【摘要】 采用橡胶加工分析仪,在一定的温度和频率下,分析了不同性质结构的气相法纳米二氧化硅在高温硅橡胶中的聚集体网络结构差异,以及聚集体网络对填充胶动态流变性能的影响.研究发现,高分支结构聚集体填充胶具有较高的剪切模量及损耗模量,对应变的依赖性大,补强作用好.更多还原

【Abstract】 Fillers, when added to polymer systems, are known to cause a considerable change in dynamic behaviors especially for fumed silica with tridimensional network. A torsional strain-controlled rheometer named rubber processing analyzer (RPA) was used for measuring the dynamic rheological properties of high-temperature vulcanites (HTV) with molecular weight of 600000 g/mol at a certain temperature and frequency. And the differences in aggregate network of fumed silica dispersed in the filled silicone rubber were also investigated by RPA. The results indicated that the shearing and loss modulus of filled silicone rubber with more developed aggregate network showed more strain dependence. And the fumed silica with more developed aggregate network showed a better reinforcement to HTV.更多还原