丁腈橡胶/导电粒子复合材料的正温度系数(PTC)特性

Positive Temperature Coefficient (PTC) Effects of Conductive Particles/Butadiene Nitrile Rubber Composites

将导电粒子碳黑和铜粉分别与丁腈橡胶混合制备导电聚合物复合材料，其中碳黑（Ｎ５５０）／丁腈橡胶复合材料的电阻率随温度的变化呈现较强的正温度系数（ＰＴＣ）效应。讨论了掺入导电粒子浓度、结构和表面性质以及混炼硫化工艺等对该类材料的室温电阻率及ＰＴＣ效应的影响。

Several conductive composites were prepared by milling conductive particles (carbon blacks and copper powders) and butadiene nitrile rubber of which a carbon black(N550)/butadiene nitrile rubber exhibits fairly good PTC effect with respect to the relations of its resistivity vs.temperature. The influences of some factors on the room temperature resistivity and PTC effect are discussed, the factors including the content, structure and surface characteristics of conductive particles and the processes of milling and vulcanizing ete.