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Journal of Materials Science

, Volume 30, Issue 7, pp 1709–1714 | Cite as

Diffusion of styrene-acrylonitrile copolymers

  • E. Kim
  • E. J. Kramer
  • P. D. Garrett
  • R. A. Mendelson
  • W. C. Wu
Papers

Abstract

Tracer diffusion coefficient, D*, and the Newtonian zero shear-rate viscosity, η0, were measured for a high molecular weight random copolymer (SAN) of styrene and acrylonitrile. As predicted by the reptation model, D*was in agreement with the molecular-weight scaling of M w −2 (Mw is the weight average molecular weight of the chain being probed) and was independent of matrix molecular weight. η0 showed a molecular-weight scaling of M W 3.4 . While the temperature dependence of these two relaxation processes could be well explained by the free-volume model up to 252 °C, they showed a discrepancy in activation enthalpy, Ea, of about 20%, with a larger value for diffusion.

Keywords

Enthalpy Diffusion Coefficient Styrene High Molecular Weight Relaxation Process 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • E. Kim
    • 1
  • E. J. Kramer
    • 1
    • 2
  • P. D. Garrett
    • 3
  • R. A. Mendelson
    • 3
  • W. C. Wu
    • 3
  1. 1.Department of Chemistry, Baker LaboratoryCornell UniversityIthacaUSA
  2. 2.The Chemical Group of Monsanto CompanySpringfieldUSA
  3. 3.Department of Chemical EngineeringPrinceton UniversityPrincetonUSA

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