在光引发剂存在的条件下,采用紫外光对二氧化硅补强的硅橡胶进行了辐照交联.溶胀法测试结果表明,交联密度随光照时间的延长先增大,在8s后逐渐平稳.交联密度随光引发剂用量的增加先增加后减小,在0.6phr出现极大值.力学性能测试表明,紫外光辐照后硅橡胶的拉伸强度和断裂伸长率得到明显提高,分别达到6.1 MPa和713％.差示扫描量热法(DSC)和动态力学性能(DMA)测试表明,经紫外光辐照后,硅橡胶中形成的交联网络抑制了分子链的运动,使结晶度从38.1％减小到33.9％,损耗峰对应的熔融转变温度从-31.21℃降低到-42.35℃.
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