Chem. Mater. 1991, 3, 201-206
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Molecular Level Ceramic/Polymer Composites. 2.1 Synthesis of Polymer-Trapped Silica and Titania Nanoclusters Manish Nandi,2a Jeanine A. Conklin,23 Lawrence Salvati, Jr.,2b and Ayusman Sen*,2a Chandlee Laboratory, Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, and Perkin-Elmer Physical Electronics Laboratory,
Edison, New Jersey 08820 Received October 17, 1990
The concept of “site isolation” was used to synthesize Si02 and Ti02 nanoclusters trapped in polyimide matrices. M(OEt)4 (M = Si, Ti) was added to polyamic solutions derived from 4,4'-oxydianiline and either 1,2,4,5-benzenetetracarboxylic acid dianhydride or 3,.3',4,4'-benzophenonetetracarboxylic acid dianhydride. Following thermal curing, polyimide films containing a homogeneous dispersion of Si02 or Ti02 particles were obtained. Oxide nanoclusters (size
