Magnetic Resonance Studies of Epoxy Resins and Polyurethanes.

Abstract

Electron paramagnetic resonance (EPR) and proton nuclear magnetic resonance (NMR) have been used to investigate the changes in molecular motions that result in samples of the epoxy resin bisphenol-A diglycidyl ether (DGEBA) cured with diethylene triamine (DETA) and in samples of several polyester polyurethanes subjected to humid environments. The cured epoxy resin is known to show a lowering of the glass transition temperature following water sorption, whereas the polyester polyurethanes undergo hydrolysis and catastrophically depolymerize from rubbery solids to viscous liquids.

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Document Details

Document Type
Technical Report
Publication Date
May 03, 1979
Accession Number
ADA073590

Entities

People

  • A. C. Lind
  • I. M. Brown
  • T. C. Sandreczki

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Body Weight
  • Chemistry
  • Epoxy Resins
  • Equations
  • Free Radicals
  • Frequency
  • Glass Transition Temperature
  • Heat Of Activation
  • Magnetic Resonance
  • Materials
  • Materials Science
  • Mechanical Properties
  • Military Research
  • Resins
  • Spectra
  • Transition Temperature
  • Transitions

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Polymer Science and Engineering.

Technology Areas

  • Microelectronics