电子束辐照交联CB/HDPE凝胶复合物的阻温特性

Resitivity-temperature Characteristics of CB/HDPE Gel Composites Formed Under Electron Beam Irradiation

对电子束辐照交联并经溶剂抽提得到的炭黑 /高密度聚乙烯 (CB/ HDPE)凝胶复合物的阻温特性进行了研究 .结果表明 ,凝胶复合物与未抽提的交联试样和未交联试样相比 ,其 PTC强度显著增大 ,并伴有明显的 NTC现象 .经热冷循环后 ,表现出很好的阻温特性稳定性 ,并且 NTC现象消失 .表明阻温特性的稳定性及 NTC现象的消除强烈依赖于 CB/

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