HIGH-TEMPERATURE NMR TECHNIQUES FOR STUDYING CROSS-LINKED EPOXY SYSTEMS

The network structures formed when the diglycidyl ether of bisphenol A is cured with two stoichiometries of diaminodiphenyl sulfone have bee n studied by solid-state C-13 n.m.r. at temperatures well above the gl ass transition temperature. High-resolution spectra have been obtained giving detailed information on the chemistry of these structures. Spe ctral editing and two-dimensional techniques more usually associated w ith solution-state n.m.r. have been used to confirm structural element s previously postulated. The value of high-temperature n.m.r. for amor phous and rigid systems such as epoxies is discussed.