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 刘琰 张兴文 张皓 作者单位： 尤宏,刘琰,张兴文(Dept. of Environmental Engineering, Harbin Institute of Technology, Harbin 150001, China)胡立江,张皓(Dept. of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China)
刊 名： 哈尔滨工业大学学报(英文版) EI 英文刊名： JOURNAL OF HARBIN INSTITUTE OF TECHNOLOGY(NEW SERIES) 年，卷(期)： 2003 10(3) 分类号： X707 关键词： molar mass distribution hydrolytic condensation cage and ladder structure