期刊
MACROMOLECULAR SYMPOSIA
卷 196, 期 -, 页码 301-325出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/masy.200390170
关键词
cyanate esters methyl methacrylate resins; epoxy resins; hybrid nanocomposites; phenolic resins; poly(dicyclopentadiene); polyhedral oligomeric silsesquioxanes; styrenedivinylbenzene; vinyl esters
The incorporation of both monofunctional and multifunctional polyhedral oligomeric silsesquioxane (POSS) derivatives into crosslinked resins has been conducted as a route to synthesize hybrid organic/inorganic nanocomposites. The central cores of POSS molecules contain an inorganic cage with (SiO1.5)(n) stoichiometry where n=8,1 0 and 12. Each Si atom is capped with one H or R function giving an organic outer shell surrounding the nanometer-sized inorganic inner cage. By including polymerizable functions on the R groups, a hybrid organic/inorganic macromer is obtained which can be copolymerized with organic monomers to create thermoplastic or thermoset systems. We have focused on incorporating POSS derivatives into crosslinking resins of the following types: (1) dicyclopentadiene (2) epoxies (3) vinyl esters (4) styrene-DVB (5) MMA/1,4-butane dimethacrylate (6) phenolics and (7) cyanate esters. One goal has been to determine if molecular dispersion of the POSS macromers has been achieved or if various degrees of aggregation occur during crosslinked resin formation. As network formation proceeds, a kinetic race between POSS molecular incorporation into the network versus phase separation into POSS-rich regions (which then polymerize) occurs. Ultimately, we hope to determine the effects of such microstructural features on properties. Combustion of these hybrids creates a SiO2-like surface layer that retards flame spread. Dynamic mechanical properties have been studied.
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