标题：Impacts of different functional groups on the kinetic rates of α-amine ketoximesilanes hydrolysis in the preparation of room temperature vulcanized silicone rubber
作者：Xu, Huihui ;Liu, Zihou ;Liu, Qingyang ;Bei, Yiling ;Zhu, Qingzeng
作者机构：[Xu, Huihui ;Liu, Zihou ;Bei, Yiling ;Zhu, Qingzeng ] Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, School of Chem 更多
摘要：α-Amine ketoximesilanes are proven to be effective crosslinkers in the preparation of ketone-oxime one-component room temperature vulcanized (RTV) silicone rubber without the use of toxic metal catalyst. This work aimed to investigate the hydrolysis kinetic of α-amine ketoximesilanes, which is vitally important for the preparation of RTV silicone rubber. Five kinds of α-amine ketoximesilanes, namely α-(N, N-diethyl)aminomethyltri(methylethylketoxime)silane (DEMOS), α-(N, N-di-n-butyl)aminomethyltri(methylethylketoxime)silane (DBMOS), α-(N-n-butyl) aminomethyltri(methylethylketoxime)silane (n-BMOS), α-(N-cyclohexyl)aminomethyltri (methylethylketoxime)silane (CMOS) and α-(β-aminomethyl)aminomethyltri(methylethylketoxime) silane (AEMOS), were successfully obtained and confirmed using Fourier transform infrared spectrometer (FT-IR) and hydrogen-1 nuclear magnetic resonance (1H NMR). Kinetics of hydrolysis reactions were measured by FT-IR and conductivity. Our results illustrated that the kinetic constant rates ranged from 12.2 × 10-4s-1to 7.6 × 10-4s-1, with the decreasing order of DEMOS > n-BMOS > DBMOS > CMOS > AEMOS at the given temperature and humidity. Better performances of thermal stability could be achieved when using the α-amine ketoximesilanes as crosslinkers in the preparation of RTV silicon rubber than that of RTV silicone rubber with the use of methyltri(methylethylketoxime)silane (MOS) as a crosslinker and organic tin as a catalyst.
© 2018 by the authors.