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. Keywords: GPTMS, hydrolysis, infrared spectroscopy, silane
Highlights
The utilization of metallic precursors for sol-gel systems production have been explored with more attention since the 50’s with the main objective of the formation of three-dimensional inorganic networks [1, 2]
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
When the silane comes in contact with water, the alkoxy groups start to hydrolyze, resulting in silanol (Si-OH) groups and by-products of the hydrolysis which are usually alcohols, commonly of the same composition as the solvent used for the dispersion of the silane, as suggested in Equation 1
Summary
The utilization of metallic precursors for sol-gel systems production have been explored with more attention since the 50’s with the main objective of the formation of three-dimensional inorganic networks [1, 2]. Alkoxysilanes are chemical compounds with molecules based on the silicon atom as the main element and that, in the majority of molecules, present two types of chemical interaction, present in it extremities, being one inorganic and the other organic They are generally referred by the hydrolysable group, the alkoxy type, and an organofunctional group (amine (-NH2), vinyl (-C=C), etc.). When the silane comes in contact with water, the alkoxy groups start to hydrolyze, resulting in silanol (Si-OH) groups and by-products of the hydrolysis which are usually alcohols, commonly of the same composition as the solvent used for the dispersion of the silane, as suggested in Equation 1 These silane groups have potential and are responsible for polycondensation, gel formation and, subsequently, formation of the inorganic three-dimensional network, as suggested in Equation 2
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