Accession Number:

ADA073590

Title:

Magnetic Resonance Studies of Epoxy Resins and Polyurethanes.

Descriptive Note:

Final rept. 3 Feb 78-3 May 79,

Corporate Author:

MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO

Report Date:

1979-05-03

Pagination or Media Count:

110.0

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.

Subject Categories:

  • Plastics
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE