Rheology pp 323-324 | Cite as

Relaxation Processes in Glassy Polymers and the Strain and Time Dependence of Gas Permeation

  • T. L. Smith
  • G. Levita


The viscoelastic properties of glassy polymers are known to be affected by volumetric relaxation whose rate, as reflected in certain properties, is accelerated by tensile deformations. To obtain additional information on molecular processes in such polymers, a study was made of the effect of ostensibly homogeneous deformations in simple tension on the effective permeability and diffusion coefficients (P and D) of gases in a biaxially oriented polystyrene film and, to some extent, in a polycarbonate film.


Free Volume Viscoelastic Property Tensile Deformation Effective Permeability Glassy Polymer 
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Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • T. L. Smith
    • 1
  • G. Levita
    • 2
  1. 1.IBM Research LaboratorySan JoseUSA
  2. 2.University of PisaItaly

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