摘要
以盐酸和三氟甲烷磺酸为催化剂;通过水解缩合反应制备了含苯基和乙烯基的MDT硅树脂,利用红外光谱和核磁对产物进行结构表征。探讨了不同取代基的反应单体在水解缩聚反应中反应速率的关系,并探讨了不同酸催化剂条件下对水解缩合反应的影响。研究表明:以苯基、甲基和乙烯基为取代基的单体在缩合反应阶段其反应速率基本保持一致;酸性条件下水解过程中主要反应为水对硅原子的亲核进攻过程;缩合过程是由硅羟基上的氧对带有质子的硅羟基分子中的硅原子进行亲核进攻。
The phenyl vinyl MDT silicone resin was synthesized by hydrolytic condensation reaction,in which hydrochloric acid and trifluoromethane sulfonic acid were used as catalysts respectively.The structure of product was characterized by FT-IR and ~1 H-NMR.The relationship between the reaction rate and substituent of reactants in the hydrolytic condensation reaction discussed,investigated the influence of different acid catalyst on the hydrolytic condensation reaction.As a result,in condensation reaction stage,the reaction rate was basic consistent no matter the substituent of reactive monomer were phenyl,methyl or vinyl.Under the condition of acid hydrolysis the main reaction process was silicon atoms nucleophilic attacked by water.On the condensation process the main reaction process was silicon atoms of Si—OH nucleophilic attacked by oxygen atoms of silanol group.
出处
《化工新型材料》
CAS
CSCD
北大核心
2017年第2期186-187,190,共3页
New Chemical Materials
关键词
MDT硅树脂
酸催化
水解缩合
反应机理
MDT silicone resin
acid catalysis
hydrolytic condensation
reaction mechanism
