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Process for Preparation of Polyhedral Oligomeric Silsesquioxanes and Systhesis of Polymers Containing Polyhedral Oligomeric Silsesquioxane Group Segments.


pdf icon Process for Preparation of Polyhedral Oligomeric Silsesquioxanes and Systhesis of Polymers Containing Polyhedral Oligomeric Silsesquioxane Group Segments. (908 K)
Lichtenhan, J. D.; Gilman, J. W.; Feher, F. J.

U.S. Patent 5,484,867; 8 p. January 16, 1996.

Keywords:

polyhedral oligomeric silsesquioxanes; synthesis

Abstract:

A process for preparation of reactive polyhedral oligomeric silsesquioxanes and the subsequent synthesis of polysilsesquioxanes which produce high yield, tractable polymers containing silsequioxane segments is provided. A trifunctional polyhedral oligomeric silsesquioxane of the formula Si7R7O9(OA)3 is corner capped by reacting it with a compound of the formula M-Z to form a polyhedral oligomeric silsesquioxane which can be reacted in various ways with oligomers, polymers, catalysts, or co-monomers to form polyhedral silsesquioxane polymers containing silsesquioxanes as pendant, block, or end group segments. The resulting polymers are essentially free of impurities and have controllable properties through the proper selection of the synthesis process and starting materials.