硅烷
硅醇
硅烷
化学
水解
烷氧基
缩合反应
核磁共振波谱
冷凝
烯酮
碳-13核磁共振
有机化学
催化作用
烷基
物理
热力学
作者
Marie-Christine Brochier Salon,Ariane Bayle,Makki Abdelmouleh,Sami Boufi,Mohamed Naceur Belgacem
标识
DOI:10.1016/j.colsurfa.2007.06.028
摘要
The hydrolysis of four alkoxy-silane coupling agents, 3-methacryloxypropyl trimethoxy silane (MPMS), 3-mercaptopropyl trimethoxy silane (MRPMS), octyl triethoxy silane (OES) and 3-aminopropyl triethoxy silane (APES) was carried out in an ethanol/water 80/20 (w/w) solution under acidic, alkaline and neutral conditions and followed by 1H, 13C and 29Si NMR spectroscopy. It was found that the kinetic rate of the hydrolysis of the silanes under neutral conditions was very low, except for APES, which displayed the fastest reaction speed. The addition of TEA catalyzed both silane hydrolysis and self condensation reactions. Acidic conditions enhanced the hydrolysis and the ensuing silanol entities were quite stable. In fact, these conditions slowed down the rate of the self condensation reactions, as deduced from in situ 1H and 13C NMR. Thanks to in situ 29Si NMR spectroscopy, the nature of the intermediary species versus reaction time was established.
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