Synthesis and Characterization of Flame Retarding UV-Curable OrganicInorganic Hybrid Coatings

Official URL: http://www3.interscience.wiley.com/cgi-bin/abstract/112732504/ABSTRACT

UV-curable, organicinorganic hybrid materials were synthesized via solgel reactions for tetraethylorthosilicate, and methacryloxypropyl trimethoxysilane in the presence of the acrylated phenylphosphine oxide resin (APPO) and a bisphenol-A-based epoxy acrylate resin. The solgel precursor content in the hybrid coatings was varied from 0 to 30 wt %. The adhesion, exibility, and hardness of the coatings were characterized. The inuences of the amounts of inorganic component incorporated into the coatings were studied. Results from the mechanical measurements show that the properties of hybrid coatings improve with the increase in solgel precursor content. In addition, thermal properties of the hybrids were studied by thermogravimetric analysis in air atmosphere. The char yield of pure organic coating was 32% and that of 30 wt % silicate containing hybrid coating was 30% at 5008C in air atmosphere. This result demonstrates the pronounced effect of APPO on the ame retardance of coatings. Gas chromatography/mass spectrometry analyses showed that the initial weight loss obtained in thermogravimetric analysis is due to the degradation products of the photoinitator and the reactive diluent.