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CSJ Journals

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2020, Vol.49, No.10

1224-1227

Thermoresponsive Conductivity of Acrylamide-based Polymers and Ni Microparticle Composites

Hayato Onishi ,Yuta Koda ,*,† and Hideo Horibe *
Department of Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
https://doi.org/10.1246/cl.200342

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Abstract

Composite materials with polymers and inorganic fillers enable the preparation of a variety of functional polymer materials. In particular, composites with crystalline polymers and Ni microparticles (NiMPs) can be applied to thermoresponsive conductive materials which are called PTC (positive temperature coeffcient) materials. These materials are conductive around room temperature, and turn to insulators at high temperature. This phenomenon is induced by the volume expansion of the crystalline domains, therefore, the design of matrix polymers has been limited. Herein, we showed PTC phenomena by using polyacrylamide-based (co)polymers in lieu of crystalline polymers. Those materials showed PTC phenomena regarding conductivity probably owing to the hydrogen bonding, yet polyacrylamides are amorphous polymers.

figure

Theremoresponsive conductive materials were produced from polyacrylamide-based polymers and Ni microparticles. The materials exhibited PTC (positive temperature coeffcient) phenomenon regarding electric resistivity, yet such PTC phenomena had been observed only in crystalline polymer-based composite materials. Our strategy of using polyacrylamides will contribute to the development of PTC materials by diversifying the material design.

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