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Aisotropic electro-shape memory polymer microlayer composite material

A composite material and polymer technology, applied in the field of functional polymer composite materials and their preparation, can solve the problems of small adjustable range of shape memory performance, difficult control of shape recovery process, inability to achieve anisotropy, etc. Mass production, easy promotion and application, low cost effect

Pending Publication Date: 2018-11-23
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the technical problems such as the poor designability of the morphology and structure of the existing electric shape memory polymer materials, the inability to realize anisotropy, the small adjustable range of the shape memory performance, and the difficult control of the shape recovery process, etc., and proposes an amphitropic electrotropic Shape memory polymer microlayer composites

Method used

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  • Aisotropic electro-shape memory polymer microlayer composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] After the polycaprolactone (PCL) pellets and carbon black (CB) powder are physically and mechanically mixed according to the mass ratio of 70:30, after being melted, extruded and granulated by a twin-screw extruder, they are mixed with polyolefin Elastomer ethylene-octene copolymer (POE) pellets are put into the two extruders of the micro-layer co-extrusion device respectively, the speed ratio of the extruders is 1:l, and the temperature of each section of the extruder is controlled at 70-200 ℃, the temperature of the confluence, the split stacking unit and the die is about 200 °C, and 3 split stacking units are used. POE and PCL blended with CB are melted and plasticized by the extruder, combined in the confluence, cut and re-stacked in sequence by the split and superimposed units, flow out of the die, and cooled by the cooling roll and the winding roll. Traction, the POE / PCL / CB multilayer shape memory polymer material with 16 layers was prepared. The thermal response...

Embodiment 2

[0047] After the polyolefin elastomer ethylene-octene copolymer (POE) pellets and carbon black (CB) powder are physically and mechanically mixed according to the mass ratio of 70:30, they are melted, extruded and pelletized by a twin-screw extruder , put it and polycaprolactone (PCL) pellets into two extruders of the micro-layer co-extrusion device respectively, the others are the same as in Example 1, the shape memory performance, volume conductivity and electrical recovery rate of the obtained material are the same as Embodiment 1 is basically the same.

Embodiment 3

[0049] Others are the same as in Example 1, and the speed ratio of the extruder is 1:3. The thermal response temperature range of the obtained POE / PCL / CB shape memory polymer material is 50-80°C, the shape recovery rate is over 90%, and the shape fixation rate is over 80%. The volume conductivity parallel to the layer direction can reach 12Ω / cm, and the electrical recovery rate is above 85%; the volume conductivity perpendicular to the layer direction is infinite, and the electrical recovery rate is 0.

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Abstract

The invention relates to an aisotropic electro-shape memory polymer microlayer composite material. The composite material is alternately arranged by a recovery layer polymer and a reversible layer polymer, wherein the recovery layer or the reversible layer is doped with conductive filler, and another layer is filled with a pure polymer. Conductive filler doping and multi-layer structure provide the material with conductivity in a direction parallel to the layers, and with no conductivity in a direction perpendicular to the layers; by loading a voltage in the direction of the material conduction, current generates heat to increase temperature of a system, thereby realizing recovery from a temporary shape to an original shape to obtain an anisotropic electro-shape memory polymer composite material; the aisotropic electro-shape memory polymer microlayer composite material can adjust shape recovery speed by adjusting the magnitude of the applied voltage, control progress and stop of the shape recovery by applying and releasing the voltage, and break through an uncontrollable barrier of recovery process; organic solvent is not used in the preparation process of the aisotropic electro-shape memory polymer microlayer composite material, so the preparation has the advantages of simple operation, environmental protection, and low cost, is easy to be mass-produced, and has a very high commercial perspective.

Description

technical field [0001] The invention relates to the technical field of functional polymer composite materials and their preparation, in particular to an amphitropic electro-induced shape memory polymer microlayer composite material. Background technique [0002] Shape memory polymer materials are a class of smart materials that can respond to external conditions. They can "memorize" the original shape, and then be molded into various required temporary shapes. When the external temperature, magnetic field, humidity, etc. reach specific conditions , which automatically returns to its original shape. Compared with shape memory alloys and shape memory ceramics, shape memory polymer materials have many advantages such as easy shaping, softness, large deformation, adjustable response conditions, various triggering methods, printability, light weight, and low cost. received widespread attention. Shape memory polymer materials have a very wide range of uses, for example, in the m...

Claims

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Application Information

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IPC IPC(8): B32B27/08B32B27/20
CPCB32B27/08B32B27/20B32B2307/202
Inventor 杜江刘道斌张震雷
Owner TONGJI UNIV
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