| Summary: | 碩士 === 國立中央大學 === 化學工程研究所 === 89 === ABSTRACT
Coatings were prepared from a suspension of colloidal silica particles containing Glycidoxypropyltrimethoxysilane(GPS) and tetraethoxysilane(TEOS).The added to an aqueous silica or boeh-mite suspension.Acidic conditions relsulted in slower condensa-tion which allowed adsorption of the silane on Boehmite and Silica.Coatings with GPS modification were denser,adhered better to the polymer substrate,and could be made ticker than unmodified silica coatings.In general have to take place in organic solvents in order to control the hydrolysis and conden-sation reaction.This leads to drawbacks in applications,since
the organic solvent vapor concentration has to be controlled for example in coating applications for environmental,health or security reasons.For this reason,a reaction route has been develop to produce coating precursors stable against water as solvent.
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