Positron Annihilation Studies of Interpenetrating Polymer Networks

Abstract

Positron annihilation lifetime spectroscopy was used to study thermal response and isothermal relaxation in two different molecular weight polystyrene samples over the temperature range of -20 C to 120 C. The lifetime and intensity of the ortho-positronium pickoff component were observed to vary systematically as a function of time, temperature, and molecular weight. A glas transition and secondary transition were detected in the thermal response data for both samples. PALS was also used to study the effects of physical crosslink density on free volume relaxation in polystyrene and polystyrene based interpenetrating polymer networks. The intensity of the o-Ps pickoff component was observed to vary in a consistent and predictable manner as a function of time, temperature, and crosslink density.

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Document Details

Document Type
Technical Report
Publication Date
Aug 23, 1989
Accession Number
ADA212162

Entities

People

  • Andrew Crowson
  • Annand D. Kasbekar
  • Phillip L. Jones

Organizations

  • Duke University

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Dielectric Polymers
  • Engineering
  • Intensity
  • Materials
  • Materials Engineering
  • Materials Science
  • Mechanical Properties
  • Military Research
  • Molecular Weight
  • Polymers
  • Polystyrenes
  • Positronium
  • Positrons
  • Resins
  • Transition Temperature
  • Transitions

Readers

  • Polymer Science and Engineering.
  • Solar Physics