Analysis of the 3-Glycidoxypropyltrimethoxysilane (GPTMS) hydrolysis by infrared spectroscopy

ABSTRACT The study of silanes and polymers with special functions is increasing and the development of materials from silane-based polymers follows this trend. In this way, the hydrolysis of 3-Glycidoxypropyltrimethoxysilane (GPTMS) was studied as a function of the hydrolysis time in solutions with 50% of alcoholic solvents by infrared spectroscopy. It was verified that it was possible to analyze qualitatively and quantitatively the chemical reactions involving the hydrolysis / condensation of GPTMS and the main kinetics variations during the process. The results suggest that up to 30 minutes of hydrolysis, the predominant reactions are hydrolysis of the alkoxy groups, with the generation of the Si-OH groups and alcohol, in this case methanol. From 30 minutes, there is a large amount of silanols in the solution that tend to condense and form siloxane groups, which has this reaction accelerated from 60 minutes. Already, from 70-80 minutes, the reactions tend to decrease the kinetics, due to the absence of silanols and the hydrolysis / condensation process.

摘要：特种官能硅烷及聚合物的研究热度与日俱增，硅基聚合物基材料的研发亦顺应这一趋势。为此，本研究采用红外光谱法，探究了50%醇溶剂体系中3-缩水甘油醚氧基丙基三甲氧基硅烷（3-Glycidoxypropyltrimethoxysilane，GPTMS）的水解反应随水解时长的变化规律。研究证实，可通过该表征手段对GPTMS水解/缩合相关化学反应及过程中的主要动力学变化实现定性与定量分析。结果表明，水解时长不超过30分钟时，主导反应为烷氧基水解，同时生成硅羟基（Si-OH）与甲醇；水解时长超过30分钟后，体系中生成大量硅醇，进而发生缩合反应形成硅氧烷基团，且该缩合反应在60分钟后进一步加速；当水解时长达到70~80分钟时，反应动力学速率趋于放缓，这是由于体系中硅醇耗尽，水解与缩合过程难以继续进行。