Shape memory polyurethane with high-temperature restorability

A recovery ability, polyurethane technology, applied in the field of polymer materials, can solve the problems of high temperature resistance, loss of shape recovery ability, low glass transition temperature, etc. The effect of restoring the temperature

Inactive Publication Date: 2015-02-25
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although there are so many advantages, traditional shape-memory polyurethane materials have relatively large defects. First, their glass transition temperature is relatively low, generally below 50°C. At 40°C, some polyurethane materials begin to soften; secondly, traditional Polyurethane material is not resistant to high temperature, and it loses its shape recovery ability when it exceeds 80°C. Therefore, it is of great application value to develop a shape memory polyurethane material with high temperature recovery ability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] Preparation of reagents required for the reaction:

[0021] Use concentrated hydrochloric acid with a mass fraction of 36.6% to prepare 1 mol / L dilute hydrochloric acid. Titrate the concentration of hydrochloric acid with the calibrated sodium hydroxide solution.

[0022] Preparation of 2mol / L di-n-butylamine-toluene solution: Take 130g of di-n-butylamine solution, dilute it to the mark with toluene in a 500ml volumetric flask, shake well, and put it in a solvent bottle for later use.

[0023] Activation treatment of carbon fiber: irradiate the carbon fiber to be activated under the radiation Co ray at room temperature.

[0024] Synthesis of polyhexamethylene adipate: In a four-necked bottle, add hexanediol, succinic acid and adipic acid, catalyst stannous chloride, and solvent decahydronaphthalene in proportion to the four-necked bottle, and heat in an oil bath, first at 150 React at ~160°C for 2 hours, then react at 190~200°C for 12 hours, the reaction is stopped, a...

example 1

[0028] (1) Preparation of reagents required for the reaction: Preparation of 1mol / L hydrochloric acid solution Take 50g of concentrated hydrochloric acid with a mass fraction of 36.6%, dilute to the mark with distilled water in a 500ml volumetric flask, and mix well. Take 20g of sodium hydroxide and dissolve it with distilled water, then pour it into a 500ml volumetric flask and dilute to the mark with distilled water, and mix well. Take a certain amount of potassium hydrogen phthalate and place them in conical flasks, dissolve them in distilled water, add a few drops of phenolphthalein as an indicator, and titrate with the prepared sodium hydroxide solution. When the solution changes from colorless to red, it will As the end point, measure three times and calculate its average value to obtain the concentration of sodium hydroxide solution. Titrate hydrochloric acid with a calibrated sodium hydroxide solution, using methyl orange as an indicator, and the end point is when the ...

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Abstract

The invention relates to a shape memory polyurethane material with high-temperature restorability, which is characterized in that irradiation-activated carbon fibers are added as a reinforcer to synthesize the polyurethane shape memory material with high-temperature restorability in situ. The synthesis method comprises the following steps: (1) activating treatment of carbon fibers: activating the carbon fibers to be activated at room temperature under the irradiation of radioactive Co rays; (2) synthesis and purification treatment of hexanediol polyadipate; and (3) in-situ synthesis of shape memory polyurethane: firstly synthesizing a polyurethane prepolymer, then adding the activated carbon fibers into the prepolymer to continue the reaction, and adding a chain extender for further polymerization, thereby forming the polyurethane with shape memory function. The method can overcome the operating restrictions caused by lower glass transition temperature in the common shape memory polyurethane material, well solves the problem of poor mechanical properties, enhances the tensile strength of the shape memory polyurethane material, and widens the application range of the material.

Description

technical field [0001] The invention belongs to the field of polymer materials. Specifically relates to a shape memory polyurethane material with high temperature recovery ability. Background technique [0002] Shape memory polyurethane material is a new type of functional material with many excellent comprehensive properties. Shape memory materials refer to a new type of material that has an initial shape, and after being deformed and fixed, the external conditions can be changed by heating or other methods to restore the original shape. Since the French ORKEM company developed the first shape memory polymer (SMP) polynorbornene in 1984, the currently applied shape memory polymer materials include polynorbornene, trans 1,4-polyisoamyl Diene, styrene-butadiene, polyurethane, etc., in addition to fluorine-containing polymers, polycaprolactone, polyamide, etc. also have shape memory function. Among many materials, shape memory polyurethane has become a hot spot in SMP resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32C08G18/10C08G63/16C08G63/85C08K9/00C08K7/06
CPCC08G18/664C08G18/10C08G18/3206C08G18/4238C08G63/16C08G2280/00C08K7/06C08K9/00C08K2201/004
Inventor 李东平刘昕阳赵维祎吴晓菁李世财王春雨孙苗
Owner HARBIN UNIV OF SCI & TECH
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