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Einfluss der Sorte eines Silans auf dessen Reaktionsgeschwindigkeit bei Oberflächenbehandlung und Tiefenimprägnierung unterschiedlicher Untergründe by H. De Clercq is a scholarly article available to read on EtoBox.

What is Einfluss der Sorte eines Silans auf dessen Reaktionsgeschwindigkeit bei Oberflächenbehandlung und Tiefenimprägnierung unterschiedlicher Untergründe about?

A study of the reactivity of silicon based model compounds was carried out on different substrates. Previous studies with similar compounds showed that the polymerization is mainly influenced by the type of substrate while reaction conditions are not as critical. This paper focuses on the influence of the type of bonding group, as well as hydrophobic group, of silanes on their performance when applied to limestone, sandstone and brick. Due to the complex nature of commercial products and the presence of cross-linking agents, model compounds were selected to allow a quantitative evaluation of the polymerizing mixture. The results showed that chemical reactivity with the substrate is mainly obtained in the case of brick and limestone with methoxy functionalized silanes rather than ethoxy ones. Higher alkyl groups decrease the vapour pressure of alkoxy functionalized silanes resulting in an increased mass return which is characterized by a decreased reactivity of the bonding groups and an increased amount of polycondensated silanes by intermolecular reaction of silanols.

Author

H. De Clercq

Publisher

Walter de Gruyter GmbH

Published

2008

Language

DE