摘要
用二甲基环体硅氧烷(DMC)在阴离子催化条件下开环反应制备了端羟基聚二甲基硅氧烷(HPDMS),将HPDMS与正硅酸已酯(TEOS)在二丁基二月桂酸锡(DBTDL)催化作用下交联合成了有机硅弹性体。研究了不同开环条件对HPDMS黏度的影响以及不同相对分子质量HPDMS的硫化,结果表明,DMC开环聚合发生的最低温度为80℃,阴离子本体聚合HPDMS的适宜工艺条件是:反应温度为120℃,反应时间为80 min,催化剂用量为DMC质量的0.03%。不同黏均相对分子质量的HPDMS硫化性能有较大差异,较低相对分子质量的HPDMS硫化成膜时间较短,且成膜后更柔软,表面更光滑,均匀性更高。但是低相对分子质量的聚合物成膜后较易被拉断。
Hydroxyl-terminated polydimethylsiloxane（HPDMS） was synthesized through ring opening reaction of dimethyl siloxane（DMC） under the catalysis of anion.The silicone elastomer was synthesized by coupling reaction between HPDMS and tetraethyl orthosilicate（TEOS） with dibutyl tin dilaurate（DBTDL） as catalyst.The effects of different ring-opening reaction conditions on the viscosity of HPDMS and the vulcanization of HPDMS with different molecular weight were investigated.The results showed that the temperature of ring-opening polymerization of DMC was above 80 ℃.The optimal conditions of the synthesis of HPDMS by anionic polymerization were： reaction temperature was 120 ℃,reaction time was 80 min,catalyst content was 0.03%（w/w）.The vulcanization properties of HPDMS with different viscosity-average molecular weight were quite different.Low molecular weight HPDMS had short vulcanization time and the film obtained was more flexible with more smooth surface and higher uniformity.However,it was more easily to be broken.
出处
《化学工业与工程》
CAS
2011年第6期17-21,共5页
Chemical Industry and Engineering
基金
教育部新世纪优秀人才支持计划(NECT-08-0820)
中央高校基本科研业务费专项资金资助(2010ZT09
SWJTU09CX062)
成都尤耐复合材料有限公司资助项目(2008H011442
009H01188
2010H01290)
关键词
DMC
弹性体
黏度
影响因素
DMC
elastomers
viscosity
influencing factors
