Three series of hyperbranched (HB) polycarbosiloxanes and HB polysiloxanes were prepared from octa-functional polyhedral oligomeric silsesquioxane (POSS) monomers and various difunctional silanes in non-linear bi-molecular A8-B2 polymerizations, and were characterized by IR, 1H NMR, 29Si NMR, SEC, DSC and for refractive index.  Series 1 was prepared from T8vinyl8 and disilane monomers and series 2 was prepared from T8(OSiMe2H)8 and divinylsilane monomers, both via platinum-catalyzed hydrosilylation polymerization.  Series 3 was prepared from T8(OSiMe2OH)8 and dichlorosilane monomers via hydrolysis-condensation polymerization.  Structure-property relationships were determined as methyl vs. phenyl content was varied.  These HB POSS copolymers were then functionalized with curable alkoxysilane end-groups, and used as precursors to transparent nanostructured POSS coatings, films, and adhesives for application in a range of high performance space and solar applications.

Hyperbranched polycarbosiloxanes and polysiloxanes from octafunctional Polyhedral Oligomeric Silsesquioxane (POSS) monomers

243rd National Meeting (2012)

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