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


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.


Enthalpy Diffusion Coefficient Styrene High Molecular Weight Relaxation Process 
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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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