| Abstract
| - Carbon-13 rotational-echo double-resonance (REDOR) NMR with15N or 2H dephasing,combined with 15N REDOR NMR with 13C dephasing,has been obtained for a fully cross-linked epoxyresin prepared from a nominally uniform mixture of two parts ofdiglycidyl ether of Bisphenol A, onepart of hexamethylenediamine, and 19% (by weight) antiplasticizer madefrom a carbonyl-13C-labeledaromatic acetamide. The antiplasiticizer contains thehydroxypropyl ether moiety of the epoxy repeatunit. A partially cross-linked resin was formed from five parts ofepoxide, one part of hexamethylenediamine, three parts of hexylamine, and 19% (by weight)antiplasticizer. Labels were introduced intothe resin by replacing both methyl groups of the isopropylidene moietyof Bisphenol A with CD3 groupsand by using [15N2]hexamethylenediamineand [15N]hexylamine (and their unlabeledcounterparts) invarious combinations. The antiplasticizer 13C-carbonylcarbon is 4.9 ± 0.5 Å from an amine 15N (withnopreference for free or cross-linked sites) and 6.7 ± 1 Å from aquaternary carbon of the isopropylidenemoiety.
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