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

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


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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  1. 1.
    Leibler L (1980) Macromolecules 13:1602CrossRefGoogle Scholar
  2. 2.
    Fredrickson GH, Helfand E (1987) J Chem Phys 87:697CrossRefGoogle Scholar
  3. 3.
    Bates FS, Fredrickson GH (1990) Ann Rev Phys Chem 41:525CrossRefGoogle Scholar
  4. 4.
    Stuhn B, Rennie AR (1989) Macromolecules 22:2460CrossRefGoogle Scholar
  5. 5.
    Kanetakis J, Rytas G (1991) J Non-Crystal Solids 131–133:823CrossRefGoogle Scholar
  6. 6.
    Kanetakis J, Rytas G, Hadjichristidis N (1991) Macromolecules 24:1806CrossRefGoogle Scholar
  7. 7.
    Gerharz B, Fischer EW, Fytas G (1991) Polym Commun (in press)Google Scholar
  8. 8.
    Kanetakis J, Fytas G, Kremer F, Pakula T (1991) Macromolecules (submitted)Google Scholar
  9. 9.
    Stuhn B, Rennie AR (1989) Macromolecules 22:2460CrossRefGoogle Scholar
  10. 10.
    Roland CM, Ngai KL (1991) Macromolecules 24:2315; and in this volumeGoogle Scholar
  11. 11.
    Rizos AK, Ngai KL, Roland CM, Fytas G (in preparation)Google Scholar
  12. 12.
    Fytas G, Alig I, Rizos AK, Kremer F, Roovers JEL (in press)Google Scholar

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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