Magnetic Resonance Studies of Epoxy Resins and Polyurethanes.
Final rept. 3 Feb 78-3 May 79,
MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO
Pagination or Media Count:
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.
- Atomic and Molecular Physics and Spectroscopy