• 作者： 揚美惠、劉信旺、林欣佐
• 作者服務機構： Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, R.O.C.
• 中文摘要： A series of phenyl modified polydimethylsiloxane (PDMS) / polyhydrogenmethylsiloxane (PHMS) random copolymers containing both internal Si-H and terminal SiH2 and T (MeSiO3/2) units was synthesized in one step through n-BuLi-catalyzed ring-opening polymerization of cyclic comonomers and characterized by GPC, IR and 1H and 29Si NMR. Sequential microstructures of these copolymers were determined by 29Si-NMR spectroscopy. Epoxy-modified polysiloxanes were prepared and used as comparable standards for the assignment of the NMR spectra. A hydride-transfer mechanism has been proposed to account for the formation of terminal Si-H and T group. Detailed sequential analyses and chemical shifts of 29Si-NMR for various siloxane units are reported for the first time.
• 英文摘要： --
• 中文關鍵字： Phenylsiloxane copolymers; 29Si-NMR; Hydride-transfer; Thermal properties; Refractive index.
• 英文關鍵字： --