The Aging Process in Polymers, Positron Annihilation Lifetime Studies

Abstract

Our research effort on this project investigated the capability of positron annihilation lifetime (PAL) spectroscopy to characterize quantitatively the molecular-level structural disorder in the amorphous phase of polymer materials and to enhance our understanding of the relationships between molecular disorder and the functional properties of such materials. A particular interest was to characterize the change in free volume during isothermal annealing, which is the origin of the well-known physical aging effect in mechanical properties of polymeric glasses such as embrittlement.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1999
Accession Number
ADA371493

Entities

People

  • Alex M. Jamieson
  • John D. Mcgervey

Organizations

  • Case Western Reserve University

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Composite Materials
  • Dielectric Polymers
  • Diseases And Disorders
  • Embrittlement
  • Glass Transition Temperature
  • Macromolecules
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Mechanical Properties
  • Polymer Matrix Composites
  • Polymers
  • Positrons
  • Spectra
  • Spectroscopy
  • Transition Temperature

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.
  • Solar Physics