Shape memory polyimide prepared by virtue of chemical imidization and preparation method thereof

A chemical imide and polyimide technology, applied in the field of smart material shape memory polymers, to achieve the effects of ensuring stability, excellent processability, and excellent thermodynamic effects

Active Publication Date: 2014-08-13
冷劲松
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the preparation of thermoplastic shape memory polyimide by chemical imidization at home and abroad.

Method used

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  • Shape memory polyimide prepared by virtue of chemical imidization and preparation method thereof
  • Shape memory polyimide prepared by virtue of chemical imidization and preparation method thereof
  • Shape memory polyimide prepared by virtue of chemical imidization and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1: Add 25ml of N,N-dimethylacetamide into a three-necked flask with nitrogen protection and mechanical stirring, weigh 6mmol of 4,4'-diaminodiphenyl ether monomer into it, and dry it under nitrogen Stir at room temperature for 28 minutes until completely dissolved.

[0035] Step 2: Weigh the bisphenol A type diether dianhydride monomer with the amount of diaminodiphenyl ether diamine monomer and other substances, and add it to the above solution in 4 times, and the amount of the latter addition is less than or equal to the previous one half; after the addition was complete, it was stirred at room temperature for 16 hours to obtain polyamic acid.

[0036] Its chemical reaction equation is shown in formula (1):

[0037]

[0038] Step 3: adding acetic anhydride, triethylamine, and pyridine to the polyamic acid; the concentration of acetic anhydride is 0.8mol / L; the concentration of triethylamine is 0.2mol / L; the concentration of pyridine is 0.15mol / L;

[0039] St...

Embodiment 2

[0046] Step 1: Add 25ml of N,N-dimethylacetamide into a three-necked flask with nitrogen protection and mechanical stirring, weigh 6mmol of 4,4'-diaminodiphenyl ether monomer into it, and dry it under nitrogen Stir at room temperature for 30 minutes until completely dissolved.

[0047]Step 2: Weigh the bisphenol A type diether dianhydride monomer with the amount of diaminodiphenyl ether diamine monomer and other substances, and add it to the above solution in 6 times, and the amount of the last addition is less than or equal to the previous one Half; after the addition was complete, it was stirred at room temperature for 22 hours to obtain polyamic acid.

[0048] Its chemical reaction equation is shown in formula (1):

[0049]

[0050] Step 3: Add acetic anhydride, triethylamine, and pyridine to the polyamic acid; the concentration of acetic anhydride is 1.0mol / L; the concentration of triethylamine is 0.3mol / L; the concentration of pyridine is 0.25mol / L;

[0051] Step 4: ...

Embodiment 3

[0058] Step 1: Add 25ml of N,N-dimethylacetamide into a three-necked flask with nitrogen protection and mechanical stirring, weigh 6mmol of 4,4'-diaminodiphenyl ether monomer into it, and Stir at room temperature for 28 minutes until completely dissolved.

[0059] Step 2: Weigh the bisphenol A type diether dianhydride monomer with the amount of diaminodiphenyl ether diamine monomer and other substances, and add it to the above solution in 5 times, and the amount of the last addition is less than or equal to the previous Half; after the addition was complete, it was stirred at room temperature for 22 hours to obtain polyamic acid.

[0060] Its chemical reaction equation is shown in formula (1):

[0061]

[0062] Step 3: adding acetic anhydride, triethylamine, and pyridine to the polyamic acid; the concentration of acetic anhydride is 1.5mol / L; the concentration of triethylamine is 0.6mol / L; the concentration of pyridine is 0.4mol / L;

[0063] Step 4: The mixture is heated t...

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Abstract

The invention discloses a shape memory polyimide prepared by virtue of chemical imidization and a preparation method thereof. The preparation method is used for preparing the thermoplastic shape memory polyimide by synthesizing a polyamide acid prepolymer from reaction monomers 4,4'-diaminodiphenyl ether and bisphenol A dianhydride and then carrying out chemical imidization under the action of acetic anhydride, triethylamine and pyridine. The glass-transition temperature of the thermoplastic shape memory polyimide exceeds 220 DEG C, and therefore, the thermoplastic shape memory polyimide can be applied to the field of the high-temperature shape memory polymers; and the thermoplastic shape memory polyimide has excellent processability, thermal stability, mechanical properties and shape memory properties.

Description

technical field [0001] The invention relates to the field of intelligent material shape-memory polymers, in particular to a chemical imide method for preparing shape-memory polyimide and a 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. SMP has the advantages of large reversible strain, low density, easy processing, and easy control of shape recovery temperature. It is playing an increasingly important role in many fields such as smart textiles, biomedicine, and aerospace. For example, Yakacki et al. have studied polyacrylate-based SMP scaffolds that are expected to be used in the treatment of cardiovascular and cerebrovascular diseases, which can recover their shape at normal body temperature (37°C) [Biomaterials.2007, 28, 2255-2263.]; So...

Claims

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Application Information

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