Monitoring of the Sol-Gel Synthesis ofOrganic-inorganic Hybrids by FTIR Transmission,FTIR/ATR, NIR and Raman Spectroscopy

摘要

The sol-gel synthesis of organic-inorganic hybrids based on triethoxysilane-terminated poly(ethylene oxide) and tetraethylorthosilicate was monitored in-situusing three spectroscopic methods (FTIR/ATR, Raman, NIR). These spectroscopicmethods allow in-situ monitoring of the evolution of hybrid materials starting fromthe modification of the polymer and the early steps of hydrolysis up to the networkformation. By application of 'Si solid-state NMR spectroscopy the assignment andquantification of the Raman bands to different end groups and different cross-linkingstates was made. The sol-gel reaction was also followed by in-line NIR spectroscopy.A multivariate data analysis was accomplished to obtain a conversion-time curve.Furthermore, we investigated spin-coated films on wafers using FTIR transmissionspectroscopy.