Pressure-sensitive polymer syntactic foam with through-cell structure and preparation method thereof

Abstract

The invention discloses a pressure-sensitive polymer composite foam with a through-hole structure and a preparation method thereof. The method comprises: preparing an oil phase; adding water-soluble salt, graphene oxide aqueous dispersion and ascorbic acid to water, and graphene oxide The size of the sheet layer is 10nm ~ 500nm, and the water phase is obtained; under the condition of stirring, the water phase is added to the oil phase to obtain a stable emulsion, and then placed in a closed reactor for reaction, after the reaction is completed, it is dried to constant weight, and the pressure is obtained. Sensitive polymer syntactic foam. The invention adopts the emulsion as a template, implements the in-situ polymerization technology in the presence of conductive filler particles, and prepares polymer composite foam with pressure-sensitive properties. The piezoresistive sensitive structure of the polymer foam and the breathable structure are formed and organically combined at the same time. The material is not only light in weight, but also breathable, and has stable signal reading performance and high signal reading accuracy.

Description

technical field [0001] The invention relates to the technical field of resistive pressure-sensitive sensors, in particular to a pressure-sensitive polymer composite foam with a through-hole structure and a preparation method thereof. Background technique [0002] Resistive pressure-sensitive polymer foam can exhibit obvious piezoresistive effect: when the material is deformed by force, the internal conductive network is rearranged, and the resistance value responds regularly with the deformation. And the material is light, flexible, and the device fits well. The "wearable device" constructed with it can read the dynamic body information such as body movement, breathing, and heartbeat in real time. It can be used in robotics, health monitoring, and biomechanics. There are important application prospects in these fields. [0003] The existing preparation methods of pressure-sensitive polymer foam mainly include "foaming method" and "solid-state template method". Yao H B (Adv...

AI Technical Summary

Problems solved by technology

Usually, this type of foam also has the structural characteristics of high porosity and large pore size, and its average pore size is mostly greater than 100 microns, so the specific surface area of ​​the skeleton is low. In the conductive network of fillers formed on the surface of the skeleton, the number of conductive contacts is difficult to occur when the material is deformed. Large changes, resulting in low material strain sensitivity, unable to meet the performance requirements of high-sensitivity sensor devices

Replacing conductive fillers with carbon black and silver nanoparticles can improve the sensitivity of pressure-sensitive polymer foams, but the preparation process is complicated. For example, Wu X (Adv. In the process of black / polyurethane syntactic foam, carbon black particles need to be repeatedly deposited on the polyurethane foam backbone for 15 times to obtain excellent sensitivity

[0004] In summary, the technology for preparing pressure-sensitive polymer foams with high sensitivity, stable performance, controllable pore structure, and convenient operation is still immature.

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