Synthesis and Characterization of Base‐catalyzed Phenyl Modified PDMS/PHMS Copolymers |
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Authors: | Mei‐Hui Yang Hsin‐Wang Liu Hsin‐Tso Lin |
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Abstract: | 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. |
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Keywords: | Phenylsiloxane copolymers 29Si‐NMR Hydride‐transfer Thermal properties Refractive index |
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