'Inverse' Organic-Inorganic Composite Materials. 2. Free-Radical Routes intoNonshrinking Sol-Gel Composites

摘要

The synthesis of optically-transparent, simultaneous interpenetrating network(SIPN) composites through the synchronous formation of both the inorganic and organic components is reported. This is accomplished by the hydrolysis and condensation of tetraalkenyl orthosilicates (the sol-gel process) to form an inorganic SiO2 matrix while simultaneously eliminating unsaturated alcohols which are polmerized in situ using free radical techniques. This simultaneous approach utilizing polymerizable alkoxides circumvents the insolubility problem often associated with organic polymers in the sol-gel precursor solutions, while at the same time eliminates the ubiquitous shrinkage problem associated with drying of sol-gel derived xerogel materials. Interpenetrating networks; organic-inorganic composites, sol-gel.