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Titel: Modelling of ORMOCER coatings by processing
Verfasser: Nass, Rüdiger
Arpac, Ertugrul
Glaubitt, Walther
Schmidt, Helmut K.
Sprache: Englisch
Erscheinungsjahr: 1990
Quelle: Journal of non-crystalline solids. - 121. 1990, 1/3, S. 370-374
SWD-Schlagwörter: Ormocer
Hydrolyse
Kondensation
Polymerisation
NMR-Spektrometer
NMR-Spektroskopie
Enzymsubstrat
Substrat <Chemie>
Siloxane
DDC-Sachgruppe: 620 Ingenieurwissenschaften und Maschinenbau
Dokumentart : Journalartikel
Kurzfassung: 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 zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-26683
hdl:20.500.11880/24428
http://dx.doi.org/10.22028/D291-24372
SciDok-Publikation: 29-Jan-2010
Fakultät: Sonstige Einrichtungen
Fachrichtung: SE - INM Leibniz-Institut für Neue Materialien
Fakultät / Institution:INM
SE - Sonstige Einrichtungen

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