Ion Beam Analysis of Diffusion in Polymer Glasses

Abstract

Rutherford backscattering spectrometry (RBS) and forward recoil spectrometry (FRES) have been used to the fundamentals of Case II diffusion of organic molecules (solvent) into glassy polymers. These ion beam techniques were employed to measure the velocity V of the Case II diffusion front, the diffusion coefficient D of the solvent ahead of the front and the rate of swelling of the surface of the sample as well as the solvent diffusion profiles during the period before Case II diffusion has begun. Our results indicate that Case II diffusion results from a physico-chemically (osmotic pressure) driven yielding of the polymer glass analogous to the familiar mechanical yielding; the almost discontinuous increase in diffusion coefficient that accompanies the yielding accounts for the formation of the front. Keywords: Organic chemistry, Toluenes, Glass, Polymers.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 06, 1989
Accession Number
ADA212339

Entities

People

  • Edward J. Kramer

Organizations

  • Cornell University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Differential Equations
  • Diffusion
  • Diffusion Coefficient
  • Equations
  • Films
  • Ion Beams
  • Mass Transfer
  • Materials
  • Materials Science
  • Measurement
  • Molecules
  • Osmotic Pressure
  • Polymeric Films
  • Polymers
  • Spectrometry
  • Strain Rate

Readers

  • Materials Science and Engineering.
  • Polymer Science and Technology
  • Thin Film Deposition Science.