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Preparation of Well Defined Polystyrene-Block-Poly (Methylphenylsilylene) Copolymers

Eric Fossum,Krzysztof Matyjaszewski-1994-06-30-Defense Technical Information Center (DTIC)
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TL;DRAbstract

Combination of the living anionic polymerization of styrene with the ring opening polymerization of cyclotetrasilanes affords the preparation of well-defined polystyrene-block-poly(methylphenylsilylene). Block copolymers with ratios of polystyrene to polysilylene, PS:PMPS ranging from 1:4 to 2:1 have been prepared. The molecular weight distributions are narrow, M(w)/M(n)= 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.

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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-poly(methylphenylsilylene). Block copolymers with ratios of polystyrene to polysilylene, PS:PMPS ranging from 1:4 to 2:1 have been prepared. The molecular weight distributions are narrow, M(w)/M(n)= 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.

Keywords

PolystyreneCopolymerPolymer chemistryGel permeation chromatographyStyrenePolymerizationDifferential scanning calorimetryMaterials science

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