Abstract
Products in hydrolysis of (4-substituted phenyl)trimethoxysilane in the presence of benzyltrimethylammonium hydroxide in benzene was studied by matrix-assisted laser desorption/ionization-time of flight mass spectroscopy. In the benzene soluble fraction of 4 h reaction, oligosilsesquioxanes containing 6 to 9 silicon atoms with or without loops were observed. (4-Dimethylaminophenyl)trimethoxysilane gave the fraction containing 6 silicon atoms the least (3%), and 9 silicon fraction the most (36%). Oligosilsesquioxanes containing 9 silicon atoms were formed the least among the products for [4-methoxy- (10%), 4-methyl- (22%), non- (3%), and 4-phenyl- (13%) substituted phenyl]trimethoxysilanes. Oligosilsesquioxanes containing 6 to 8 silicon atoms were the major components of the product irrespective of the substituent. Maximum degree of condensation (f) was 0.8 for S8, and fully condensed structure was not found. The maximum f=1.00, and completely closed loop was found in S9 with one OH group remaining.
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Pakjamsai, C., Kawakami, Y. Tendency of Loop Formation of Oligosilsesquioxanes Obtained from (4-Substituted phenyl)trimethoxysilane Catalyzed by Benzyltrimethylammonium Hydroxide in Benzene. Polym J 36, 455–464 (2004). https://doi.org/10.1295/polymj.36.455
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DOI: https://doi.org/10.1295/polymj.36.455
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