Accession Number:

ADA371493

Title:

The Aging Process in Polymers, Positron Annihilation Lifetime Studies

Descriptive Note:

Final rept.

Corporate Author:

CASE WESTERN RESERVE UNIV CLEVELAND OH

Personal Author(s):

Report Date:

1999-11-01

Pagination or Media Count:

8.0

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.

Subject Categories:

  • Polymer Chemistry
  • Nuclear Physics and Elementary Particle Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE