摘要
本文利用硅氮聚合物作文联剂使双组分缩合型室温硫化硅橡胶在不需要催化剂存在下就能交联硫化，通过时硫化胶老化后的热失重、交联密度和力学性能的测定，表明这种硫化胶的耐温性能由２００℃提高到３５０℃。对硫化胶的降解动力学研究表明：降解反应活化能由７０ｋＪ／ｍｏｌ提高到３３０ｋＪ／ｍｏｌ，这是由于消除了端基引发的主链降解。
The conventional two-component condensation-type RTV silicone rubber was vulcanized by polysi-lazane cross-linking agent.By the determination of the isothermal weight-loss ,crosslinking density and me-chanical properties of the vulcanizates after heat ageing in the inert atmosphere,it was found that theRTV silicone rubbver vulcanized by KH-CL cross linking agents could resist to 350℃,and that the activa-tion energy of thermal degradation reaction of the vulcanizates was 33 0kJ/mol,it was therefore attributedto eliminating the degradation of siloxane chain initiated by the residual catalyst and the silanol groups in thevulcanizates.
基金
国家自然科学基金
关键词
硫化
硅橡胶
硅氮聚合物
交联剂
热稳定性
Two -component Condensation-type RTV Silicone Rubber, Polysilazane Cross-linking A-gent,High-temperature Resistance,Degradation of Main Chain
