Pressure-sensitive polymer syntactic foam with hierarchical cellular structure and preparation method thereof

Abstract

The invention discloses pressure-sensitive polymer compound foam with a multi-stage pore structure and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing hard monomers, cross-linking monomers and soft monomers, adding an initiator and an emulsifying agent, so as to obtain an oil phase; adding water-soluble salt, graphene oxide aqueous dispersion liquid and ascorbic acid into water, so as to obtain a water phase; and adding the water phase into the oil phase so as to obtain a stable emulsion, putting the emulsion in a closed reactor to react, and after the reaction is finished, drying to constant weight, so as to obtain the pressure-sensitive polymer compound foam. An emulsion template polymerization method utilized for preparing the pressure-sensitive polymer compound foam has the beneficial effects that (1) polymer foam with a multi-stage aperture structure can be prepared, and the pressure-sensitive polymer compound foam with a micron aperture can be prepared; and (2) compared with existing similar materials, the average aperture is decreased by one order, so that the specific surface area of a material skeleton can be substantially increased, and a pressure-sensitive polymer material with high response sensitivity to a counter stress and strain can be obtained.

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 multi-level pore structure and a preparation method thereof. Background technique [0002] When the piezoresistive polymer composite material is compressed and deformed, the conductive fillers inside the material contact to form a conductive node, and the nodes are connected to each other to form a conductive path. The material resistivity decreases and the output current of the connected circuit increases. The "wearable device" constructed based on this characteristic of the material can read body movement, breathing, heartbeat and other human dynamic signs in real time, and has important application prospects in the fields of robotics, health monitoring, and biomechanics. [0003] At present, one of the main research directions of piezoresistive polymer composites is the development of force-sensitive mate...

AI Technical Summary

Problems solved by technology

However, the existing preparation methods of pressure-sensitive polymer foam mainly include "foaming method" and "solid-state template method", neither of which has the ability to control the hierarchical pore structure of the foam

[0006] In summary, the technology for preparing pressure-sensitive polymer foams with highly sensitive hierarchical pore structures is still immature.

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