色谱质谱联用技术研究30%二甲基二乙氧基硅烷/70%正硅酸乙酯复合醇盐的水解聚合行为

The Hydrolysis and Gellation Behavior Study of (CH_3)_2Si(OEt)_2/Si(OEt)_4 Composite Alkoxide by Gas Chromatogram/mass Spectrum Technique

采用色谱质谱联用技术研究了1种复合醇盐：30％二甲基二乙氧基硅烷／70％正硅酸乙酯（DDS／TEOS）的水解聚合过程，并由此分析了这两种有机-无机酸盐的相互作用机制和聚合方式，实验结果指出，DDS的添加抑制了TEOS的自聚合，使得体系中形成了大量的DDS的自聚合环状分子（（（CH3）2Si—O—）n）以及TEOS和DDS的共聚合高分子，由于后者对水解聚合的加速作用，使得30％DDS／70％TEOS系统具有最短的凝胶时间。

Gas chromatogram/mass spectrum technique was adopted to investigate the hydrolysis andcondensation processes of a composite alkoxide: 30 mol % DDS / 70mol % TEOS. The polymeerization behavior and interaction mechanisms of these two alkoxides were investigated according tothe GC/MS results. It was indicated that DDS suppresses the self-condensation of TEOS and asa result, a large amount of DDS derived cyclic ((CH3)2Si-O-)n molecules and co-condensationproducts of DDS with TEOS were formed in the reaction system. The co-polymerization of DDSwith TEOS accelerates the hydrolysis and condensation course, and thus a 30 mol% DDS/70mol% TEOS system possesses the shortest gellation time.