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A method for preparing high performance and multifunctional shape memory materials

A memory material and multi-functional technology, applied in the field of materials science, can solve problems such as methods that are rarely reported, achieve broad industrialization and market application prospects, simple process, and excellent performance

Active Publication Date: 2021-12-10
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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  • A method for preparing high performance and multifunctional shape memory materials
  • A method for preparing high performance and multifunctional shape memory materials
  • A method for preparing high performance and multifunctional shape memory materials

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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 preparing a high-performance and multifunctional shape memory material, comprising the following steps: S1, preparing a composite material; S2, performing multiple shape memory cycles on the composite material so as to realize the crystal structure and amorphous state of the composite material Regulate the relaxation behavior of the sub-segment of the region; S3, carry out the pre-stretching-recovery process on the composite material; S4, control the temperature and the magnitude of the strain in the pre-stretching-recovery process of the composite material; S5, through the pre-stretching The stretch-recovery process induces a crystal change in the composite. The present invention does not need to change the structural characteristics such as the composition and phase morphology of the material through external control means, and it utilizes the coupling effect of temperature and stress field in the implementation process to regulate the structure (crystalline region and amorphous region) of the composite material, thereby The improvement of shape memory performance and the expansion of other functional characteristics make composite materials have 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 Patents(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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