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High-temperature-resistant thermoplastic shape memory polyimide and preparation method thereof

A technology of polyimide and polyamic acid, which is applied in the field of polyimide and its preparation, can solve the problems of high temperature application, low glass transition temperature T, poor processing performance, thermal performance, mechanical performance and shape memory performance To achieve excellent thermodynamic effects, ensure stability, and excellent high and low temperature resistance

Active Publication Date: 2014-08-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the glass transition temperature T of existing shape memory polymers g Low processing performance, thermal properties, mechanical properties and shape memory properties are all poor, and cannot be used in high temperature fields, and a high temperature resistant thermoplastic shape memory polyimide and its preparation method are provided

Method used

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  • High-temperature-resistant thermoplastic shape memory polyimide and preparation method thereof
  • High-temperature-resistant thermoplastic shape memory polyimide and preparation method thereof
  • High-temperature-resistant thermoplastic shape memory polyimide and preparation method thereof

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specific Embodiment approach 1

[0039] Specific Embodiment 1: This embodiment is a high temperature resistant thermoplastic shape memory polyimide with 4,4'-(hexafluoroisopropylene) diphthalic anhydride and 4,4'-diaminodiphenyl ether as reactive monomers Prepared; the material ratio of the 4,4'-(hexafluoroisopropylene) diphthalic anhydride monomer to the 4,4'-diaminodiphenyl ether monomer is 1:1.

specific Embodiment approach 2

[0040] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the structural formula of a high temperature resistant thermoplastic shape memory polyimide is:

[0041]

[0042] Wherein, the range of n is 128-172. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0043] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the weight-average molecular weight of a high-temperature-resistant thermoplastic shape-memory polyimide is 77.8 kg / mol-104.6 kg / mol. Other steps are the same as in the second embodiment.

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Abstract

The invention discloses a high-temperature-resistant thermoplastic shape memory polyimide and a preparation method thereof and relates to a polyimide and a preparation method thereof. The invention aims to solve the problems of low glass transition temperature Tg, poor processing properties, thermal properties, mechanical properties and shape memory properties and inapplicability in the field of high temperature of the existing shape memory polymer. The high-temperature-resistant thermoplastic shape memory polyimide is prepared from 4,4'-(hexafluoroisopropylidene) diphthalic anhydride and 4,4'-diaminodiphenyl ether as reaction monomers and has a structural formula shown in the specification. The preparation method comprises the steps of firstly, dissolving the 4,4'-diaminodiphenyl ether monomer; secondly, preparing sol-gel polyamide acid; thirdly, removing residual bubbles; fourthly, carrying out thermal imidization; and fifthly, demoulding. The high-temperature-resistant thermoplastic shape memory polyimide is obtained by the method disclosed by the invention.

Description

technical field [0001] The invention relates to a polyimide and a preparation method thereof. Background technique [0002] Shape memory polymer (shape memory polymer, SMP) refers to a polymer material that has an initial shape, and after being deformed and fixed under certain conditions, it can sense and respond to external stimuli to restore its original state. Now various SMP materials such as shape memory polyurethane, shape memory polystyrene, and shape memory epoxy resin have been developed in various countries in the world [Nature, 2010, 464, 267-270.], which play an important role in many fields such as smart textiles, biomedicine, and aerospace. play an increasingly important role. Thermoplastic SMP has the advantages of easy processing and convenient use, and has excellent application and research prospects. For example, Hu et al. prepared shape memory fibers by using shape memory polyurethane, and the clothes made of these fibers have unique shape memory effect ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10
CPCC08G73/10
Inventor 冷劲松肖鑫礼刘彦菊孔德艳
Owner HARBIN INST OF TECH
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