含氢聚硅氧烷序列结构的控制研究  

Control Study of the Sequence Structure of the Polyhydrosiloxane

作　　者：梁作强[1] 陈志荣[1] 尹红[1] 袁慎峰[1] 

机构地区：[1]浙江大学化学工程与生物工程学院,浙江杭州310027

出　　处：《化学反应工程与工艺》2016年第3期277-281,288,共6页Chemical Reaction Engineering and Technology

基　　金：浙江省重点科技创新团队计划资助(2011R50007)

摘　　要：为方便研究含氢聚硅氧烷的硅氢加成反应及其构效关系,需知道含氢聚硅氧烷链节的微观排布状况,本研究通过对聚合物链节序列长度的计算公式进行修改和补充,定义分散度（η）的概念并分析调聚过程中聚合物链节的排布。使用调聚法合成低含氢聚硅氧烷,研究了催化剂用量、反应温度和和搅拌转速等条件对调聚过程中聚合物含量和分散度的影响。结果表明：调聚过程包含聚合平衡和-Si（CH_3）H-O-（D_H）链节分散平衡两个过程,聚合平衡远远快于D_H分散平衡。温度为65℃时,聚合反应在2~3 h内达到平衡,D_H分散平衡则需要8 h甚至更长。增加催化剂用量、升高温度、增大搅拌转速均有利于两个平衡过程的进行。催化剂用量为5%,搅拌转速为400 r/min,温度65℃时,分散度最高为0.805。Polyhydrosiloxane is an important chemical intermediate applied on synthesis of many kinds of modified silicone oil.To facilitate the study of polysiloxane hydrosilylation and their property-structure relationships,there is a need to know the microstructure of polyhydrosiloxane.Polyhydrosiloxane were synthesized via telomerization and a parameter dispersion degree（η） was defined to characterize the microscopic structure of polymer sequence by modifying the formula of polymer sequence length in this study.The reactions were carried out under conditions of different catalyst loading,temperature and agitation speed to investigate their effects on dispersion degree and proportions of polymer.The results show that the process consists of polymerization-equilibrium and-Si（CH_3）H-0-（D_H） link distribution-equilibrium and the former shows a faster rate.At 65℃,the polymerization reaches equilibrium within 2-3 h while 8 h or even longer is required for the DH distribution equilibrium.The two equilibriums are favored with the increase of the catalyst loading,temperature and agitation speed.The dispersion degree can be as high as 0.805 with the catalyst loading being 5%,temperature 65℃,and agitation speed 400 r/min.

关 键 词：含氢聚硅氧烷 分散度 序列结构 

分 类 号：TQ264.1[化学工程—有机化工]