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A kind of preparation based on supercritical foaming process electro-induced polypropylene carbonate-based shape memory composite material and method

A polypropylene carbonate and composite material technology, applied in the field of shape memory material preparation, can solve problems such as poor interface bonding performance, low mechanical strength, and reduced mechanical properties of composite materials, and achieve the effect of improving electrical conductivity and good mechanical properties

Active Publication Date: 2021-09-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The content of carbon nanotubes in its composite material is at least 15wt.%, but the addition of too much carbon nanotube filler will reduce the mechanical properties of the composite material
[0007] The existing shape memory materials mainly have the following problems: 1) Polypropylene carbonate has good shape memory properties, but its low mechanical strength leads to its narrow application range
2) Conductive particles generally belong to inorganic materials, and the interfacial bonding performance with polymers is poor. To change shape memory polymers from insulators to conductors, a large number of conductive particles need to be filled, which will damage the mechanical properties of shape memory polymers. Narrows the range of applications for polymer memory materials

Method used

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  • A kind of preparation based on supercritical foaming process electro-induced polypropylene carbonate-based shape memory composite material and method
  • A kind of preparation based on supercritical foaming process electro-induced polypropylene carbonate-based shape memory composite material and method
  • A kind of preparation based on supercritical foaming process electro-induced polypropylene carbonate-based shape memory composite material and method

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Experimental program
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Effect test

Embodiment 1

[0040] (1) Polypropylene carbonate, polylactic acid and carbon nanotubes are fully mixed in proportion and then melt blended, wherein the mass ratio of polypropylene carbonate, polylactic acid and carbon nanotubes is 76:19:5;

[0041] (2) Put the mixture obtained in step (1) into an autoclave with a plate spline mold and seal it, heat the autoclave to 150°C, and inject supercritical CO with a supercritical gas injection system. 2, ventilate in advance for one minute to remove the air in the autoclave, then close the pressure relief valve, control the pressure at 20MPa, keep at constant temperature for 2 hours, then quickly cool down to 50°C, keep at constant temperature for 15 minutes, and then quickly release the pressure to normal pressure, and finally the autoclave is cooled to room temperature to obtain a polypropylene carbonate foam material, that is, a composite material.

Embodiment 2

[0043] (1) be that the mass ratio is 57:38:5 polypropylene carbonate, polylactic acid and carbon nanotubes are fully melted and mixed in proportion to obtain a homogeneous blend;

[0044] (2) Put the polypropylene carbonate mixture obtained in step (1) into an autoclave with a sheet spline mold and seal it, heat the autoclave to 150°C, and inject supercritical CO with a supercritical gas injection system. 2 , ventilate in advance for one minute to remove the air in the autoclave, then close the pressure relief valve, control the pressure at 20MPa, keep at constant temperature for 2 hours, then quickly cool down to 50°C, keep at constant temperature for 15 minutes, and then quickly release the pressure to normal pressure, and finally the autoclave is cooled to room temperature to obtain a polypropylene carbonate foam material, that is, a composite material.

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Abstract

The invention belongs to the technical field of shape-memory materials, and discloses a supercritical foaming technology-based preparation of an electro-induced polypropylene carbonate-based shape-memory composite material and a method thereof. The method: 1) melt-blending polypropylene carbonate, polylactic acid and carbon nanotubes to obtain a composite material of polypropylene carbonate / polylactic acid / carbon nanotubes; 2) using supercritical CO 2 The composite material obtained in step 1) is subjected to intermittent foaming as a foaming agent to obtain a polypropylene carbonate shape memory composite material. The method of the invention reduces the added amount of carbon nanotubes and lowers the penetration threshold of the composite material, but at the same time increases the electrical conductivity of the composite material, and the composite material also has better mechanical properties.

Description

technical field [0001] The invention belongs to the field of preparation of shape-memory materials, in particular to a method for preparing electro-induced polypropylene carbonate-based shape-memory composite materials based on a supercritical foaming process. Background technique [0002] Shape memory material is a kind of intelligent material, which can sense and respond to environmental changes (such as temperature, light, electromagnetic, solvent, etc.), and return to the material in a preset state. Shape memory polymers (SMPs) refer to polymers with an initial shape that can be stimulated by the external environment to restore the original shape after being deformed and fixed. According to the principle of SMP memory recovery, it can be divided into: heat-induced SMP, photo-induced SMP, chemical induction SMP and so on. [0003] Polypropylene carbonate (PPC), also known as polymethylethylene carbonate, is a completely degradable environmentally friendly plastic synthes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L69/00C08L67/04C08K3/04C08J9/12
CPCC08J9/0061C08J9/0066C08J9/122C08J2203/06C08J2203/08C08J2369/00C08J2467/04
Inventor 殷小春李子建
Owner SOUTH CHINA UNIV OF TECH
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