摘要
以双组份硅橡胶为基体,镍包石墨为导电粒子,制备了双组份硅橡胶/镍包石墨复合材料。研究了导电粒子填充量对复合体系触变性能及力学性能(拉伸强度、断裂伸长率)的影响,并在不同温度下的蠕变和应力松弛模式中考察了复合材料的力学性能和导电性能。结果表明:复合体系的触变指数随填充量的增加而增加,过量填充量会使体系的流动性变差;当填充量介于50%～54%之间时,复合材料显示最优的拉伸强度和断裂伸长率,复合材料在蠕变和应力松弛过程中的电阻均随时间而下降。温度越高,电阻下降越明显,表现出很明显的PTC效应。
Two-component silicon rubber/nickel-coated graphite composites were prepared with two- component sil- icon rubber as matrix and nickel-coated graphite as conductive particle. The effect of nickel-coated graphite content on thix- otropy and mechanical properties（tensile strength and breaking elongation ）of the compound system were studied, and the mechanical properties and electricity of the composite were explored under creep model and stress relaxation model with dif- ferent temperature. The result indicated that thixotropy index of the compound system was increased with incrersing con- tent of nickel-coated graphite , and the system liquidity will change to bed when the nickel-coated graphite content was ex cessed. The tensile strength and breaking elongation of the composite will be the best when nickel-coated graphite content between 50 %-54%. The electric resistance of the composite was decreased with time during creep and stress relaxation. The higher the temperature, the more obvious the resistance deereaseing, which showed obvious PTC effect.
出处
《化工新型材料》
CAS
CSCD
北大核心
2013年第3期45-47,59,共4页
New Chemical Materials
基金
武汉市科技攻关项目(200710321090-18)
关键词
镍包石墨
硅橡胶
触变性
蠕变
应力松弛
nickel-coated graphite,silicon rubber,thixotropy,creepage,stress relaxation
