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A kind of multiple shape memory polymer and preparation method thereof

A memory polymer, multiple technologies, applied in the field of chemically synthesized polymer materials, can solve the problems of limited application and single shape transition temperature, and achieve the effect of ensuring the recovery characteristics

Active Publication Date: 2022-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many types of shape memory polymers, but they are mainly concentrated on polymers with dual shape memory effects. Its shape transition temperature is single, and its application in many aspects will be limited.

Method used

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Examples

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Effect test

preparation example Construction

[0031]According to a second aspect of the present invention, the present invention provides a preparation method of multiple shape memory polymers, the preparation method comprising the following steps:

[0032] 1) Preparation of polybutylene terephthalate-co-polybutylene succinate copolyester: under an inert atmosphere, terephthalic acid, succinic acid, 1,4-butanediol and polyol 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;

[0033] 2) Preparation of polycaprolactone: in 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;

[0034] 3) Dissolve the polybutylene terephtha...

Embodiment 1

[0061] Terephthalic acid, succinic acid, 1,4-butanediol and pentaerythritol are added to the reactor, wherein the mol ratio of terephthalic acid and succinic acid is 20:80, and the mol ratio of diacid and diol is 1: 1.2, the addition amount of pentaerythritol is 0.2% of the mole number of diacid monomers, adding compound catalyst, 0.1 parts by weight (relative to 100 parts by weight succinic acid) of tetrabutyl titanate and 0.1 parts by weight of acetyl Lanthanum acetone (weight ratio to tetrabutyl titanate is 1:1), in an inert atmosphere, react at 140-240 ° C for 5 hours, until no more small molecular fractions are distilled; then, switch the reactor to Vacuum distillation device, heat up to 250℃, gradually adjust the vacuum degree of the system to be less than 90Pa, and react for 4 hours to obtain multi-arm polybutylene terephthalate-co-butylene succinate copolyester (PBTS) , the molecular weight is 13500g / mol.

[0062] Take pentaerythritol as the initiator, if the preset m...

Embodiment 2

[0066] The PBTS-b-PCL-based multiple shape memory polymer was prepared according to the method of Example 1, except that glycerol was used as the initiator in the PCL polyester, and the molecular weight was 8900 g / mol.

[0067] After testing, the multiple shape memory polymer is a quadruple shape memory polyester, which can hold three temporary shapes. The first transition temperature of the product (T trans,1 ) was 148°C, the shape fixation rate was 82%, and the shape recovery rate was 88%; the second transition temperature (T trans,2 ) was 89°C, the shape fixation rate was 91%, and the shape recovery rate was 87%; the third transition temperature (T trans,3) was 54°C, the shape fixation rate was 90%, and the shape recovery rate was 91%.

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Abstract

The invention belongs to the technical field of polymer materials for chemical synthesis, and discloses a multiple shape memory polymer, which is prepared by the following method: Butanediol diacid copolyester and polycaprolactone with a number average molecular weight of 5000-30000 are dissolved in a solvent, diisocyanate and a catalyst are added, and the first step is carried out to prepare a long-chain branched polyester star-shaped network structure. Add dihydric alcohol and diisocyanate, carry out the second step reaction, prepare polyurethane segments, and obtain multiple shape memory polymers; among the multiple shape memory polymers, polybutylene terephthalate-co-polybutylene succinate The weight ratio of the copolyester and polycaprolactone polyester matrix segment to the polyurethane segment is 60-90:10-40. The multiple shape memory polymer of the present invention has good multiple shape memory performance and biodegradation performance.

Description

technical field [0001] The invention belongs to the technical field of chemically synthesized polymer materials, and more particularly, relates to a multiple shape memory polymer and a preparation method thereof. Background technique [0002] Shape Memory Polymer (SMP for short) is a stimuli-responsive intelligent polymer material. Under the action of external stimuli (including heat, light, electricity, magnetism, solvent, etc.) Some preset deformations can be performed on it, and these deformations can be fixed or temporarily deformed under certain conditions. When the SMP with this temporary deformation is subjected to the corresponding external stimuli, it will respond and recover from the temporary shape to the initial shape, completing a shape memory cycle. This kind of shape memory polymer smart material can design its shape change and recovery according to the needs, and has great design flexibility. [0003] Most shape memory polymers are dual shape memory polymer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/42
CPCC08G18/4202C08G18/4219C08G18/4277C08G2280/00
Inventor 韩翎祝桂香张伟张韬毅宋建会许宁计文希
Owner CHINA PETROLEUM & CHEM CORP
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