中文摘要：

以LiOH为引发剂、DMF为促进剂，D4、P4、V4为单体，采用阴离子开环聚合方法，合成了特定分子结构的高分子量三元嵌段共聚硅橡胶。应用粘度法、凝胶色谱法、红外光谱及质谱等方法对合成产物进行了表征，分析了三嵌段硅橡胶的性能。结果表明，嵌段共聚硅橡胶较无规共聚硅橡胶具有更好的综合性能，尤其使硅橡胶的弹性及压缩永久变形等性能得到明显改善，可满足某些特殊应用需求。

英文摘要：

The synthesis of polydimethyl siloxane-diphenyl siloxane-methylvinyl siloxane tri-block copolymer which has given molecular structure and high molecular weight were carried out by anionic ring-opening living polymerization method, using the following reagents D4, P4, V4, LiOH（initiator）, DMF（promoter） and Toluen（solvent）. The characterization of the tri-block copolymerization products was carried out using viscometry, gel permeation chromatography, FT-IR and 1HNMR. The performance of the tri-block copolymer was described. The result shows that the combined properties of block copolymerization polysiloxane rubber are better than that of random copolymerization polysiloxane rubber, especially the elasticity and compression permanent set properties, which can meet some critical application requirements.