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Shape memory random-copolymerized polyimide capable of being circularly used and preparation method thereof

A polyimide and random copolymerization technology, applied in the field of polyimide and its preparation, can solve the problems that shape memory polyimide cannot be recycled and the cost of shape memory polyimide is high

Active Publication Date: 2016-03-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the cost of the existing shape memory polyimide is high and the prepared shape memory polyimide cannot be recycled, and to provide a recyclable shape memory random copolymerization polyimide Amines and methods for their preparation

Method used

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  • Shape memory random-copolymerized polyimide capable of being circularly used and preparation method thereof
  • Shape memory random-copolymerized polyimide capable of being circularly used and preparation method thereof
  • Shape memory random-copolymerized polyimide capable of being circularly used and preparation method thereof

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specific Embodiment approach 1

[0032] Embodiment 1: This embodiment is a recyclable shape memory random copolymer polyimide composed of 1,3-bis(3-aminophenoxy)benzene and bisphenol A diether dianhydride and 4 , prepared from a mixture of 4-oxydiphthalic anhydride; the 1,3-bis(3-aminophenoxy)benzene and bisphenol A diether dianhydride and 4,4-oxydiphthalic anhydride The molar ratio of the mixture of phthalic anhydride is 1:1; In the mixture of bisphenol A type diether dianhydride and 4,4-oxydiphthalic anhydride, bisphenol A type diether dianhydride and 4 , The molar ratio of 4-oxydiphthalic anhydride is A:B, the value range of A is 1≤A≤9, and the value range of B is 1≤B≤9.

[0033] The positive effect that this implementation mode has:

[0034] 1. In this embodiment, 1,3-bis(3-aminophenoxy)benzene is used as the diamine monomer, and a mixture of bisphenol A diether dianhydride and 4,4-oxydiphthalic anhydride is used as the diamine monomer. Dianhydride monomer to prepare recyclable random copolymerized shap...

specific Embodiment approach 2

[0040] Specific embodiment two: This embodiment is a preparation method of recyclable shape-memory random copolymerized polyimide is completed according to the following steps:

[0041] 1. Add 1,3-bis(3-aminophenoxy)benzene into the aprotic polar solvent, and then stir it under a dry nitrogen atmosphere until the 1,3-bis(3-aminophenoxy)benzene is completely Dissolving to obtain diamine solution;

[0042] The volume ratio of the amount of 1,3-bis(3-aminophenoxy)benzene described in step 1 to the aprotic polar solvent is 0.05mol:(80mL~130mL);

[0043] 2. Dissolving the mixture of bisphenol A type diether dianhydride and 4,4-oxydiphthalic anhydride in an aprotic polar solvent to obtain a dianhydride solution;

[0044] In the mixture of bisphenol A type diether dianhydride and 4,4-oxydiphthalic anhydride described in step 2, the mixture of bisphenol A type diether dianhydride and 4,4-oxydiphthalic anhydride The molar ratio is A:B, the value range of A is 1≤A≤9, and the value ran...

specific Embodiment approach 3

[0050] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the aprotic polar solvent described in step one is N,N-dimethylformamide, N,N-dimethylacetamide or N-Methylpyrrolidone. Other steps are the same as in the second embodiment.

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Abstract

The invention discloses a shape memory random-copolymerized polyimide capable of being circularly used and a preparation method thereof, relates to polyimide and a preparation method thereof, and aims to solve the problems that in the prior art, the preparation cost of shape memory polyimide is high, and the prepared shape memory polyimide cannot be repeatedly used. The provided polyimide is prepared from a mixture of 1,3-bis(3-aminophenoxyl)benzene, 4,4'-(4,4'-isopropylidenediphenoxy)bis(phthalic anhydride), and 4,4'-oxydiphthalic anhydride. The preparation method comprises the following steps: step one, preparing a diamine solution; step two, preparing a dianhydride solution; step three, preparing a polyamide acid solution; step four, carrying out thermal imidization to obtain a glass plate containing polyimide; step five, cleaning and drying to obtain the shape memory random-copolymerized polyimide capable of being circularly used. The provided method can obtain shape memory random-copolymerized polyimide capable of being circularly used.

Description

technical field [0001] The invention relates to a polyimide and a preparation method thereof. Background technique [0002] Shape memory polymers (shape memory polymers, SMPs) are a class of smart polymer materials that can memorize temporary shapes and return to their original shapes under external stimuli. Compared with shape memory metal alloys, SMP has the advantages of large reversible strain, low density, easy processing, and easy control of shape recovery temperature. Polyimide (PI) has the advantages of high thermal stability, excellent mechanical properties, and diverse processing methods, and has been widely used in automotive, microelectronics, optoelectronics, aerospace and other fields. Shape memory polyimide also has important application value in space deployment structure, variable aircraft aileron, high temperature sensor and driver. [0003] The cost of shape-memory polyimide is relatively high, so the recyclable use of shape-memory polyimide has high app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10
CPCC08G73/1071
Inventor 肖鑫礼孔德艳
Owner HARBIN INST OF TECH
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