Cage and ladder structures of silsesquioxanes characterized by UV-MALDI-TOF mass spectrometry

The molar mass distribution of SSO in the first generation derived from the hydrolytic condensation oftwo trialkoxysilanes, [ 3- ( Methacryloxy ) propyl ] trimethoxysilane ( MPMS ) and vinyltrimethoxysilane ( VMS ) ,are determined by UV-MALDI-TOF MS. The comparisons of theoretical masses with experimental masses arecalculated using the proposed compounds, which are assigned to formulas Tn (OH)m, Tn (OMe)y orTn(OH)x(OMe)y[T=RSiO1.5 (x+y)/2n, R=--(CH2)3OOCCH(CH3)CH2 and--CHCH2]. Both theproposed cage and ladder structures of SSO derived from similar sol-gel process of monomers are illustrated. Thecauses for the difference in structures between SSO M and SSO V is discussed as well.

作 者： 尤宏 胡立江 劉琰 張興文 張皓   作者單位： 尤宏,劉琰,張興文(Dept. of Environmental Engineering, Harbin Institute of Technology, Harbin 150001, China)

胡立江,張皓(Dept. of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China) 

刊 名： 哈爾濱工業大學學報(英文版)  EI 英文刊名： JOURNAL OF HARBIN INSTITUTE OF TECHNOLOGY(NEW SERIES)  年，卷(期)： 2003 10(3)  分類號： X707  關鍵詞： molar mass distribution   hydrolytic condensation   cage and ladder structure