Thermotropic type shape memory composite material

A technology of composite materials and memory polymers, applied in textiles, fabrics, textiles and papermaking, etc., can solve problems such as low mechanical properties, affecting aerodynamic shape, uneven heating, etc.

Inactive Publication Date: 2016-07-27
AVIC COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a thermally induced shape memory composite material, which can achieve uniform self-heating and improve shape memory composite materials, in view of the problems of low mechanical properties, uneven heating and affecting aerodynamic shape of the current thermally induced shape memory composite materials. Material properties without affecting the aerodynamic shape of shape memory composite parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The thermoplastic shape-memory polyurethane and carbon nanotubes (mass ratio: shape-memory polyurethane:carbon nanotubes=100:50) are uniformly mixed at a certain temperature, and then granulated by extrusion to obtain a carbon nanotube-reinforced shape-memory composite material. A heat-induced shape memory composite material with a certain shape and a structure-function integration is manufactured by using an injection molding process.

Embodiment 2

[0021] The thermoplastic shape-memory polyurethane is prepared into a film with a thickness of 0.2 mm by biaxial stretching. After the carbon nanotubes are prepared into carbon nanotube fibers with continuous lengths, they are arranged in a continuous "S" shape with an interval of 3 mm between two layers of shape memory polyurethane films. After vacuum packaging, place it in a heating oven, heat it to 140°C, keep it for 30 minutes, take it out after natural cooling, and obtain a thermotropic shape memory composite material with integrated structure and function.

Embodiment 3

[0023] Preparation of thermosetting shape-memory epoxy resin film: Use a film machine to prepare shape-memory epoxy resin into a film with a thickness of 0.2mm, attach it to the release paper, and cut it according to a certain size.

[0024] Preparation of carbon nanotube fiber fabric: prepare carbon nanotubes into fibers, and then weave them into unidirectional fabrics by weaving, wherein non-conductive glass fibers are used as weft yarns, and cut according to a certain size.

[0025] Lay the cut carbon nanotube plain fabric between two layers of thermosetting shape memory epoxy resin film. Then carry out vacuum packaging, place in a heating oven, and cure according to the standard curing process of the epoxy resin to obtain a thermotropic shape memory composite material with integrated structure and function.

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Abstract

The invention belongs to the field of shape memory functionalized application technology of high performance polymer matrix composite materials, and provides a thermotropic type shape memory composite material. The material comprises the following components: a shape memory polymer and carbon nanotube, wherein the content of the shape memory polymer is 15-85wt%, and the content of the carbon nanotube is 85-15wt%. The carbon nanotube has excellent mechanical properties, electrical property and thermal conductance performance; the carbon nanotube can be used as an enhancer of the polymer matrix composite material, and can be used as a heating element of the thermotropic type shape memory composite material. The thermotropic type shape memory composite material needs to be heated to a certain temperature in order to realize the function thereof, the carbon nanotube of the carbon nanotube enhanced polymer matrix shape memory composite material can be directly electrified for heating, so that dual functions for enhancing and heating the shape memory composite material are realized.

Description

technical field [0001] The invention belongs to the technical field of shape-memory functional application of high-performance polymer-based composite materials, and relates to a heat-induced shape-memory composite material. Background technique [0002] Thermotropic shape memory polymer is a new type of stimulation-sensing functional material, which has the characteristic of changing shape under the change of external temperature, and is a new type of intelligent material. Compared with shape memory alloys, thermotropic shape memory polymers have the advantages of low density, high shape recovery rate, wide memory recovery temperature, large deformation, good processability and low cost. But at the same time, it also has weaknesses such as poor mechanical properties, which cannot meet the requirements of the aerospace field. In order to overcome this weakness, fibers, particles and other reinforcing materials are usually used to reinforce thermotropic shape memory polymers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08L63/00C08K7/24C08K7/14D03D15/00D03D15/275
Inventor 高军鹏邓华包建文益小苏
Owner AVIC COMPOSITES
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