The Synthesis and Dilute Solution Properties of Styrene-Siloxane ABA Block Copolymers

  • W. G. Davies
  • D. P. Jones
Conference paper


Narrow molecular weight distribution \(\left( {{{{{\bar M}_w}} \mathord{\left/ {\vphantom {{{{\bar M}_w}} {{{\bar M}_n}}}} \right. \kern-\nulldelimiterspace} {{{\bar M}_n}}} \sim 1.3} \right)\) polystyrene (A)-polydimethylsiloxane (B) ABA block copolymers have been prepared using anionic polymerisation techniques. These copolymers are structurally similar to polystyrene-polybutadiene block copolymers, as they possess well-defined block segments. The narrowness of their molecular weight distribution has been confirmed by direct measurement of \({\bar M_w}\) and \({\bar M_n}\) and by gel permeation chromatography. Light scattering, using the Benoit and Krause approach to copolymer solutions, osmometry and viscometry have been used to study the molecular parameters of these block copolymers. The evidence from both light scattering and viscometry suggests that the preferred configuration of the copolymers in solution is that of randomly interpenetrating coils.


Block Copolymer Molecular Weight Distribution Number Average Molecular Weight Narrow Molecular Weight Distribution Zimm Plot 
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Copyright information

© Plenum Press, New York 1971

Authors and Affiliations

  • W. G. Davies
    • 1
  • D. P. Jones
    • 1
  1. 1.Midland Silicones LimitedBarry, GlamorganUK

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