new permanent shape is heated to 20 ℃ above the glass transition temperature, and after the heat preservation is carried out for 40s, the polymer automatically returns to the original shape from the new permanent shape.
See fig. 9, which is a shape memory electron image of a shape memory resin based on biomass benzoxazine. The shape memory recovery rate of the biomass benzoxazine-based shape memory resin prepared in example 1 reaches 98% calculated from the deformation angle, and the shape memory resin prepared by the invention is proved to have outstanding shape memory performance.
According to the above deformation-recovery method, the new shape is designed into other shapes such as a circle shape and an S shape, and the shape memory recovery rate of the shape memory resin based on biomass benzoxazine also reaches 96% or more.
The reaction time of the step (2) of example 1 was adjusted to 0.5 hour, and the rest was unchanged, so as to obtain a shape memory resin T based on biomass benzoxazineg(DMA) was 241 ℃.
The reaction time of the step (2) of the example 1 is adjusted to be 3 hours, and the rest is unchanged, so that the T of the shape memory resin based on the biomass benzoxazine is obtainedg(DMA) 259 ℃.
And (3) directly curing the aldehyde group-containing biomass benzoxazine monomer prepared in the step (1) according to the same process as in the step (3), so that the obtained resin has no shape memory property.
Example 2
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine and 6.60g of paraformaldehyde, stirring at room temperature for 15min, then adding 15.22g of vanillin, stirring the reaction system at 85 ℃ for reaction for 5h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain the biomass benzoxazine monomer containing aldehyde groups.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 30.04g of biomass benzoxazine monomer containing aldehyde group and 12.65g of polyetheramine D-230 (molecular weight is 230), reacting for 1.5h at the temperature of 125 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base biomass benzoxazine monomer.
(3) Preparation of shape memory resin based on biomass benzoxazine
Putting 11.0g of Schiff base biomass benzoxazine monomer into a mold, putting the mold into an oven for defoaming (10 min at 150 ℃), and then putting the mold into a forced air drying oven. Sequentially carrying out curing according to the processes of 160 ℃/2h + 180 ℃/2h + 200 ℃/2h + 220 ℃/2h + 240 ℃/2 h. And after the end, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 20 ℃ above the glass transition temperature, namely 300 ℃, the shape memory resin based on the biomass benzoxazine with the original shape is changed into a required new shape under the action of external force; then keeping the temperature at 300 ℃ and keeping external force to perform reversible exchange reaction of Schiff base dynamic bonds in the polymer system; then cooling to room temperature, and fixing the new shape to form a new permanent shape of the shape memory resin based on the biomass benzoxazine; after heating the biomass benzoxazine-based shape memory resin with a new permanent shape to 20 ℃ above the glass transition temperature, after 40s, the polymer will automatically revert from the new permanent shape to the original shape.
Example 3
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine and 15g of 40wt% formaldehyde aqueous solution, stirring at room temperature for 15min, then adding 15.22g of vanillin, stirring the reaction system at 85 ℃ for reaction for 5h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain the biomass benzoxazine monomer containing aldehyde groups.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 27.31g of biomass benzoxazine monomer containing aldehyde group and 11.50g of polyetheramine D-230 (molecular weight is 230), reacting for 2h at the temperature of 125 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base biomass benzoxazine monomer.
(3) Preparation of shape memory resin based on biomass benzoxazine
10.5g of Schiff base biomass benzoxazine monomer is put into a mold, the mold is put into an oven for defoaming (10 min at 150 ℃), and then the mold is put into a forced air drying oven. Sequentially carrying out curing according to the processes of 160 ℃/2h + 180 ℃/2h + 200 ℃/2h + 220 ℃/2h + 240 ℃/2 h. And after the end, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 20 ℃ above the glass transition temperature, namely 300 ℃, the shape memory resin based on the biomass benzoxazine with the original shape is changed into a required new shape under the action of external force; then keeping the temperature at 300 ℃ and keeping external force to perform reversible exchange reaction of Schiff base dynamic bonds in the polymer system; then cooling to room temperature, and fixing the new shape to form a new permanent shape of the shape memory resin based on the biomass benzoxazine; after heating the biomass benzoxazine-based shape memory resin with a new permanent shape to 20 ℃ above the glass transition temperature, after 40s, the polymer will automatically revert from the new permanent shape to the original shape.
Example 4
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine and 6.0g of paraformaldehyde, stirring at room temperature for 15min, then adding 15.22g of vanillin, stirring the reaction system at the temperature of 80 ℃ for reaction for 4h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain the biomass benzoxazine monomer containing aldehyde groups.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 32.77g of biomass benzoxazine monomer containing aldehyde group and 3.8g of polyetheramine D-230 (molecular weight is 230), reacting for 1.0h at 130 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base biomass benzoxazine monomer.
(3) Preparation of shape memory resin based on biomass benzoxazine
Putting 11.0g of Schiff base biomass benzoxazine monomer into a mold, putting the mold into an oven for defoaming (10 min at 150 ℃), and then putting the mold into a forced air drying oven. Sequentially carrying out curing according to the processes of 160 ℃/2h + 180 ℃/2h + 200 ℃/2h + 220 ℃/2h + 240 ℃/2 h. And after the end, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 20 ℃ above the glass transition temperature, namely 300 ℃, the shape memory resin based on the biomass benzoxazine with the original shape is changed into a required new shape under the action of external force; then keeping the temperature at 300 ℃ and keeping external force to perform reversible exchange reaction of Schiff base dynamic bonds in the polymer system; then cooling to room temperature, and fixing the new shape to form a new permanent shape of the shape memory resin based on the biomass benzoxazine; after heating the biomass benzoxazine-based shape memory resin with a new permanent shape to 20 ℃ above the glass transition temperature, after 40s, the polymer will automatically revert from the new permanent shape to the original shape.
Example 5
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine and 6.0g of paraformaldehyde, stirring at room temperature for 15min, then adding 15.22g of vanillin, stirring the reaction system at the temperature of 80 ℃ for reaction for 5h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain the biomass benzoxazine monomer containing aldehyde groups.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 27.31g of biomass benzoxazine monomer containing aldehyde group and 11.50g of polyetheramine D-230 (molecular weight is 230), reacting for 1.5h at 130 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base biomass benzoxazine monomer.
(3) Preparation of shape memory resin based on biomass benzoxazine
Putting 11.0g of Schiff base biomass benzoxazine monomer into a mold, putting the mold into an oven for defoaming (10 min at 150 ℃), and then putting the mold into a forced air drying oven. Sequentially carrying out curing according to the processes of 160 ℃/2h + 180 ℃/2h + 200 ℃/2h + 220 ℃/2h + 240 ℃/2 h. And after the end, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 20 ℃ above the glass transition temperature, namely 300 ℃, the shape memory resin based on the biomass benzoxazine with the original shape is changed into a required new shape under the action of external force; then keeping the temperature at 300 ℃ and keeping external force to perform reversible exchange reaction of Schiff base dynamic bonds in the polymer system; then cooling to room temperature, and fixing the new shape to form a new permanent shape of the shape memory resin based on the biomass benzoxazine; after heating the biomass benzoxazine-based shape memory resin with a new permanent shape to 20 ℃ above the glass transition temperature, after 40s, the polymer will automatically revert from the new permanent shape to the original shape.
Example 6
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine and 6.0g of paraformaldehyde, stirring at room temperature for 15min, then adding 15.22g of vanillin, stirring the reaction system at the temperature of 80 ℃ for reaction for 6h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain the biomass benzoxazine monomer containing aldehyde groups.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 32.77g of biomass benzoxazine monomer containing aldehyde group and 13.8g of polyetheramine D-230 (molecular weight is 230), reacting for 2h at 130 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base biomass benzoxazine monomer.
(3) Preparation of shape memory resin based on biomass benzoxazine
Putting 11.0g of Schiff base biomass benzoxazine monomer into a mold, putting the mold into an oven for defoaming (10 min at 150 ℃), and then putting the mold into a forced air drying oven. Sequentially carrying out curing according to the processes of 160 ℃/2h + 180 ℃/2h + 200 ℃/2h + 220 ℃/2h + 240 ℃/2 h. And after the end, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 20 ℃ above the glass transition temperature, namely 300 ℃, the shape memory resin based on the biomass benzoxazine with the original shape is changed into a required new shape under the action of external force; then keeping the temperature at 300 ℃ and keeping external force to perform reversible exchange reaction of Schiff base dynamic bonds in the polymer system; then cooling to room temperature, and fixing the new shape to form a new permanent shape of the shape memory resin based on the biomass benzoxazine; after heating the biomass benzoxazine-based shape memory resin with a new permanent shape to 20 ℃ above the glass transition temperature, after 40s, the polymer will automatically revert from the new permanent shape to the original shape.
Example 7
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine and 6.0g of paraformaldehyde, stirring at room temperature for 15min, then adding 15.22g of vanillin, stirring and reacting at the temperature of 90 ℃ for 4h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain the biomass benzoxazine monomer containing aldehyde groups.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 27.31g of biomass benzoxazine monomer containing aldehyde group and 11.50g of polyetheramine D-230 (molecular weight is 230), reacting for 1h at the temperature of 125 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base biomass benzoxazine monomer.
(3) Preparation of shape memory resin based on biomass benzoxazine
Putting 11.0g of Schiff base biomass benzoxazine monomer into a mold, putting the mold into an oven for defoaming (10 min at 150 ℃), and then putting the mold into a forced air drying oven. Curing is carried out according to the processes of 160 ℃/1h + 180 ℃/1h + 200 ℃/1h + 220 ℃/1h + 240 ℃/1h in sequence. And after the end, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 20 ℃ above the glass transition temperature, namely 300 ℃, the shape memory resin based on the biomass benzoxazine with the original shape is changed into a required new shape under the action of external force; then keeping the temperature at 300 ℃ and keeping external force to perform reversible exchange reaction of Schiff base dynamic bonds in the polymer system; then cooling to room temperature, and fixing the new shape to form a new permanent shape of the shape memory resin based on the biomass benzoxazine; after heating the biomass benzoxazine-based shape memory resin with a new permanent shape to 20 ℃ above the glass transition temperature, after 40s, the polymer will automatically revert from the new permanent shape to the original shape.
Example 8
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine and 6.0g of paraformaldehyde, stirring at room temperature for 15min, then adding 15.22g of vanillin, stirring and reacting the reaction system at the temperature of 90 ℃ for 5h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain the biomass benzoxazine monomer containing aldehyde groups.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 27.31g of biomass benzoxazine monomer containing aldehyde group and 11.50g of polyetheramine D-230 (molecular weight is 230), reacting for 1h at the temperature of 125 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base biomass benzoxazine monomer.
(3) Preparation of shape memory resin based on biomass benzoxazine
Putting 11.0g of Schiff base biomass benzoxazine monomer into a mold, putting the mold into an oven for defoaming (10 min at 150 ℃), and then putting the mold into a forced air drying oven. Curing is carried out according to the processes of 160 ℃/1.5 h + 180 ℃/1.5 h + 200 ℃/1.5 h + 220 ℃/1.5 h + 240 ℃/1.5 h in sequence. And after the end, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 20 ℃ above the glass transition temperature, namely 300 ℃, the shape memory resin based on the biomass benzoxazine with the original shape is changed into a required new shape under the action of external force; then keeping the temperature at 300 ℃ and keeping external force to perform reversible exchange reaction of Schiff base dynamic bonds in the polymer system; then cooling to room temperature, and fixing the new shape to form a new permanent shape of the shape memory resin based on the biomass benzoxazine; after heating the biomass benzoxazine-based shape memory resin with a new permanent shape to 20 ℃ above the glass transition temperature, after 40s, the polymer will automatically revert from the new permanent shape to the original shape.
Example 9
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine and 6.0g of paraformaldehyde, stirring at room temperature for 15min, then adding 15.22g of vanillin, stirring the reaction system at 85 ℃ for reaction for 5h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain the biomass benzoxazine monomer containing aldehyde groups.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 30.04g of biomass benzoxazine monomer containing aldehyde group and 12.65g of polyetheramine D-230 (molecular weight is 230), reacting for 1h at the temperature of 125 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base biomass benzoxazine monomer.
(3) Preparation of shape memory resin based on biomass benzoxazine
Putting 11.0g of Schiff base biomass benzoxazine monomer into a mold, putting the mold into an oven for defoaming (10 min at 150 ℃), and then putting the mold into a forced air drying oven. The curing is carried out according to the processes of 150 ℃/2h + 170 ℃/2h + 190 ℃/2h + 210 ℃/2h + 240 ℃/2 h. And after the end, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 20 ℃ above the glass transition temperature, namely 300 ℃, the shape memory resin based on the biomass benzoxazine with the original shape is changed into a required new shape under the action of external force; then keeping the temperature at 300 ℃ and keeping external force to perform reversible exchange reaction of Schiff base dynamic bonds in the polymer system; then cooling to room temperature, and fixing the new shape to form a new permanent shape of the shape memory resin based on the biomass benzoxazine; after heating the biomass benzoxazine-based shape memory resin with a new permanent shape to 20 ℃ above the glass transition temperature, after 40s, the polymer will automatically revert from the new permanent shape to the original shape.
Example 10
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine and 6.0g of paraformaldehyde, stirring at room temperature for 15min, then adding 15.22g of vanillin, stirring the reaction system at 85 ℃ for reaction for 5h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain the biomass benzoxazine monomer containing aldehyde groups.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 32.77g of biomass benzoxazine monomer containing aldehyde group and 13.8g of polyetheramine D-230 (molecular weight is 230), reacting for 1h at the temperature of 125 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base biomass benzoxazine monomer.
(3) Preparation of shape memory resin based on biomass benzoxazine
10.5g of Schiff base biomass benzoxazine monomer is put into a mold, the mold is put into an oven for defoaming (10 min at 150 ℃), and then the mold is put into a forced air drying oven. And curing is carried out according to the processes of 150 ℃ per 2h, 180 ℃ per 2h, 210 ℃ per 2h, and 240 ℃ per 2 h. And after the end, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 20 ℃ above the glass transition temperature, namely 300 ℃, the shape memory resin based on the biomass benzoxazine with the original shape is changed into a required new shape under the action of external force; then keeping the temperature at 300 ℃ and keeping external force to perform reversible exchange reaction of Schiff base dynamic bonds in the polymer system; then cooling to room temperature, and fixing the new shape to form a new permanent shape of the shape memory resin based on the biomass benzoxazine; after heating the biomass benzoxazine-based shape memory resin with a new permanent shape to 20 ℃ above the glass transition temperature, after 40s, the polymer will automatically revert from the new permanent shape to the original shape.
Example 11
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine and 6.0g of paraformaldehyde, stirring at room temperature for 15min, then adding 15.22g of vanillin, stirring and reacting at the temperature of 90 ℃ for 4h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain the biomass benzoxazine monomer containing aldehyde groups.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 30.04g of biomass benzoxazine monomer containing aldehyde group and 12.65g of polyetheramine D-230 (molecular weight is 230), reacting for 1h at the temperature of 125 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base biomass benzoxazine monomer.
(3) Preparation of shape memory resin based on biomass benzoxazine
10.0g of Schiff base biomass benzoxazine monomer is put into a mold, the mold is put into an oven for defoaming (10 min at 150 ℃), and then the mold is put into a forced air drying oven. Sequentially curing according to the processes of 160 ℃/3h + 180 ℃/3h + 200 ℃/3h + 220 ℃/3h + 240 ℃/3 h. And after the end, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 20 ℃ above the glass transition temperature, namely 300 ℃, the shape memory resin based on the biomass benzoxazine with the original shape is changed into a required new shape under the action of external force; then keeping the temperature at 300 ℃ and keeping external force to perform reversible exchange reaction of Schiff base dynamic bonds in the polymer system; then cooling to room temperature, and fixing the new shape to form a new permanent shape of the shape memory resin based on the biomass benzoxazine; after heating the biomass benzoxazine-based shape memory resin with a new permanent shape to 20 ℃ above the glass transition temperature, after 40s, the polymer will automatically revert from the new permanent shape to the original shape.
Example 12
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine, 3.0g of paraformaldehyde and 7.5g of 40% formaldehyde solution, stirring at room temperature for 15min, adding 15.22g of vanillin, stirring the reaction system at 85 ℃ for reaction for 6h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain the biomass benzoxazine monomer containing aldehyde groups.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 27.31g of biomass benzoxazine monomer containing aldehyde group and 11.50g of polyetheramine D-230 (molecular weight is 230), reacting for 1h at the temperature of 125 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base biomass benzoxazine monomer.
(3) Preparation of shape memory resin based on biomass benzoxazine
10.0g of Schiff base biomass benzoxazine monomer is put into a mold, the mold is put into an oven for defoaming (10 min at 150 ℃), and then the mold is put into a forced air drying oven. Curing is carried out according to the processes of 160 ℃/1h + 180 ℃/1h + 200 ℃/1h + 220 ℃/1h + 240 ℃/1h + 260 ℃/1h in sequence. And after the end, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 300 ℃, the polymer system with the original shape is changed into a required new shape under the action of external force, and the temperature and the external force are maintained, so that the reversible exchange reaction of Schiff base dynamic bonds is carried out in the polymer system; cooling to room temperature and fixing the new shape to become a new permanent shape of the polymer system; heating the polymer system with the new permanent shape to 300 ℃, the polymer will automatically revert from the new permanent shape to the original shape.
Example 13
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine and 6.0g of paraformaldehyde, stirring at room temperature for 15min, then adding 15.22g of vanillin, stirring the reaction system at 85 ℃ for reaction for 5h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain the biomass benzoxazine monomer containing aldehyde groups.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 32.77g of biomass benzoxazine monomer containing aldehyde group and 13.8g of polyetheramine D-230 (molecular weight is 230), reacting for 1h at the temperature of 125 ℃, naturally cooling to room temperature, and drying in vacuum to obtain the Schiff base biomass benzoxazine monomer.
(3) Preparation of shape memory resin based on biomass benzoxazine
10.0g of Schiff base biomass benzoxazine monomer is put into a mold, the mold is put into an oven for defoaming (10 min at 150 ℃), and then the mold is put into a forced air drying oven. The curing is carried out according to the processes of 160 ℃/4 h + 180 ℃/2h + 200 ℃/2h + 220 ℃/2h + 240 ℃/4 h in turn. And after the end, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 20 ℃ above the glass transition temperature, namely 300 ℃, the shape memory resin based on the biomass benzoxazine with the original shape is changed into a required new shape under the action of external force; then keeping the temperature at 300 ℃ and keeping external force to perform reversible exchange reaction of Schiff base dynamic bonds in the polymer system; then cooling to room temperature, and fixing the new shape to form a new permanent shape of the shape memory resin based on the biomass benzoxazine; after heating the biomass benzoxazine-based shape memory resin with a new permanent shape to 20 ℃ above the glass transition temperature, after 40s, the polymer will automatically revert from the new permanent shape to the original shape.
Example 14
(1) Preparation of aldehyde group-containing biomass benzoxazine monomer
Mixing 9.71g of furfuryl amine, 3g of paraformaldehyde and 7.5g of 40% formaldehyde solution, stirring at room temperature for 15min, then adding 15.22g of vanillin, stirring and reacting the reaction system at the temperature of 90 ℃ for 4h, naturally cooling to room temperature, recrystallizing with ethanol to remove impurities, and drying to obtain the biomass benzoxazine monomer containing aldehyde groups.
(2) Preparation of Schiff base biomass benzoxazine monomer
Mixing 27.31g of biomass benzoxazine monomer containing aldehyde group and 11.50g of polyetheramine D-230 (molecular weight is 230), reacting for 1h at 130 ℃, naturally cooling to room temperature, and drying to obtain the Schiff base biomass benzoxazine monomer.
(3) Preparation of shape memory resin based on biomass benzoxazine
10.0g of Schiff base biomass benzoxazine monomer is put into a mold, the mold is put into an oven for defoaming (10 min at 150 ℃), and then the mold is put into a forced air drying oven. And curing is carried out according to the processes of 150 ℃ per 4h, 180 ℃ per 3h, 210 ℃ per 3h, and 240 ℃ per 4 h. And after the end, naturally cooling the resin along with an oven to obtain the shape memory resin based on the biomass benzoxazine.
(4) Application method of shape memory resin based on biomass benzoxazine
When the temperature is heated to 20 ℃ above the glass transition temperature, namely 300 ℃, the shape memory resin based on the biomass benzoxazine with the original shape is changed into a required new shape under the action of external force; then keeping the temperature at 300 ℃ and keeping external force to perform reversible exchange reaction of Schiff base dynamic bonds in the polymer system; then cooling to room temperature, and fixing the new shape to form a new permanent shape of the shape memory resin based on the biomass benzoxazine; after heating the biomass benzoxazine-based shape memory resin with a new permanent shape to 20 ℃ above the glass transition temperature, after 40s, the polymer will automatically revert from the new permanent shape to the original shape.
The invention discloses a shape memory resin based on biomass benzoxazine and a preparation method and application thereof, biomass furfuryl amine and paraformaldehyde are taken as raw materials, and an aldehyde group-containing biomass benzoxazine monomer is obtained through heating reaction under a proper condition; mixing the biomass benzoxazine monomer containing aldehyde group with polyetheramine, and performing coupling reaction to obtain a Schiff base biomass benzoxazine monomer; and curing the Schiff base biomass benzoxazine monomer to obtain the biomass benzoxazine resin with the shape memory function. The preparation method has the advantages of simple preparation process, no need of solvent in the synthesis process, high yield, green and environment-friendly raw materials and capability of greatly reducing the dependence of high polymer materials on fossil resources. Compared with the prior art, the inventionThe benzoxazine shape memory resin has excellent thermal performance (glass transition temperature T)g280 ℃, high tensile modulus (2.46 GPa) and strength (90.4 MPa). The original shape of the benzoxazine resin obtained by the method can be permanently changed according to the requirement, the defect that the traditional cross-linked polymer cannot be processed again after being formed is overcome, the recovery function under the condition of heating stimulation (higher than the glass transition temperature) is realized, and the application range of the shape memory polymer is greatly improved due to excellent thermal property and mechanical property.
Claims (8)
1. The monomer for the biomass benzoxazine shape memory resin is characterized in that the preparation method of the monomer for the biomass benzoxazine shape memory resin comprises the following steps:
(1) heating furfuryl amine, a formaldehyde compound and vanillin for reaction, and then recrystallizing to obtain an aldehyde group-containing benzoxazine monomer;
(2) and coupling and reacting the benzoxazine monomer containing aldehyde group with polyether amine to obtain the monomer for the biomass benzoxazine shape memory resin.
2. The monomer for biomass benzoxazine shape memory resin according to claim 1, wherein: in the step (1), stirring and mixing furfuryl amine and a formaldehyde compound at room temperature, and then adding vanillin; the formaldehyde compound is formaldehyde and/or paraformaldehyde.
3. The monomer for biomass benzoxazine shape memory resin according to claim 1, wherein: in the step (1), the heating reaction is carried out at the temperature of 80-90 ℃ for 4-6 h; and (4) recrystallizing by using ethanol.
4. The monomer for biomass benzoxazine shape memory resin according to claim 1, wherein: in the step (2), no solvent is needed in the coupling reaction, and the product is not needed to be purified; the temperature of the coupling reaction is 125-130 ℃, and the time is 1-2 h.
5. The monomer for biomass benzoxazine shape memory resin according to claim 1, wherein: in the step (2), the molar ratio of the benzoxazine monomer containing aldehyde group to the polyether amine is 100: 50.
6. The monomer for biomass benzoxazine shape memory resin according to claim 1, wherein: in the step (1), the molar ratio of the furfuryl amine to the formaldehyde compound to the vanillin is 100: 200-220: 100.
7. Use of the monomer for biomass benzoxazine shape memory resin according to claim 1 in the preparation of shape memory material.
8. Use of the monomer for biomass benzoxazine shape memory resin according to claim 1 in the preparation of biomass benzoxazine-based shape memory resin.
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