Optically transparent polymer-based shape memory material and preparation method thereof

A technology of optically transparent and memory materials, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve problems such as poor transparency, and achieve low production costs, simple processes, and excellent shape memory effects

Inactive Publication Date: 2020-11-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the shortcomings of poor transparency of polymer-based shape-memory materials currently produced by melt blending, the present invention explores an optically transparent polymer-based shape-memory material and its preparation method

Method used

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  • Optically transparent polymer-based shape memory material and preparation method thereof
  • Optically transparent polymer-based shape memory material and preparation method thereof
  • Optically transparent polymer-based shape memory material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Use polypropylene carbonate (PPC) (Mw=2.48 x 10 5 g / mol, Boda Dongfang) as the shape memory reversible phase with a refractive index of 1.46; thermoplastic polyurethane elastomer (TPU) (SP9324, BASF) with a Shore hardness of 60A as the shape memory stationary phase with a refractive index of 1.51. Before use, the raw materials were placed in a vacuum oven and dried at 40 °C and 80 °C for 24 h to remove moisture.

[0032] (2) Put PPC and TPU into two extruders (A, B) of the multi-layer extrusion system respectively (see figure 1), the speed ratio of the extruder is adjusted to 1:1, the temperature of each section of the extruder is controlled at 100-165-160-165°C and 175-185-180-185°C respectively, and the material in the extruder is melted and plasticized Finally, the two melts are superimposed in the confluence C to obtain a two-layer initial structure, and then flow out from the outlet die E of the rectangular flow channel after being sheared and stacked by six ...

Embodiment 2

[0034] (1) Polyvinyl acetate (PVAc) (Vinnapas UW 4fs, WACKER) was selected as the shape memory reversible phase with a refractive index of 1.47; thermoplastic polyurethane elastomer (TPU) (SP9324, BASF) with a Shore hardness of 60A was used as the shape memory Stationary phase with a refractive index of 1.51. Before use, the raw materials were placed in a vacuum oven and dried at 40 °C and 80 °C for 24 h to remove moisture.

[0035] (2) Put PVAc and TPU into two extruders (A, B) of the multi-layer extrusion system respectively (see figure 1 ), the speed ratio of the extruder is adjusted to 1:1, the temperature of each section of the extruder is controlled at 175-185-180-180°C and 185-195-190-185°C respectively, and the material in the extruder is melted and plasticized Finally, the two melts are superimposed in the confluence C to obtain a two-layer initial structure, and then flow out from the outlet die E of the rectangular flow channel after being sheared and stacked by si...

Embodiment 3

[0037] (1) Polylactic acid (PLA) (4032D, Natureworks Corp) was selected as the shape memory reversible phase with a refractive index of 1.45; thermoplastic polyamide elastomer (TPAE) (8211-70, DuPont) was used as the shape memory stationary phase with a refractive index of 1.5. The raw materials were dried in a vacuum oven at 80 °C for 24 h to remove moisture before use.

[0038] (2) Put PLA and TPAE into two extruders (A, B) of the multi-layer extrusion system respectively (see figure 1 ), the speed ratio of the extruder is adjusted to 1:1, the temperature of each section of the extruder is controlled at 100-180-175-180°C and 175-185-180-185°C respectively, and the material in the extruder is melted and plasticized Finally, the two melts are superimposed in the confluence C to obtain a two-layer initial structure, and then flow out from the outlet die E of the rectangular flow channel after being cut and stacked by nine layer multipliers D, where the confluence C The temper...

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Abstract

The invention discloses an optically transparent polymer-based shape memory material and a preparation method thereof. The material is composed of an optically transparent amorphous polymer and an optically transparent thermoplastic elastomer, and a special parallel alternate laminated structure ensures high optical transparency. In addition, the amorphous polymer serves as a shape memory reversible phase, and temporary shape fixation and thawing are achieved based on glass transition of the amorphous polymer; the thermoplastic elastomer serves as a shape memory stationary phase, elastic strain energy can be stored in the temporary shape shaping process, and when the thermoplastic elastomer is stimulated by body temperature, the stored energy is released and drives the material to return to the initial shape. The material prepared by the preparation method provided by the invention has excellent optical transparency and shape memory performance; the required raw materials are commercially available, and the formula is adjustable; the preparation method is simple, high in production efficiency and capable of realizing continuous batch production.

Description

technical field [0001] The invention relates to the field of processing and manufacturing high-performance functional polymer materials, in particular to an optically transparent polymer-based shape memory material and a preparation method thereof. Background technique [0002] Polymer-based shape memory materials generally refer to a class of smart materials that can return from a temporary shape to an initial shape under temperature stimulation, and have been widely used in many fields such as biomedicine, packaging and sealing, drive sensing, and aerospace. The polymer-based shape memory material is composed of a shape memory reversible phase and a shape memory stationary phase. The shape memory reversible phase has a reversible "melt-crystallization" or glass transition, providing a shape memory switch temperature, and playing the role of fixing and unfreezing the temporary shape , while the shape memory stationary phase is responsible for remembering the initial shape. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B32B27/40B32B27/08B32B7/023B32B27/30B32B27/34
CPCB32B27/365B32B27/40B32B27/08B32B7/023B32B27/306B32B27/36B32B27/34B32B2250/42
Inventor 郑宇曾兵兵郭少云杨丽华
Owner SICHUAN UNIV
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