CN112094421A - Modified reduced graphene oxide doped polylactic acid film and preparation method thereof - Google Patents
Modified reduced graphene oxide doped polylactic acid film and preparation method thereof Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 44
- 229920006381 polylactic acid film Polymers 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000004626 polylactic acid Substances 0.000 claims description 50
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 49
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 14
- NPFYZDNDJHZQKY-UHFFFAOYSA-N 4-Hydroxybenzophenone Chemical compound C1=CC(O)=CC=C1C(=O)C1=CC=CC=C1 NPFYZDNDJHZQKY-UHFFFAOYSA-N 0.000 claims description 13
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
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- 239000006185 dispersion Substances 0.000 claims description 10
- 239000003960 organic solvent Substances 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 10
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 9
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 8
- 238000010992 reflux Methods 0.000 claims description 7
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 6
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 claims description 6
- 239000012965 benzophenone Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004108 freeze drying Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 208000034530 PLAA-associated neurodevelopmental disease Diseases 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000009489 vacuum treatment Methods 0.000 claims description 3
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 claims description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 2
- 235000019504 cigarettes Nutrition 0.000 abstract description 16
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- 241000208125 Nicotiana Species 0.000 description 2
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- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 229920001577 copolymer Polymers 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000113 differential scanning calorimetry Methods 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
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- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 235000013599 spices Nutrition 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
- C08G83/001—Macromolecular compounds containing organic and inorganic sequences, e.g. organic polymers grafted onto silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2487/00—Characterised by the use of unspecified macromolecular compounds, obtained otherwise than by polymerisation reactions only involving unsaturated carbon-to-carbon bonds
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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The invention belongs to the technical field of cigarette processing, and provides a modified reduced graphene oxide doped polylactic acid film and a preparation method thereof.
Description
Technical Field
The invention belongs to the technical field of cigarette processing, and particularly relates to a modified reduced graphene oxide doped polylactic acid film and a preparation method thereof.
Background
The cigarette which is not burnt is heated by an external heating element at the temperature of 200-400 ℃, and the tobacco is cracked without burning to generate smoke. Because the volume of the cigarette which is not burnt is relatively small, the cigarette is short, and the cigarette is not cooled by the unfired cigarette branch section and the filter stick which are similar to the traditional cigarette and have longer length, the adoption of the cooling filter stick to reduce the smoke temperature of the cigarette which is not burnt is a key technical measure for heating the cigarette which is not burnt at present.
The polylactic acid (PLA) is prepared by refining, dehydrating, oligomerizing and polymerizing lactic acid prepared from crops such as corn and the like, has the characteristics of good biocompatibility, safety, no toxicity, easiness in processing and the like, and has good application prospect in a cooling section of a filter stick for heating non-burning cigarettes due to the low phase transition temperature (55-60 ℃). When the temperature of the flue gas is higher than the temperature, the polylactic acid material absorbs heat and generates phase change; however, when the temperature is lower than the phase transition temperature, the temperature lowering effect is suppressed, and the object is difficult to achieve. Therefore, the premise that the phase transition temperature is further reduced through polylactic acid modification design is that the polylactic acid is popularized and applied in the field of heating non-combustible cigarettes on a large scale. The Chinese invention patent CN109567271A discloses that alkyl ketene dimer and polylactic acid are copolymerized and the copolymer is attached to an inorganic carrier to be added to a filter rod section as cooling particles, the cooling effect is better due to the uniformity of the addition of a cooling material, but the addition of the inorganic carrier reduces the stability of a phase-change material, has great influence on the smoking resistance of cigarettes and is easy to influence the smoking comfort. The chinese invention patent CN201911106368.5 discloses a polylactic acid film cooling material with hybrid crosslinking of nano-caged inorganic oxide, but because the latent heat of phase change of the inorganic oxide is low, the crosslinked structure affects the mobility of the polymer chain segment, and the like, the cooling effect in practical application is still to be verified.
Graphene has a high thermal conductivity coefficient and is an ideal phase transition temperature regulator. However, as an inorganic material, graphene has poor compatibility with polylactic acid, which easily causes uneven dispersion in the polylactic acid film, and further affects the cooling effect of the polylactic acid film.
Disclosure of Invention
The invention aims to provide a modified Reduced Graphene Oxide doped polylactic acid film and a preparation method thereof, aiming at the defects in the prior art, the polylactic acid is used as a main phase-change material, the polylactic acid graft modified Reduced Graphene Oxide (rGO) is used as a phase-change temperature regulator, and a solution casting film method is adopted to prepare the polylactic acid composite phase-change film material, so that the cooling effect when the cigarette filter is heated and not combusted is improved under the condition of not influencing the suction resistance and the suction comfort.
The object of the invention is achieved by the following technical measures.
The invention provides a modified reduced graphene oxide doped polylactic acid film, wherein the modified reduced graphene oxide doped in the film material is polylactic acid grafted reduced graphene oxide.
The invention also provides a preparation method of the modified reduced graphene oxide doped polylactic acid film, which comprises the following steps:
(1) preparing benzophenone grafted modified reduced graphene oxide: under the protection of inert gas, dispersing 4-hydroxy-benzophenone (BP-OH) and rGO in a certain proportion into an organic solvent; adding a certain amount of potassium carbonate serving as a catalyst into the dispersion system, fully stirring and heating to boil, and reacting for a certain time under a reflux condition; and after the reaction is finished, cooling the temperature of a reaction system to room temperature, centrifugally separating rGO, fully washing with water to remove potassium carbonate, and freeze-drying to obtain the benzophenone grafted and modified rGO (rGO-BP).
The preferable mass ratio of BP-OH to rGO is 1: 1 to 1: 20; the preferred mass ratio of the potassium carbonate to the rGO is 1: 5 to 1: 20; the organic solvent is preferably one of ethanol, n-propanol, isopropanol, ethylene glycol, acetonitrile, tetrahydrofuran and dioxane; the reflux reaction time is preferably 4 to 12 hours.
(2) Preparing polylactic acid grafted modified reduced graphene oxide: mixing PLA and rGO-BP in a certain proportion in a solvent and uniformly dispersing; and (3) placing the dispersion under an ultraviolet lamp for radiation grafting reaction for a certain time, centrifugally separating rGO, fully washing with a solvent to remove ungrafted PLA, and freeze-drying to obtain PLA grafted rGO (rGO-PLA).
The preferable molecular weight of the PLA is 10000-300000 g/mol; the preferable mass ratio of PLA to rGO-BP is 1: 20 to 1: 1; the solvent is preferably water or an alcohol organic solvent capable of dissolving PLA; the radiation grafting reaction time is preferably 5 to 60 minutes; the ultraviolet light wavelength is preferably 365 nm.
(3) Preparing a modified reduced graphene oxide doped polylactic acid film: uniformly mixing rGO-PLA and PLA according to a certain proportion and dispersing the mixture into an organic solvent; and (3) preparing the dispersion liquid into a film by solvent volatilization by adopting a solution casting method, and carrying out vacuum treatment on the obtained film at 80 ℃ for a certain time to obtain the modified reduced graphene oxide doped polylactic acid film.
The preferable mass ratio of the rGO-PLA to the PLA is 1: 50 to 1: 5; the organic solvent is preferably one or a mixture of two of ethanol, isopropanol, n-propanol and glycol; the vacuum heat treatment time is preferably 1 to 8 hours.
According to the invention, polylactic acid graft modified reduced graphene oxide with good compatibility with polylactic acid is prepared by forming ether bonds through simple alkaline condensation suitable for industrial production and carrying out a photo-initiated free radical reaction, and then the modified reduced graphene oxide doped polylactic acid composite phase-change film material is prepared by adopting a solution casting film forming technology commonly used in the industry, so that the modified reduced graphene oxide doped polylactic acid composite phase-change film material can be applied to a cooling filter rod section for heating non-burning cigarettes, and the smoke temperature is effectively reduced.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. compared with the existing polylactic acid and polylactic acid composite material applied to the cooling filter rod section of the cigarette without burning, the phase-change auxiliary material used for reducing the graphene oxide is modified by polylactic acid grafting, has good compatibility with the main polylactic acid material, can realize the uniform distribution of the graphene in the film, forms a uniform heat-conducting network in the film and achieves better cooling effect.
2. The introduced reduced graphene oxide has higher specific surface area and oxygen-containing functional groups, can provide corresponding space for loading spices with different tastes, and is beneficial to the development of novel tobaccos with different tastes.
3. The adopted condensation technology, photoinitiated free radical reaction and tape casting film forming technology have simple and convenient equipment and operation process required by the technology, and are suitable for large-scale industrial production.
Drawings
Fig. 1 is a schematic diagram of a preparation process of a polylactic acid graft-modified reduced graphene oxide material used in the present invention.
FIG. 2 is a scanning electron micrograph of the rGO-PLA prepared in example 1.
Fig. 3 is a scanning electron micrograph of the modified reduced graphene oxide-doped polylactic acid thin film prepared in example 1.
Fig. 4 is a graph of thermal conductivity of the film materials prepared in example 1, example 2, example 3, example 4 and a control sample of pure PLA film.
Detailed Description
The present invention will be further understood from the following examples, which are intended to illustrate and explain the present invention.
Example 1
A preparation method of a modified reduced graphene oxide doped polylactic acid film comprises the following steps:
(1) preparing benzophenone grafted modified reduced graphene oxide: under the protection of inert gas, 0.5g of 4-hydroxy-benzophenone (BP-OH) and 5g of rGO are dispersed into 120mL of ethanol; adding 1g of potassium carbonate serving as a catalyst into the dispersion system, fully stirring, heating to boil, and reacting for 8 hours under a reflux condition; after the reaction is finished, the temperature of a reaction system is reduced to room temperature, rGO is centrifugally separated, the reaction system is washed with water for three times to remove potassium carbonate, and the reaction system is frozen and dried to obtain 5.16g of benzophenone grafted and modified rGO (rGO-BP).
(2) Preparing polylactic acid grafted modified reduced graphene oxide: preparation process As shown in FIG. 1, 1g of PLA (average molecular weight 152000 g/mol) and 4g of rGO-BP are mixed and uniformly dispersed in 100mL of ethanol; placing the dispersion liquid under an ultraviolet lamp with the wavelength of 356nm for radiation grafting reaction for 20min, centrifugally separating rGO, washing with deionized water and ethanol for three times in sequence to remove ungrafted PLA, and freeze-drying to obtain 4.56g of PLA grafted rGO (rGO-PLA). FIG. 2 is a scanning electron micrograph of the prepared rGO-PLA from which it can be seen that grafting of PLA did not alter the lamellar morphology of the rGO.
(3) Preparing a modified reduced graphene oxide doped polylactic acid film: uniformly mixing and dispersing 2g of rGO-PLA and 10g of PLA in 50mL of isopropanol; pouring the dispersion liquid into a polytetrafluoroethylene culture dish with the diameter of 15cm, volatilizing a solvent in an oven preheated to 60 ℃ to prepare a film, and carrying out vacuum treatment on the obtained film at 80 ℃ for 2h to obtain the modified reduced graphene oxide doped polylactic acid film, wherein the average thickness of the film is 140 micrometers. FIG. 3 is a scanning electron micrograph of the prepared film, from which it can be seen that the surface of the film is relatively flat and no defects or cracks are evident. FIG. 4 is a graph showing the thermal conductivity of the film prepared in this example, 0.61W/mK; the glass transition temperature of the film was 45.4 ℃ and the melting temperature was 158 ℃ by differential scanning calorimetry.
Example 2
The experimental procedure was the same as in example 1 except that the amount of rGO-PLA used in step (3) was 1g, the vacuum heat treatment time was 8 hours, the thickness of the prepared film was 126 μm, the thermal conductivity of the film was 0.52W/mK, the glass transition temperature of the film was 43.3 ℃ and the melting temperature was 159 ℃.
Example 3
The experimental procedure was the same as in example 1, except that the molecular weight of PLA in step (2) was 300000g/mol, the amount of PLA used was 0.4g, and the UV irradiation time was 1 hour; the amount of the rGO-PLA used in the step (3) is 0.75g, the amount of the PLA is 10.75g, the vacuum heat treatment time is 1h, the thickness of the prepared film is 130 micrometers, the thermal conductivity of the film is 0.42W/mK, the glass transition temperature of the film is 39.1 ℃, and the melting temperature of the film is 157 ℃.
Example 4
The experimental procedure is the same as example 1, except that the molecular weight of PLA in step (2) is 10000g/mol, the amount of PLA is 0.2g, and the ultraviolet irradiation time is 1 h; the amount of rGO-PLA used in step (3) was 0.5g, the thickness of the prepared film was 123 microns, the thermal conductivity of the film was 0.28W/mK, the glass transition temperature of the film was 36.9 ℃ and the melting temperature was 158 ℃.
Example 5
The experimental procedure was the same as in example 1, except that in step (1), 0.25g of 4-hydroxybenzophenone, 0.25g of potassium carbonate, isopropanol as a solvent, a reflux time of 12 hours, a film thickness of 137 μm and a thermal conductivity of 0.60W/mK were used; the glass transition temperature of the film was 45.1 ℃ and the melting temperature was 158 ℃.
Example 6
The experimental procedure was the same as in example 1, except that the amount of 4-hydroxybenzophenone used in step (1) was 5g, the reflux time was 4 hours, the thickness of the prepared film was 133. mu.m, and the thermal conductivity was 0.61W/mK; the glass transition temperature of the film was 45.2 ℃ and the melting temperature was 157 ℃.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A modified reduced graphene oxide doped polylactic acid film is characterized in that: the modified reduced graphene oxide doped in the film material is polylactic acid grafted reduced graphene oxide.
2. A preparation method of a modified reduced graphene oxide doped polylactic acid film is characterized by comprising the following steps: the preparation method comprises the following steps:
(1) preparing benzophenone grafted modified reduced graphene oxide: under the protection of inert gas, dispersing 4-hydroxy-benzophenone (BP-OH) and rGO in a certain proportion into an organic solvent; adding a certain amount of potassium carbonate serving as a catalyst into the dispersion system, fully stirring and heating to boil, and reacting for a certain time under a reflux condition; after the reaction is finished, cooling the temperature of a reaction system to room temperature, centrifugally separating rGO, fully washing with water to remove potassium carbonate, and freeze-drying to obtain benzophenone grafted and modified rGO, namely rGO-BP; the mass ratio of BP-OH to rGO is 1: 1 to 1: 20; the mass ratio of the potassium carbonate to the rGO is 1: 5 to 1: 20;
(2) preparing polylactic acid grafted modified reduced graphene oxide: mixing PLA and rGO-BP in a certain proportion in a solvent and uniformly dispersing; placing the dispersion liquid under an ultraviolet lamp for radiation grafting reaction for a certain time, centrifugally separating rGO, fully washing with a solvent to remove ungrafted PLA, and freeze-drying to obtain PLA grafted rGO (i.e. rGO-PLA); the molecular weight of the PLA is 10000-300000 g/mol; the mass ratio of the PLA to the rGO-BP is 1: 20 to 1: 1;
(3) preparing a modified reduced graphene oxide doped polylactic acid film: uniformly mixing and dispersing rGO-PLA and PLA into an organic solvent according to a certain proportion; preparing a film by volatilizing a solvent from the dispersion liquid by adopting a solution casting method, and carrying out vacuum treatment on the obtained film at 80 ℃ for a certain time to obtain a modified reduced graphene oxide doped polylactic acid film; the mass ratio of the rGO-PLA to the PLA is 1: 50 to 1: 5.
3. the preparation method of the modified reduced graphene oxide-doped polylactic acid film according to claim 2, wherein the preparation method comprises the following steps: the organic solvent in the step (1) is one of ethanol, n-propanol, isopropanol, ethylene glycol, acetonitrile, tetrahydrofuran and dioxane.
4. The preparation method of the modified reduced graphene oxide-doped polylactic acid film according to claim 2, wherein the preparation method comprises the following steps: the reflux reaction time in the step (1) is 4-12 hours.
5. The preparation method of the modified reduced graphene oxide-doped polylactic acid film according to claim 2, wherein the preparation method comprises the following steps: the solvent in the step (2) is water or an alcohol organic solvent capable of dissolving PLA.
6. The preparation method of the modified reduced graphene oxide-doped polylactic acid film according to claim 2, wherein the preparation method comprises the following steps: the radiation grafting reaction time in the step (2) is 5 to 60 minutes.
7. The preparation method of the modified reduced graphene oxide-doped polylactic acid film according to claim 2, wherein the preparation method comprises the following steps: the wavelength of the ultraviolet light in the step (2) is 365 nanometers.
8. The preparation method of the modified reduced graphene oxide-doped polylactic acid film according to claim 2, wherein the preparation method comprises the following steps: in the step (3), the organic solvent is one or a mixture of two of ethanol, isopropanol, n-propanol and glycol.
9. The preparation method of the modified reduced graphene oxide-doped polylactic acid film according to claim 2, wherein the preparation method comprises the following steps: the vacuum heat treatment time in the step (3) is 1 to 8 hours.
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Citations (10)
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