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Triple shape memory polymer and preparation method thereof

A technology of memory polymer and polypair, applied in the field of triple shape memory polymer and its preparation, can solve the problems of low molecular weight of polycaprolactone, poor toughness and biodegradability, high crosslinking density, etc.

Active Publication Date: 2021-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent document CN108586693A is to mix low-molecular-weight polycaprolactone (molecular weight at 1000-3000) with a monomer with hindered amine groups and a trifunctional cross-linking agent with three isocyanate groups in a solvent and then pour it into a mold and heat it directly Cured into a shape memory polymer, due to the low molecular weight of polycaprolactone and high crosslinking density, although there is dynamic construction, the toughness and biodegradability will deteriorate

Method used

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preparation example Construction

[0029] According to a second aspect of the present invention, the present invention provides a preparation method of a triple shape memory polymer, the preparation method comprising the following steps:

[0030]1) Preparation of polybutylene terephthalate-co-polybutylene succinate copolyester: under inert atmosphere, terephthalic acid, succinic acid, 1,4-butanediol and polyol React under the action of a catalyst until no small molecular fractions are distilled out, and then react under reduced pressure distillation conditions to obtain polybutylene terephthalate-co-polybutylene succinate with a number average molecular weight of 6000-30000 Diol copolyester;

[0031] 2) Preparation of polycaprolactone: under an inert atmosphere, the caprolactone monomer reacts under the action of an initiator and a catalyst to obtain polycaprolactone with a number average molecular weight of 5000-30000;

[0032] 3) Dissolving the polybutylene terephthalate-co-polybutylene succinate copolyester...

Embodiment 1

[0056] Terephthalic acid, succinic acid, 1,4-butanediol and pentaerythritol are added in the reactor, wherein the molar ratio of terephthalic acid and succinic acid is 20:80, dibasic acid (terephthalic acid and Succinic acid) and the mol ratio of dibasic alcohol (1,4-butanediol) is 1: 1.2, and the add-on of pentaerythritol is 0.2% of dibasic acid monomer mole number, adds composite catalyst, 0.1 weight part ( With respect to 100 parts by weight of tetrabutyl titanate (succinic acid) and 0.1 parts by weight of lanthanum acetylacetonate (the weight ratio to tetrabutyl titanate is 1:1), under an inert atmosphere, at 140-240 ° C React for 5 hours until no small molecular fractions are distilled out; then, switch the reaction kettle to a vacuum distillation device, heat up to 250° C., gradually adjust the vacuum of the system to be less than 90 PaA, and react for 4 hours to obtain a multi-arm polymer Butylene terephthalate-co-butylene succinate copolyester (PBTS) with a molecular w...

Embodiment 2

[0061] Prepare PBTS-b-PCL triple shape memory polymer according to the method of Example 1, the difference is that the molar ratio of terephthalic acid and succinic acid in the PBTS polyester is 10:90, and the addition amount of pentaerythritol is binary 0.1% of the molar amount of the acid monomer, the polycondensation reaction time is 6 hours, and the multi-arm PBTS is obtained.

[0062] After testing, the first transition temperature of the product (T trans，1 ) is 100°C, the shape fixation rate is 95%, the shape recovery rate is 93%, and the second transition temperature (T trans，2 ) is 60°C, the shape fixation rate is 97%, and the shape recovery rate is 95%.

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Abstract

The invention belongs to the technical field of chemically synthesized high polymer materials, and discloses a triple shape memory polymer and a preparation method thereof. The triple shape memory polymer is prepared by the following method: dissolving polybutylene terephthalate-co-polybutylene succinate copolyester and polycaprolactone in a solvent, adding diisocyanate and a catalyst, and reacting to obtain the triple shape memory polymer, wherein the number-average molecular weight of the polybutylene terephthalate-co-poly (butylene succinate) copolyester is 6000 to 30000, and the number average molecular weight of the polycaprolactone is in a range of 5000 to 30000. The triple shape memory polymer disclosed by the invention has good triple shape memory performance and biodegradability.

Description

technical field [0001] The invention belongs to the technical field of chemically synthesized polymer materials, and more specifically relates to a triple shape memory polymer and a preparation method thereof. Background technique [0002] Shape memory polymer (Shape Memory Polymer, referred to as SMP) is a stimulus-responsive smart material, which can be endowed with a temporary shape under a certain temperature and external force, and then under external stimulus conditions (including heat, light, electricity, magnetism, etc.) , solvent, etc.) from the temporary shape back to the initial shape, completing a shape memory cycle. Compared with shape memory alloys, SMP has the advantages of light weight, fast recovery, mild recovery conditions, easy forming and processing, etc., and has great development prospects. [0003] From the perspective of molecular structure, SMP has shape memory properties and needs to have both a stationary phase and a reversible transformation pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42
CPCC08G18/4277C08G18/4213C08G2280/00C08G2230/00
Inventor 韩翎张韬毅祝桂香张伟许宁宋建会计文希林蔚然
Owner CHINA PETROLEUM & CHEM CORP
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