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A kind of triple shape memory polymer and preparation method thereof

A technology of memory polymers and poly pairs, which is applied in the field of triple shape memory polymers and its preparation, can solve the problems of polycaprolactone with low molecular weight, poor toughness and biodegradability, and high cross-linking density, and achieve good biological Degradability, good triple shape memory effect, effect of expanding application range

Active Publication Date: 2022-07-12
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 an inert atmosphere, terephthalic acid, succinic acid, 1,4-butanediol and The reaction is carried out under the action of a catalyst until no small molecular fractions are distilled out, and then the reaction is carried out under the condition of vacuum distillation to obtain polybutylene terephthalate-co-polybutylene succinate with a number-average molecular weight of 6000-30000. Glycol copolyester;

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

[0032] 3) dissolving the polybutylene terephthalate...

Embodiment 1

[0056] Terephthalic acid, succinic acid, 1,4-butanediol and pentaerythritol are added in the reactor, wherein the mol ratio of terephthalic acid and succinic acid is 20:80, dibasic acid (terephthalic acid and succinic acid) and the mol ratio of dihydric alcohol (1,4-butanediol) are 1: 1.2, the addition of pentaerythritol is 0.2% of the mole number of dibasic acid monomer, add compound catalyst, 0.1 parts by weight ( Relative to 100 parts by weight of succinic acid) of tetrabutyl titanate and 0.1 part by weight of lanthanum acetylacetonate (1:1 weight ratio to tetrabutyl titanate), in an inert atmosphere, at 140-240 ° C React for 5 hours, until there is no more small molecular fraction to steam out; then, the reactor is switched to a vacuum distillation device, the temperature is raised to 250 ° C, and the vacuum degree of the system is gradually adjusted to be less than 90PaA, and the reaction is performed for 4 hours to obtain a multi-arm polymer. Butylene terephthalate-co-bu...

Embodiment 2

[0061] The PBTS-b-PCL triple shape memory polymer was prepared according to the method of Example 1, except that the molar ratio of terephthalic acid and succinic acid in the PBTS polyester was 10:90, and the added amount of pentaerythritol was binary 0.1% of the moles of acid monomers, and the polycondensation reaction time is 6 hours to obtain multi-arm PBTS.

[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 ) was 60°C, the shape fixation rate was 97%, and the shape recovery rate was 95%.

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Abstract

The invention belongs to the technical field of chemically synthesized 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, The triple shape memory polymer is obtained by reaction; the number-average molecular weight of the polybutylene terephthalate-co-polybutylene succinate copolyester is 6000-30000; the number-average molecular weight of the polycaprolactone The average molecular weight is 5000‑30000. The triple shape memory polymer of the present 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 particularly relates to a triple shape memory polymer and a preparation method thereof. Background technique [0002] Shape Memory Polymer (SMP for short) is a stimuli-responsive smart material that can be given a temporary shape under the action of a certain temperature and external force, and then under external stimulation conditions (including heat, light, electricity, magnetism, etc.) , solvent, etc.) from the temporary shape 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, and easy forming and processing, and has great development prospects. [0003] From the point of view of molecular structure, SMPs have shape memory properties and need to have both a stationary phase and a reversible transition phase. The stationary phase is...

Claims

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Application Information

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Patent Type & Authority Patents(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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