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Preparation of Well Defined Polystyrene-Block-Poly (Methylphenylsilylene) Copolymers
CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF CHEMISTRY
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Combination of the living anionic polymerization of styrene with the ring opening polymerization of cyclotetrasilanes affords the preparation of well-defined polystyrene-block-polymethylphenylsilylene. Block copolymers with ratios of polystyrene to polysilylene, PSPMPS ranging from 14 to 21 have been prepared. The molecular weight distributions are narrow, MwMn 1.3. Removal of any homo polystyrene can be accomplished by precipitation into acetone yielding pure block copolymers with known compositions. The materials have been characterized by 1H and 29Si NMR spectroscopy, Gel Permeation Chromatography, and Differential Scanning Calorimetry.
APPROVED FOR PUBLIC RELEASE