Cyclization phenomena in the sol-gel polymerization of α, ω-bis (triethoxysilyl) alkanes and incorporation of the cyclic structures into network silsesquioxane polymers

…, R Shaltout, PK Dorhout, J Greaves…

Index: Loy, Douglas A.; Carpenter, Joseph P.; Alam, Todd M.; Shaltout, Raef; Dorhout, Peter K.; Greaves, John; Small, James H.; Shea, Kenneth J. Journal of the American Chemical Society, 1999 , vol. 121, # 23 p. 5413 - 5425

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Citation Number: 76

Abstract

Intramolecular cyclizations during acid-catalyzed sol-gel polymerizations of α, ω-bis (triethoxysilyl) alkanes substantially lengthen gel times for monomers with ethylene (1), propylene (2), and butylene (3) bridging groups. These cyclization reactions were found, using mass spectrometry and 29Si NMR spectroscopy, to lead preferentially to monomeric and dimeric products based on six-and seven-membered disilsesquioxane rings. 1, 2-Bis ...