Preparation and characterization of organic/inorganic hybrid epoxy networks from reactive inorganic precursors

0376307 - ÚMCH 2013 RIV US eng J - Journal Article
Beneš, Hynek - Galy, J. - Gérard, J. F. - Pleštil, Josef - Valette, L.
Preparation and characterization of organic/inorganic hybrid epoxy networks from reactive inorganic precursors.
Journal of Applied Polymer Science. Roč. 125, č. 2 (2012), s. 1000-1011. ISSN 0021-8995. E-ISSN 1097-4628
Institutional research plan: CEZ:AV0Z40500505
Keywords : sol–gel * epoxy * silica
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 1.395, year: 2012

Organic/inorganic hybrid networks were prepared by a novel solvent-free two-step synthesis method. In the first step, prehydrolyzed–condensed reactive inorganic precursors (clusters) were prepared by a sol–gel process from monomeric alkoxysilanes with amino and glycido groups. The second step comprised their addition into epoxy resin and amine hardener, followed by the reaction of all components giving the final hybrid crosslinked materials. The morphology of the organic/inorganic hybrid structures formed from glycidoprecursor revealed spherical silica-rich domains forming agglomerates with diameter from 100 to 500 nm. The aminoprecursor led to large highly condensed and branched silicon-rich structures. The hybrid networks showed significantly improved thermomechanical properties and better resistance against thermooxidation when compared with the neat epoxy–amine network. Thin films as well as bulk materials were successfully prepared by this process.
Permanent Link: http://hdl.handle.net/11104/0006950