CN110305303A - A kind of preparation method of degradable biological base polyester of the side chain containing double bond functional group - Google Patents

A kind of preparation method of degradable biological base polyester of the side chain containing double bond functional group Download PDF

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CN110305303A
CN110305303A CN201910669460.6A CN201910669460A CN110305303A CN 110305303 A CN110305303 A CN 110305303A CN 201910669460 A CN201910669460 A CN 201910669460A CN 110305303 A CN110305303 A CN 110305303A
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methylene
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butyrolactone
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沈勇
李志波
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Qingdao University of Science and Technology
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    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/06Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids
    • C08G63/08Lactones or lactides
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78Preparation processes
    • C08G63/82Preparation processes characterised by the catalyst used
    • C08G63/823Preparation processes characterised by the catalyst used for the preparation of polylactones or polylactides
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78Preparation processes
    • C08G63/82Preparation processes characterised by the catalyst used
    • C08G63/83Alkali metals, alkaline earth metals, beryllium, magnesium, copper, silver, gold, zinc, cadmium, mercury, manganese, or compounds thereof
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    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78Preparation processes
    • C08G63/82Preparation processes characterised by the catalyst used
    • C08G63/87Non-metals or inter-compounds thereof
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    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2230/00Compositions for preparing biodegradable polymers

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Abstract

The present invention provides a kind of polymerization of alpha-methylene-gamma-butyrolactone selective opening, the method for preparing poly- (alpha-methylene-gamma-butyrolactone).The ring-opening polymerisation for the binary catalyst system catalysis alpha-methylene-gamma-butyrolactone that the present invention is formed using highly basic and co-catalyst.Method provided by the invention is compared with previously reported method, with following usefulness: 1) highly basic used in and co-catalyst toxicity are low, and it is easy to remove from product, experiments have shown that products therefrom can be used in biomedicine field without obvious cytotoxicity;2) selectivity of catalyst system used in is high, can be realized the selective opening polymerization of alpha-methylene-gamma-butyrolactone, completely retains double bond functional group, and gained polyester product can regulate and control its physicochemical properties by rear modification.

Description

A kind of preparation method of degradable biological base polyester of the side chain containing double bond functional group
Technical field
The present invention relates to high molecular material and chemical fields, in particular it relates to a kind of poly- (alpha-methylene- Gamma-butyrolacton) preparation method.
Background technique
Due to petroleum resources it is continuous consumption and environmental pollution is getting worse, renewable polymeric materials are in recent years Receive the extensive concern of academia and industry.Common renewable polymeric materials include polycaprolactone, polylactic acid, poly- second Alkyd, polyhydroxyalkanoate etc..Although these renewable polymeric materials, can also be with using natural reproducible biomass as raw material It degrades in a natural environment, but its degradation generally produces carbon dioxide and water, recycling and reusing can not be carried out to raw material, be pair The significant wastage of resource.
Solve the problems, such as a kind of means that high molecular material recycles for the recyclable high molecular material of preparation chemistry.Chemistry can Recycling high molecular material refers to the height that monomer degradable can be obtained under relatively mild reaction condition and lower energy consumption condition Molecular material.It is still less for the research of this kind of high molecular material at present, this kind of only poly- (γ-fourth of material reported in the literature Lactone), poly- (trans- hexahydro benzofuran -1 (3H) ketone), poly- (alpha-methylene-gamma-butyrolactone), derived from 4- hydroxy-proline Several (Nat.Chem.2016,8,42-49 of polysulfide lactones;Science 2018,360,398-403; J.Am.Chem.Soc.2016,138,14326-14337;J.Am.Chem.Soc.2019,141,4928-4935).Wherein, gather (alpha-methylene-gamma-butyrolactone) is a kind of important polyester material.Monomer alpha-methylene-gamma-butyrolactone is also referred to as Radix Curcumae Fragrant spirit A, mass production can obtain from biomass material.On the other hand, compared with existing common polyester material, poly- (α-Asia Methyl-gamma-butyrolactone) other than with degradable polyester backbone structure, side chain contains double bond functional group, repairs after can passing through The method of decorations is modified it, regulates and controls physicochemical properties.However, most of document only reports alpha-methylene-γ-at present Butyrolactone obtains the polymer that main chain is carbon-carbon bond by double bond sudden reaction, and only document report is poly- by open loop The method of conjunction be prepared main chain be ester bond poly- (alpha-methylene-gamma-butyrolactone) (J.Am.Chem.Soc.2016,138, 14326-14337).Lanthanum or yttrium metal complex catalysts have been used in this method.However, transition-metal catalyst is poly- Residual in ester products will cause stronger bio-toxicity, to its biomedicine field application be unfavorable.
In view of this, realizing α-methylene the present invention provides the binary catalyst system that a kind of highly basic and co-catalyst form Base-gamma-butyrolacton selective opening polymerization, prepares the new method of poly- (alpha-methylene-gamma-butyrolactone).Side provided by the invention Method is compared with previously reported method, and have following usefulness: 1) highly basic used in and co-catalyst bio-toxicity are low, and And be easy to remove from product, experiments have shown that products therefrom can be used in biomedicine field without obvious cytotoxicity;2) used Catalyst system selectivity is high, can be realized the selective opening polymerization of alpha-methylene-gamma-butyrolactone, complete to retain double bond function Group, gained polyester product can regulate and control its physicochemical properties by rear modification.
Summary of the invention
The object of the present invention is to provide a kind of polymerizations of alpha-methylene-gamma-butyrolactone selective opening, prepare poly- (α-methylene Base-gamma-butyrolacton) method, include the following steps:
(1) initiator, highly basic and co-catalyst are dissolved in organic solvent, at low temperature stirring a period of time;
(2) alpha-methylene-gamma-butyrolactone is added in above-mentioned mixed solution, at a certain temperature reaction a period of time, is added Enter acidic materials and terminate reaction, precipitating in methanol is added in reaction mixture and obtains poly- (alpha-methylene-gamma-butyrolactone).
In above-mentioned preparation method, shown in the chemical structural formula such as formula (I) of poly- (alpha-methylene-gamma-butyrolactone):
It is characterized in that, n is the natural number more than or equal to 5, R1For hydroxyl, alkoxy or alkoxy aryl, concretely Hydroxyl, methoxyl group, ethyoxyl, isopropoxy, tert-butoxy, benzyloxy, phenyl ethoxy, phenyl-propoxy, diphenyl methoxy Base, 2,2- hexichol base oxethyl.
In above-mentioned preparation method, the co-catalyst is at least one of urea or thiocarbamide, and wherein urea is shown in formula (II) Compound, thiocarbamide are compound shown in formula (III), R3And R4Be respectively and independently selected from alkyl or aryl, specifically may respectively be methyl, Ethyl, propyl, isopropyl, cyclohexyl, phenyl, 4- chlorphenyl, 4- methoxyphenyl, 4- trifluoromethyl, the bis- (trifluoros of 3,5- Methyl) phenyl, 2,6- 3,5-dimethylphenyl, 2,4- Dimethoxyphenyl, 2,4,6- trimethoxyphenyl.
According to an embodiment of the invention, the urea or thiocarbamide have one of following structure:
In above-mentioned preparation method, initiator described in step (1) is alcohol, concretely methanol, ethyl alcohol, isopropanol, tertiary fourth Alcohol, benzylalcohol, benzyl carbinol, phenylpropanol, benzohydrol, 2,2- diphenyl ethyl alcohol, ethylene glycol, 1,4- phenyl dimethanol, glycerine, Pentaerythrite;The highly basic can be alkali metal, alkali metal compound or organic phosphonitrile base catalyst, concretely sodium, potassium, hydrogenation Potassium, sodium hydride, six [three (dimethyl amine) phosphorus nitrence] tripolyphosphazene ({ [(NMe2)3P=N]2P=N }3), phosphonitrile ligand uncle P4- Butyl ([(NMe2)3P=N]3P=NtBu, tert-Bu-P4), phosphonitrile ligand P2- tert-butyl ([(NMe2)3P=N] (NMe2)2P= NtBu, tert-Bu-P2);The molar ratio of the highly basic and initiator is 1/3~20/1;The molar ratio of the highly basic and urea It is 1/1~1/10.
In above-mentioned preparation method, low temperature described in step (1) is -70~-10 DEG C;The mixing time be 10min extremely 30min;The organic solvent can be toluene, tetrahydrofuran, methylene chloride, acetonitrile, N,N-dimethylformamide.
In above-mentioned preparation method, reaction temperature described in step (2) is -70~-20 DEG C;The reaction time be 0.5~ 48h, molar concentration of the alpha-methylene-gamma-butyrolactone in system are 4~11mol/L, the initiator and α-methylene Base-gamma-butyrolacton molar ratio is 1/10~1/3000.
In above-mentioned preparation method, the acidic materials are acetic acid, benzoic acid, hydrochloric acid, sulfuric acid, phosphoric acid, the acidic materials Molar ratio with highly basic is 1/1~10/1.
Detailed description of the invention
Fig. 1 is alpha-methylene-gamma-butyrolactone polyaddition products obtained in comparative example 11H NMR spectra.
Fig. 2 is poly- (alpha-methylene-gamma-butyrolactone) obtained in embodiment 11H NMR spectra.
Fig. 3 is poly- (alpha-methylene-gamma-butyrolactone) obtained in embodiment 113C NMR spectra.
Fig. 4 is the GPC spectrogram of poly- (alpha-methylene-gamma-butyrolactone) made from embodiment 1 to embodiment 4.
It is 10 DEG C/min that Fig. 5, which is (alpha-methylene-gamma-butyrolactone) poly- made from embodiment 1 to embodiment 4 in sweep speed, When
DSC spectrogram.
Fig. 6 is poly- (alpha-methylene-gamma-butyrolactone) obtained in embodiment 51H NMR spectra.
Fig. 7 is poly- (alpha-methylene-gamma-butyrolactone) obtained in embodiment 61H NMR spectra.
Fig. 8 is poly- (alpha-methylene-gamma-butyrolactone) obtained in embodiment 71H NMR spectra.
Specific embodiment
The present invention is specifically described in following case study on implementation, but the present invention is not restricted to these case study on implementation.
Material used in following case study on implementation, reagent etc., are commercially available unless otherwise specified.
Comparative example 1
By (0.05mmol, 5.41mg) benzylalcohol, (0.05mmol, 59.9mg) six [three (dimethyl amine) phosphorus nitrence] trimerization phosphorus Nitrile is dissolved in 0.187mL tetrahydrofuran, is placed in -50 DEG C of low temperature cryostats and is stirred 10min, with syringe by (5mmol, 0.44mL) Alpha-methylene-gamma-butyrolactone is added in reaction tube.Reaction carries out 4h under nitrogen protection, and 10 drop acetic acid are added and terminate reaction.It will Reaction mixture is dissolved in 1mL n,N-Dimethylformamide, is poured into 10mL methanol, and centrifuge separation precipitating obtains polymer, core Magnetic characterizes all double bond addition products of polymer, and nucleus magnetic hydrogen spectrum is as shown in Figure 1.
Embodiment 1
(0.05mmol, 5.41mg) benzylalcohol, (0.05mmol, 59.9mg) six [three (dimethyl amine) phosphorus nitrence] trimerization phosphorus Nitrile, (0.15mmol, 42.95mg) 1- cyclohexyl -3- (4- trifluoromethyl) urea are dissolved in 0.187mL tetrahydrofuran, be placed in - 10min is stirred in 50 DEG C of low temperature cryostats, reaction tube is added in (5mmol, 0.44mL) alpha-methylene-gamma-butyrolactone with syringe In.Reaction carries out 4h under -50 DEG C of nitrogen protections, and 10 drop acetic acid are added and terminate reaction.Reaction mixture is dissolved in 3mL chloroform In, it pours into 10mL methanol, centrifuge separation precipitating obtains polymer, and it is ring opening polymerization product, i.e., poly- (α-that nuclear-magnetism, which characterizes polymer, Methylene-y-butyrolactone), nucleus magnetic hydrogen spectrum is as shown in Fig. 2, nuclear-magnetism carbon spectrum such as Fig. 3 is indicated.GPC measures number-average molecular weight 5.9kg/mol, molecular weight distribution 1.29, GPC spectrogram is as shown in figure 4, DSC spectrogram is as shown in Figure 5.With 1 phase of comparative example Compare, obtain being double bond polyaddition products when urea is not added, and urea is added to obtain being ring opening polymerization product later.
Embodiment 2
(0.05mmol, 5.41mg) benzylalcohol, (0.05mmol, 31.7mg) phosphonitrile ligand P4- tert-butyl catalyst, (0.15mmol, 42.95mg) 1- cyclohexyl -3- (3,5- bis- (trifluoromethyl) phenyl) urea is dissolved in 0.187mL tetrahydrofuran, sets 10min is stirred in -60 DEG C of low temperature cryostats, (7.5mmol, 0.66mL) alpha-methylene-gamma-butyrolactone is added instead with syringe Ying Guanzhong.Reaction carries out 4h under -60 DEG C of nitrogen protections, and 10mg benzoic acid is added and terminates reaction.Reaction mixture is dissolved in It in 10mL chloroform, pours into 30mL methanol, centrifuge separation precipitating obtains polymer, and nuclear-magnetism characterizes polymer as ring-opening polymerisation production Object, i.e., it is poly- (alpha-methylene-gamma-butyrolactone), GPC measure number-average molecular weight be 10.5kg/mol, molecular weight distribution 1.35, GPC spectrogram is as shown in figure 4, DSC spectrogram is as shown in Figure 5.
Embodiment 3
By (0.4mmol, 54.5mg) phenylpropanol, (1.6mmol, 588mg) phosphonitrile ligand P2- tert-butyl, (6.4mmol, 1.36g) 1,3- diphenyl urea and 3mL tetrahydrofuran are added in reaction tube, are placed in -50 DEG C of low temperature cryostats and stir 10min, with note (80mmol, 7mL) alpha-methylene-gamma-butyrolactone is added in reaction tube emitter.Reaction carries out under -50 DEG C of nitrogen protections 12h is added 1mL hydrochloric acid and terminates reaction.Reaction mixture is dissolved in 50mL methylene chloride, is poured into 200mL methanol, centrifugation point Polymer is obtained from precipitating, it is ring opening polymerization product that nuclear-magnetism, which characterizes polymer, i.e., poly- (alpha-methylene-gamma-butyrolactone), GPC is surveyed Number average molecular weight is 15.5kg/mol, and molecular weight distribution 1.31, GPC spectrogram is as shown in figure 4, DSC spectrogram is as shown in Figure 5.
Embodiment 4
By (0.5mmol, 69mg) Isosorbide-5-Nitrae-phenyl dimethanol, (0.75mmol, 30mg) hydrofining, (1.5mmol, 360.6mg) 1,3- dicyclohexyl thiourea and 2mL tetrahydrofuran are added in reaction tube, are placed in -40 DEG C of low temperature cryostats and stir (150mmol, 13.2mL) alpha-methylene-gamma-butyrolactone is added in reaction tube with syringe by 10min.Reaction is in -40 DEG C of nitrogen 8h is carried out under gas shielded, and 5mL hydrochloric acid is added and terminates reaction.Reaction mixture is dissolved in 50mL methylene chloride, 200mL first is poured into In alcohol, centrifuge separation precipitating obtains polymer, and it is ring opening polymerization product, i.e., poly- (alpha-methylene-γ-fourth that nuclear-magnetism, which characterizes polymer, Lactone), it is 25.5kg/mol that GPC, which measures number-average molecular weight, and molecular weight distribution 1.29, GPC spectrogram is as shown in figure 4, DSC spectrogram As shown in Figure 5.
Embodiment 5
By (0.05mmol, 3.51mg) potassium methoxide, (0.15mmol, 21.6mg) 1,3- diisopropyl urea and 0.187mL second Nitrile is added in reaction tube, is placed in -40 DEG C of low temperature cryostats and stirs 10min, with syringe by (5mmol, 0.44mL) alpha-methylene - Gamma-butyrolacton is added in reaction tube.Reaction carries out 2h under -40 DEG C of nitrogen protections, and 1mL hydrochloric acid is added and terminates reaction.It will reaction Mixture is dissolved in 10mL methylene chloride, is poured into 50mL methanol, and centrifuge separation precipitating obtains polymer, and nuclear-magnetism characterizes polymer For ring opening polymerization product, i.e., poly- (alpha-methylene-gamma-butyrolactone), it is 6.6kg/mol, molecular weight point that GPC, which measures number-average molecular weight, Cloth is 1.05, and nucleus magnetic hydrogen spectrum is as shown in Figure 6.
Embodiment 6
By (0.05mmol, 9.21mg) benzohydrol, (0.1mmol, 2.3mg) sodium and (0.3mmol, 84.1mg) 1- benzene Base -3- (4- trifluoromethyl) urea, 0.2mL n,N-Dimethylformamide are added in reaction tube, are placed in -40 DEG C of low temperature cryostats (5mmol, 0.44mL) alpha-methylene-gamma-butyrolactone is added in reaction tube with syringe by middle stirring 10min.Reaction is -40 It carries out for 24 hours, 1mL sulfuric acid being added and terminates reaction under DEG C nitrogen protection.Reaction mixture is dissolved in 10mL methylene chloride, is poured into In 50mL methanol, centrifuge separation precipitating obtains polymer, and it is ring opening polymerization product, i.e., poly- (alpha-methylene-that nuclear-magnetism, which characterizes polymer, Gamma-butyrolacton), it is 8.6kg/mol that GPC, which measures number-average molecular weight, and molecular weight distribution 1.15, nucleus magnetic hydrogen spectrum is as shown in Figure 7.
Embodiment 7
(0.5mmol, 30mg) isopropanol, (0.5mmol, 600mg) six [three (dimethyl amine) phosphorus nitrence] tripolyphosphazene, (1.5mmol, 429.5mg) 1- cyclohexyl -3- (4- trifluoromethyl) urea is dissolved in 1.87mL tetrahydrofuran, is placed in -50 DEG C 10min is stirred in low temperature cryostat, (50mmol, 4.4mL) alpha-methylene-gamma-butyrolactone is added in reaction tube with syringe.Instead 6h should be carried out under -50 DEG C of nitrogen protections, and 5mL sulfuric acid is added and terminates reaction.Reaction mixture is dissolved in 20mL chloroform, is poured into In 100mL methanol, centrifuge separation precipitating obtains polymer, and it is ring opening polymerization product, i.e., poly- (α-methylene that nuclear-magnetism, which characterizes polymer, Base-gamma-butyrolacton), nucleus magnetic hydrogen spectrum is as shown in Figure 8.It is 5.4kg/mol that GPC, which measures number-average molecular weight, and molecular weight distribution is 1.28。
Embodiment 8
(0.1mmol, 10.8mg) benzylalcohol, (0.1mmol, 63.4mg) phosphonitrile ligand P4- tert-butyl catalyst, (0.3mmol, 70.3mg) 1- cyclohexyl -3- phenylthiourea is dissolved in 0.187mL tetrahydrofuran, is placed in -60 DEG C of low temperature cryostats 10min is stirred, (300mmol, 26.3mL) alpha-methylene-gamma-butyrolactone is added in reaction tube with syringe.Reaction is -60 48h is carried out under DEG C nitrogen protection, and 1mL phosphoric acid is added and terminates reaction.Reaction mixture is dissolved in 100mL chloroform, 500mL is poured into In methanol, centrifuge separation precipitating obtains polymer, and it is ring opening polymerization product, i.e., poly- (alpha-methylene-γ-that nuclear-magnetism, which characterizes polymer, Butyrolactone), it is 254kg/mol, molecular weight distribution 1.80 that GPC, which measures number-average molecular weight,.

Claims (7)

1. a kind of alpha-methylene-gamma-butyrolactone selective opening polymerization, the method for preparing poly- (alpha-methylene-gamma-butyrolactone), Include the following steps:
(1) initiator, highly basic and co-catalyst are dissolved in organic solvent, at low temperature stirring a period of time;
(2) alpha-methylene-gamma-butyrolactone is added in above-mentioned mixed solution, at a certain temperature reaction a period of time, acid is added Property substance terminate reaction, by reaction mixture be added methanol in precipitating obtain poly- (alpha-methylene-gamma-butyrolactone).
2. the method according to claim 1, wherein the chemical structure of poly- (alpha-methylene-gamma-butyrolactone) Shown in formula such as formula (I):
It is characterized in that, n is the natural number more than or equal to 5, R1Selected from hydroxyl, methoxyl group, ethyoxyl, isopropoxy, tertiary fourth oxygen Base, benzyloxy, phenyl ethoxy, phenyl-propoxy, diphenylmethyl oxygroup, 2,2- hexichol base oxethyl.
3. according to the method described in claim 1, it is characterized by:
The co-catalyst is at least one of urea or thiocarbamide, and wherein urea is compound shown in formula (II), and thiocarbamide is formula (III) institute Show compound, R2And R3It is respectively and independently selected from alkyl or aryl, preferably methyl, ethyl, propyl, isopropyl, cyclohexyl, phenyl, 4- Bis- (trifluoromethyl) phenyl of chlorphenyl, 4- methoxyphenyl, 4- trifluoromethyl, 3,5-, 2,6- 3,5-dimethylphenyl, 2,4- bis- Methoxyphenyl, 2,4,6- trimethoxyphenyl.
4. urea according to claim 3 or thiocarbamide, which is characterized in that with one of following structure:
5. according to the method described in claim 1, it is characterized by:
The initiator be alcohol, preferably methanol, ethyl alcohol, isopropanol, the tert-butyl alcohol, benzylalcohol, benzyl carbinol, phenylpropanol, benzohydrol, 2,2- diphenyl ethyl alcohol, ethylene glycol, 1,4- phenyl dimethanol, glycerine, pentaerythrite;The highly basic is selected from alkali metal, alkali gold Belong to compound or organic phosphazene base.
Optionally, the alkali metal is selected from sodium or potassium, and the alkali metal compound is selected from hydrofining, sodium hydride, described organic phosphorus Nitrile alkali is selected from six [three (dimethyl amine) phosphorus nitrence] tripolyphosphazene ({ [(NMe2)3P=N]2P=N }3), the tertiary fourth of phosphonitrile ligand P4- Base ([(NMe2)3P=N]3P=NtBu, tert-Bu-P4), phosphonitrile ligand P2- tert-butyl ([(NMe2)3P=N] (NMe2)2P= NtBu, tert-Bu-P2);
The acidic materials are at least one of acetic acid, benzoic acid, hydrochloric acid, sulfuric acid or phosphoric acid.
6. according to the method described in claim 1, it is characterized by:
The molar ratio of the highly basic and initiator is 1/3~20/1;The molar ratio of the highly basic and urea is 1/1~1/10; The molar ratio of the initiator and alpha-methylene-gamma-butyrolactone is 1/10~1/3000;The acidic materials and highly basic rub Your ratio is 1/1~10/1.
7. according to the method described in claim 1, it is characterized by:
Described a period of time of stirring at low temperature refers to 10~30min of stirring at -70~-10 DEG C;The organic solvent is selected from Toluene, tetrahydrofuran, methylene chloride, acetonitrile, N,N-dimethylformamide;The reaction temperature is -70~-20 DEG C;It is described anti- It is 0.5~48h between seasonable;Molar concentration of the alpha-methylene-gamma-butyrolactone in system is 4~11mol/L.
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CN110982053A (en) * 2019-12-19 2020-04-10 杭州师范大学 Organic nonmetal catalyst for preparing poly (p-dioxanone)
CN111253556A (en) * 2020-03-20 2020-06-09 南京工业大学 Functionalized recyclable high-molecular homopolymer and preparation method and application thereof
CN113501946A (en) * 2021-08-04 2021-10-15 南京先进生物材料与过程装备研究院有限公司 Method for synthesizing proline-based polymer
CN114349939A (en) * 2021-12-27 2022-04-15 青岛科技大学 Rapid preparation method of recyclable bio-based polyester
CN114369232A (en) * 2022-01-26 2022-04-19 青岛科技大学 Renewable degradable thermoplastic elastomer and preparation method thereof

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