A Water-Sensitive Thermomechanical Transition in a Polyimide.

Abstract

The effect of water vapor on a polyimide has been investigated in the temperature region -190 deg to 325 deg C using an automated torsion pendulum. A damping peak 'TH2O' develops at -122 C (1 Hz) in the thermomechanical spectra of the polymer which is due to water-polymer interactions. The peak intensifies as the humidity of the conditioning atmosphere, at both 30 C and at 325 C, increases and attains a limiting value at about 2000 ppm sub v H20. The process is reversible. It is concluded that the number of sites in the polymer for interaction with water is low and limited and, assuming direct proportionality between the intensity of the loss peak and the amount of water adsorbed, that the adsorption of water vapor follows the Langmuir isotherm. (MM)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1978
Accession Number
ADA304555

Entities

People

  • J. K. Gillham
  • R. H. Chow
  • Y. Ozari

Organizations

  • Princeton University

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Anhydrides
  • Chemical Engineering
  • Chemistry
  • Engineering
  • Humidity
  • Intensity
  • Isotherms
  • Materials
  • Materials Laboratories
  • Materials Science
  • Mechanics
  • Military Research
  • New Jersey
  • Transition Temperature
  • Transitions
  • United States
  • Water Vapor

Readers

  • Combustion science or combustion engineering.
  • Mathematics or Statistics
  • Structural Dynamics.