Properties of Polystyrene-Polydimethylsiloxane Block Copolymers

  • John C. Saam
  • F. W. Gordon Fearon
Conference paper


Block copolymers of polystyrene and polydimethyIsiloxane formed when hexamethylcyclotrisiloxane polymerized from the “living” ends of polystyryllithium. Little of the complicating intra- or intermolecular chain scission usually encountered in anionic siloxane polymerization occurred and essentially pure block copolymers were obtained. These were of the AB or BAB variety (where B signifies polydimethyIsiloxane and A polystyrene) depending on the functionality of the alkyllithium initiator used in formation of the polystyryHithium. The block copolymers, owing to the disparity in solubility between the A and B blocks, showed a tendency to form microphases in the bulk. The BAB block copolymers upon conversion to (BAB)X multi-block systems gave strong thermoplastic elastomers which could be deposited as films from solution or directly molded without any added re-enforcing fillers or cross-linking. Micro- phase formation was also observed in the multi-block copolymers.


Block Copolymer Yield Break Thermoplastic Elastomer Discontinuous Phase Selective Solvent 
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Copyright information

© Plenum Press, New York 1971

Authors and Affiliations

  • John C. Saam
    • 1
  • F. W. Gordon Fearon
    • 1
  1. 1.Polymer Research LaboratoriesDow Corning CorporationMidlandUSA

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