Friction Transition In Polyimide Films as Related to Molecular Relaxations and Structure.

Abstract

The friction characteristics of polyimide films bonded to metallic substrates were studied from 25 C to 500 C. These results were correlated to molecular structure and the results of torsional braid analysis (TBA). A large friction transition (0. 23 to 0.03) was found to occur at 45 C + OR - 5 C. It was postulated that this transition was initiated by some molecular relaxation, which gave the molecules a degree of freedom by which an external mechanical stress could rearrange the molecules into a structure, such as an extended chain, which is conducive to easy shear. Above 300 C the friction characteristics were found to be dependent on the thermal prehistory of the film. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1975
Accession Number
ADA303579

Entities

People

  • Robert L. Fusaro

Organizations

  • Glenn Research Center

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Absorption
  • Crystallization
  • Crystals
  • Energy
  • Films
  • Frequency
  • Friction
  • Glass Transition Temperature
  • Liquid Crystals
  • Lubricants
  • Measurement
  • Mechanical Properties
  • Physical Properties
  • Solid Lubricants
  • Stainless Steel
  • Stresses
  • Transition Temperature

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Polymer Science and Technology
  • Theoretical Analysis.