The use of LCMS as an analytical tool for hydrolysis/polycondensation monitoring of a chiral ORMOSIL precursor |
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| Authors: | Guy L Vautey T Le Luyer C Guy S |
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| Institution: | (1) Laboratoire de Chimie UMR 5182 CNRS/ENS, Ecole Normale Supérieure de Lyon 46, Allée d’Italie, 69364 Lyon Cedex 07, France;(2) Laboratoire de Physico-Chimie des Matériaux Luminescents UMR 5620, CNRS/UCBL Domaine Scientifique de la Doua, Université Claude Bernard Lyon 1, Batiment Alfred Kastler, 10 rue André-Marie Ampère, 69622 Villeurbanne Cedex, France |
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| Abstract: | The kinetic of the sol–gel hydrolysis and polycondensation reactions of a chiral ORMOSIL precursor was investigated by LCMS
technique as a function of water excess and pH. While the amount of water does not significantly change the kinetics, the
reactions strongly depend on the H]+ concentration. At pH ≤ 3, the hydrolysis is very fast and the conversion of the precursor is completed within less than 1
h whereas at 80% of the precursor is still present after 50 h at pH = 3.5. This kinetic study allows to define a set of initial
conditions and time ranges required to provide good optical quality dip coated films .
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| Keywords: | LCMS Hydrolysis Polycondensation Kinetic Thin films ORMOSIL Hybrid Chirality |
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