Influence of Morphology on the Viscoelastic Behavior of a Solvent-Cast S-B-S Block Copolymer

  • M. Shen
  • E. H. Cirlin
  • D. H. Kaelble


It has recently been demonstrated in the literature that styrene block copolymers give rise to different morphological structures depending on the condition of sample preparation. Thus polymers cast from benzene will have a butadiene-continuous matrix in which are embedded polystyrene regions. On the other hand, methyl ethyl ketone/tetrahydrofuran mixture will render the sample styrene-continuous. In this work we have carried out stress-relation measurements on Kraton 101 over an extended temperature range (-150°C to 100°C). Viscoelastic master ciirves were constructed that cover 25 decades of time (in seconds). It is found that the MEK/THF cast samples possess considerably higher modulus than the benzene cast samples above the glass transition temperature. The shift factors utilized to effect time-temperature superposition do not follow the classical Williams-Landel-Ferry equation. Those for the benzene-cast block copolymer can be fitted to a modified WLF equation for a multiphase system. But those for the MEK/THF-cast ones cannot be adequately described by either of these equations. In addition, the presence of plasticizer is found to affect the viscoelastic behavior of the benzene-cast block copolymers in an unique manner. A model based on the possible morphological structures of these samples is introduced to explain the observed phenomena.


Glass Transition Temperature Block Copolymer Viscoelastic Behavior Master Curve Shift Factor 
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Copyright information

© Plenum Press, New York 1971

Authors and Affiliations

  • M. Shen
    • 1
  • E. H. Cirlin
    • 2
  • D. H. Kaelble
    • 2
  1. 1.Dept. of Chem. Eng.University of CaliforniaBerkeleyUSA
  2. 2.Science CenterNorth American Rockwell CorporationThousand OaksUSA

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