Please use this identifier to cite or link to this item: doi:10.22028/D291-24372
Title: Modelling of ORMOCER coatings by processing
Author(s): Nass, Rüdiger
Arpac, Ertugrul
Glaubitt, Walther
Schmidt, Helmut K.
Language: English
Year of Publication: 1990
OPUS Source: Journal of non-crystalline solids. - 121. 1990, 1/3, S. 370-374
SWD key words: Ormocer
Substrat <Chemie>
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: Hydrolysis, condensation and polymerization of &gamma;-glycidyloxipropyltrimethoxysilane was studied under different reaction conditions and yields a hard coating material for polyethyleneterephthalate substrates. The progress of hydrolysis was followed by 29Si-NMR spectroscopy and Karl Fischer filtration. Hydrolysis proceeds very slowly at pH 5.5, but can be enhanced at pH 9. Independent from submitted water and pH the solutions only one half of hydrolyzable methoxy groups can be removed. Condensation and polymerization were investigated on coated substrates and start during thermal curing. The formation of the polysiloxane network takes place by elimination of methanol. Polymerization of the epoxy groups to polethyleneoxide units is achieved above 100°C using a special catalyst. The properties of the cured coatings depend on the free water and glycol content in the solution. Minimizing the amount of both components leads to an ORMOCER coating on polyethyleneterephthalate which features a good abrasion resistance in combination with a high flexibility.
Link to this record: urn:nbn:de:bsz:291-scidok-26683
Date of registration: 29-Jan-2010
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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