辐射交联法制备微孔化硅橡胶的研究

采用辐射交联法制备微孔化硅橡胶材料，实现硫化与发泡分步进行，是探索射线技术用于制备高性能微孔材料的一种新方法。以二氧化硅为填料，以电子加速器为射线源辐照实现硅橡胶的硫化，再经高温发泡为微孔材料。主要研究辐照条件、填料含量等关键因素对硅橡胶性能与结构的影响，并用扫描电镜观察泡孔的形态结构。结果表明，通过控制吸收剂量和填料含量等条件，实现了硅橡胶材料微孔化。微孔化硅橡胶材料表面光滑，接近橡胶形态，而材料内部具有丰富的μm级小孔，孔壁完整，孔与孔间彼此不贯通，泡孔细小，胞体尺寸（平均）最小达14 μm，泡孔的均匀性好，其力学性能较好。

Preparation of Micro-pored Silicone Elastomer Through Radiation Crosslinking

The radiation crosslinking was adopted to prepare the micro-pored silicone elastomer, which was performed by vulcanization and foaming respectively. Radiation crosslinking is a new method to prepare micro-pored material with high performance by use of radiation technology. Silicon dioxide was used as filler, and silicone elastomer was vulcanized by electron beams, then the micro-pored material was made by heating method at a high temperature. The effects of absorbed dose and filler content on the performance and morphology were investigated. The structure and distribution of pores were observed by SEM. The results show that the micro-pored silicon elastomer can be prepared successfully by controlling the absorbed dose and filler content. It has a smooth surface similar to a rubber meanwhile the pores are round and unconnected to each other with the minimum size of 14 μm. And the good mechanical performance can be suitable for further uses.