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Dynamic light scattering study of a 1,4-isoprene-b-styrene copolymer

  • A. K. Rizos
  • G. Fytas
  • J. E. L. Roovers
  • K. L. Ngai
Chapter
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 91)

Abstract

Local optical anisotropy fluctuations within polystyrene (PS)-rich region in a disordered 1,4-isoprene-b-styrene (PI-b-PS) copolymer with XN≈5.3 (N=44) and glass transition temperature T g=13°C were analyzed by photon correlation spectroscopy (PCS) over a broad time range (10−7−103 s). There is strong experimental evidence that composition fluctuations in the present system can affect the segmental orientational fluctuations of the two foreign blocks. The significant broadening of the distribution of orientation times with decreasing temperature toward T g can be rationalized in terms of the coupling scheme of relaxation.

Key words

Diblock copolymers dynamic light scattering concentration fluctuations coupling model 

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1993

Authors and Affiliations

  • A. K. Rizos
    • 3
  • G. Fytas
    • 3
  • J. E. L. Roovers
    • 1
  • K. L. Ngai
    • 2
  1. 1.National Research Council of CanadaOttawa
  2. 2.Naval Research LaboratoryWashington, DCUSA
  3. 3.Foundation for Research and Technology HellasHeraklion CreteGreece

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