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Method for preparation of high performance and multifunctional shape memory material

A memory material and multi-functional technology, applied in the field of materials science, can solve problems such as rarely reported methods, achieve broad industrialization and market application prospects, high application value, and improve the effect of shape memory performance.

Active Publication Date: 2019-09-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In other words, "shape memory" is not only a way to realize functions, but may also become an intelligent control method for material structure optimization, performance improvement and function expansion; however, so far, such ideas and methods are rarely seen. to report

Method used

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  • Method for preparation of high performance and multifunctional shape memory material
  • Method for preparation of high performance and multifunctional shape memory material
  • Method for preparation of high performance and multifunctional shape memory material

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Embodiment

[0034] (1) The crystalline / amorphous polymer composite system is the research object, and the typical polycrystalline semi-crystalline polymer polyvinylidene fluoride (PVDF) and the amorphous polymer with good compatibility and strong molecular chain interaction are selected. Polymethyl methacrylate (PMMA) was used as the raw material, and the raw material was dried in a vacuum oven at 80°C for 12 hours to remove moisture before use;

[0035] (2) PVDF and PMMA were melt-mixed by an internal mixer at 200°C, and then pressed into a composite sheet at the same temperature. The shape memory properties of PVDF, PMMA and their blends were tested by DMA and the corresponding R f and R r . When the test temperature is 80°C and the deformation is 50%, the R of each sample f and R r They are:

[0036] PVDF 2 / 1 1 / 1 PMMA Fixed rate (R f ), %

90.2 96.4 97.4 99.9 Response rate (R r ), %

43.5 57.1 68.2 37.1

[0037]In the table, 2 / 1 means t...

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Abstract

The invention discloses a method for preparation of a high performance and multifunctional shape memory material. The method includes the steps of: S1, preparing a composite material; S2, subjecting the composite material to repeated shape memory circulation so as to realize regulation of the composite material's crystal structure and amorphous region molecular chain segment's relaxation behavior;S3, conducting prestretching-recovery on the composite material; S4, controlling the temperature and strain size in the prestretching-recovery process of the composite material; and S5, inducing thecrystal form change of the composite material through the prestretching-recovery process. The method provided by the invention has no need for change the composition, phase morphology and other structural characteristics of the material through an external control means, and utilizes the coupling effect of temperature and stress field in the implementation process to regulate the structure of thecomposite material (crystal and amorphous regions), thus realizing improvement of the shape memory performance and expansion of other functional characteristics, and endowing the composite material with higher application value.

Description

technical field [0001] The invention relates to the field of material science, in particular to a method for preparing high performance and multifunctional shape memory materials. Background technique [0002] As an important class of smart materials, shape memory polymers (Shape-memory-polymer, -SMP) can be fixed from the initial shape to a temporary shape under certain conditions, and then stimulated by the external environment (such as heat, light, electricity, magnetic , solvent, etc.), the shape recovery can occur again. Compared with shape memory alloy materials, SMP has many advantages such as light weight and low price, large deformation, various and adjustable stimulation methods, easy deformation, light weight and low price, good processing formability, and biodegradability. It has attracted the attention of the scientific and industrial circles, and has shown great application potential in the fields of smart packaging, aerospace, biomedicine, and flexible electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08L33/12
CPCC08L27/16C08L2201/12C08L33/12
Inventor 沈佳斌吉笑盈郭少云郑宇
Owner SICHUAN UNIV
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