Cagelike Precursors of High-Molar-Mass Silsesquioxanes Formed by the Hydrolytic Condensation of Trialkoxysilanes

摘要: High-molar-mass silsesquioxanes (SSQO) based on (3-glycidoxypropyl)trimethoxysilane (GPMS) and (3-methacryloxypropyl)trimethoxysilane (MPMS) were synthesized. The hydrolytic condensation of GPMS was performed using HCOOH (0.1 N) as catalyst, keeping the molar ratio H2O/Si = 3. A first step in tetrahydrofuran (THF) at 50 °C, followed by a second diglycidyl ether bisphenol (DGEBA), where temperature increased steps up to 140 °C. MPMS bulk with 98%, T or 70 ratios HCOOH/Si 3 6. Homogeneous solutions obtained for both silanes. reaction size exclusion chromatography (SEC), final products characterized matrix-assisted ultraviolet laser desorption/ionization time-of-flight mass spectrometry (UV-MALDI-TOF MS), FTIR, 1H 29Si NMR. Molar-mass distributions showed presence clusters corresponding formed different generations. With the...