The Barrier Properties of Polyacrylonitrile.

Abstract

The permeabilities and time lag diffusivities have been determined in machine cast polyacrylonitrile films for helium, neon, argon, krypton, oxygen, nitrogen and carbon dioxide. Removing the last traces of residual solvent caused a slight reduction in the values, but the activation energies were unchanged. Separate high pressure sorption measurements showed that dual mode sorption was taking place. The permeabilties were remarkably low. The ratios of the permeabilities of helium to the other gases is remarkably high. This coupled with the rather low activation energies, suggests that one important reason for the excellent barrier properties of polyacrylonitrile is the very small size of the fluctuating free volume elements in this polymer. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1976
Accession Number
ADA033353

Entities

People

  • H. B. Hopfenberg
  • J. L. Williams
  • M. Fujii
  • S. M. Allen
  • V. Stannett

Organizations

  • North Carolina State University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acrylonitrile Polymers
  • Alkenes
  • Biomedical And Dental Materials
  • Carbon Dioxide
  • Diffusion
  • Dual Mode
  • Energy
  • Films
  • Glass
  • Glass Transition Temperature
  • Heat Of Activation
  • High Pressure
  • Measurement
  • Polymeric Films
  • Polymers
  • Transition Temperature
  • Water Vapor

Readers

  • Mathematics or Statistics
  • Molecular Photonics/Laser Physics
  • Polymer Science and Engineering.