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Double-layer polymer-based electric response shape memory material and preparation method thereof

A polymer-based, memory material technology, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, chemical instruments and methods, synthetic resin layered products, etc., can solve the problem of small variable range of shape memory properties and adjustment of conductive properties Single method, difficult to control the dispersion of conductive particles and other problems, to achieve the effect of easy continuous production, low cost and easy operation

Active Publication Date: 2020-08-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the technical problems of existing high-molecular-based electroresponsive shape-memory materials, such as poor flexibility in shape and structure design, difficulty in regulating the dispersion of conductive particles, single conductivity adjustment method, and small variable range of shape-memory performance, and proposes a double-layer high-molecular-based Electroresponsive shape memory material and preparation method thereof

Method used

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  • Double-layer polymer-based electric response shape memory material and preparation method thereof
  • Double-layer polymer-based electric response shape memory material and preparation method thereof
  • Double-layer polymer-based electric response shape memory material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] (1) Polycaprolactone (PCL) (6800, Perstorp Corp) was selected as the shape memory reversible phase, and thermoplastic polyurethane elastomer (TPU) (S85A11, BASF) with a Shore hardness of 85A was used as the shape memory stationary phase, with an average diameter of Multi-walled carbon nanotubes (MWCNTs) (NC 7000, Nanocyl SA) with a length of 9.5 nm and a length of 1.5 μm were used as conductive particles. Before use, the raw materials were placed in a vacuum oven and dried at 40°C, 80°C, and 80°C for 24 hours to remove moisture.

[0034](2) Mix TPU and MWCNTs evenly at a mass ratio of 95:5, and then extrude and granulate through a twin-screw extruder. The temperature of each section of the extruder is 165-180-180-180˚C. The TPU / MWCNTs composite masterbatch and PCL are uniformly hot-pressed into a thin sheet with a thickness of 0.6mm, and then the two sheets are laminated in parallel and hot-pressed again to obtain a two-layer composite with a two-phase layer thickness r...

Embodiment 2

[0036] The stimulation voltage was adjusted up to 30V, and the others were the same as in Example 1. After calculation and testing, the shape recovery rate of this material is equivalent to that of Example 1, but the shape recovery speed is accelerated, and the shape recovery can be completed within 30s.

Embodiment 3

[0038] Mix TPU and MWCNTs at a mass ratio of 97:3, and PCL and MWCNTs at a mass ratio of 98:2, respectively, and then extrude and granulate through a twin-screw extruder, and hot-press the two composite masterbatches into a thickness of 0.6 mm, the others are the same as in Example 1. After calculation and detection, the resistivity in this material is reduced to 12.0Ω·cm, and the shape recovery speed is accelerated, and the shape recovery can be completed within 25 s under the stimulation of 20v voltage, and the shape recovery rate is equivalent to that of Example 1.

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Abstract

The invention discloses a double-layer polymer-based electric response shape memory material and a preparation method thereof. The material is a double-layer compound prepared by laminating and hot-pressing a thermoplastic polymer elastomer serving as a stationary phase and a crystalline or amorphous polymer material serving as a reversible phase, wherein one-phase material is doped with conductive particles or two-phase materials are simultaneously doped with conductive particles. When voltage stimulation is applied, the temperature of the material rises due to the electrothermal effect generated by the conductive particles, the molecular chain of the reversible phase polymer material is unfrozen, and then electric response shape recovery is achieved. The polymer-based electric shape memory material prepared by the preparation method can realize flexible regulation and control of the shape recovery speed and the shape recovery rate by adjusting the voltage, the types, contents and distribution modes of the conductive particles, the layer thickness ratio of the stationary phase to the reversible phase and the like; the required raw materials are commercially available so that the production cost is low; the preparation method is simple in process, high in production efficiency and capable of realizing continuous batch production.

Description

technical field [0001] The invention relates to the field of polymer-based functional materials and their processing and manufacturing, in particular to a double-layer polymer-based electroresponsive shape memory material and a preparation method thereof. Background technique [0002] Shape memory polymer materials refer to a class of intelligent materials that can adjust their own state parameters under the stimulation of changes in the external environment (such as light, heat, electricity, magnetism, water, etc.), and return to the initial state from a temporarily set shape. , of which the most widely studied is the thermoresponsive shape memory polymer material. Thermally responsive shape memory polymer materials usually have a significant thermal / phase transition, based on which a shape memory switching temperature can be provided: when the material is heated above the switching temperature, an external force is applied to construct a temporary shape and then cooled to ...

Claims

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Application Information

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IPC IPC(8): B32B27/20B32B37/06B32B37/10B32B27/40B32B27/28B32B27/08H01B1/16H01B1/18H01B1/22H01B1/24C08L75/04C08L67/04C08K3/04
CPCB32B27/20B32B37/06B32B37/10B32B27/40B32B27/28B32B27/08H01B1/22H01B1/24H01B1/16H01B1/18C08K3/041C08K3/042C08L2201/12C08K2201/001C08K2201/011B32B2307/202C08L75/04C08L67/04
Inventor 郑宇杨丽华郭少云
Owner SICHUAN UNIV
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