Abstract
SOME of the earliest applications of nuclear magnetic resonance (NMR) concerned molecular structural determinations in the solid state via proton NMR second moments, a sensitive function of the number, types and relative positions of the constituent nuclei. This classical technique has been extended to polymeric solids, but it has not previously been exploited to address the problem of molecular morphology in polymer crystals. We describe here a framework for the interpretation of such measurements in cocrystals of polyethylene (PEH) and perdeuteropolyethylene (PED) and present preliminary experimental data. The potential of this technique for distinguishing between adjacent re-entry and random re-entry molecular morphologies on a very local scale complements the ability of small angle neutron scattering (SANS) to ascertain the larger scale configuration of the polymer chain.
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NATARAJAN, K., SAMULSKI, E. & CUKIER, R. Molecular morphology of polyethylene determined by NMR. Nature 275, 527–530 (1978). https://doi.org/10.1038/275527a0
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DOI: https://doi.org/10.1038/275527a0
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