Resitivity-temperature characteristics of CB/HDPE gel composites formed under electron beam irradiation

Resistivity-temperature characteristics of CB/HDPE composites crosslinked b y irradiation of electron beam were studied, The results showed that CB/HDP E gel composites, which were generated through extraction by xylene for cro sslinked samples, exhibited much higher PTC intensity and distinctive NTC e ffect during the first heating-cooling cycle. But much better stability of resistivity as well as diminished NTC effect were observed when the composi tes was exposed to heating-cooling cycles subsequently. The phenomena obser ved above were related to the structure stability of the gel, suggesting th at crosslinking of the polymeric matrix is an effective method to stabilize conductivity and alleviate NTC effect for polymer composites filled with c onductive particles.