高转变温度聚合物PTC材料的研究

Nylon12/carbon black composite with high PTC transition temperature

研究了以尼龙12（PA12）为基体树脂，炭黑（CB）为导电填料的高转变温度聚合物正温度系数（P11C）材料。采用熔融共混方法制备了PA12/CB聚合物PTC复合材料，研究了炭黑种类、炭黑含量、炭黑表面改性等因素对PA12/CB复合材料PTC性能的影响。结果表明：Vxc305炭黑填充的PA12复合材料，当炭黑含量为30％时，PTC强度可达到105；炭黑表面改性能够抑制材料的NrC效应。

Using nylonl2 （PAl2） as based material and carbon black （CB） as conductive filler material, PTC conductive composite with high translation temperature was studied. PA12/CB composites were prepared by melt-mixing. The influence of CB grade, CB content and CB surface modification on the PTC properties of the PA12/CB composites was studied. The results showed that for filled with 30wt% Vxc305 CB, the PTC intensity of PA12/CB composite reached 105, and by surface modification of CB, the NTC effect of the composites can depress.