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- W2023005672 abstract "Crosslinks are introduced into polymers either deliberately so as to enhance material properties such as stiffness, stability and solvent resistance, or are formed as a result of degradation processes. In either case, the inherent insolubility of the materials limits the number of techniques available for characterization of the details of crosslinking. NMR spectroscopy has been applied to this problem for over 40 years. Chemical structure can be characterized using high-resolution solution NMR prior to gelation, or high-resolution MAS NMR after the material has gelled. A range of different experimental approaches are discussed in this review. Crosslink density can be determined using measurements of 1HT2 relaxation times, which are sensitive to changes in the motional state of the polymer chains after crosslinking. The relationship between NMR relaxation parameters and macroscopic properties such as crosslink density and the glass transition is of much interest. Changes in the relaxation parameters are used to provide contrast in recent NMR imaging experiments, which can provide maps not only of the crosslink density, but also of material properties." @default.
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- W2023005672 date "1986-10-01" @default.
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- W2023005672 title "NMR imaging of a solid by the magic-angle rotating-frame method" @default.
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- W2023005672 doi "https://doi.org/10.1016/0022-2364(86)90162-9" @default.
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