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- W1528199530 abstract "This chapter describes new magic-angle-spinning NMR techniques for quantifying dynamics in complex polymeric materials. The new techniques make it possible to characterize segmental motions, with correlation times ranging from < 10–6 s to 10 s, quantitatively in terms of the motional amplitude and geometry, the number of orientational sites accessible to the moving segments, and the fraction of mobile segments. This progress has been achieved by combining evolution under recoupled anisotropic interactions that probe segmental reorientations, with highsensitivity MAS detection. Not only does MAS enhance the sensitivity, but it also greatly increases the site resolution, making assignments of motional effects to specific groups unambiguous. Owing to the use of recoupling rather than standard spinning sidebands, the methods discussed have no upper limit in terms of the spinning speed; in fact, elimination of multispin dipolar couplings at high spinning speeds simplifies the spin systems greatly. For slow motions, exchange NMR methods such as CODEX and the closely related time-reversed ODESSA method, as well as DQ exchange NMR, provide surprisingly high sensitivity to small-amplitude motions. This is explained in terms of the chemical-shift difference tensor; such an analysis can also be applied to other stimulated-echo methods. Jumps and diffusive motions are directly distinguishable from the effect of mixing time on the recoupling-time dependence of their exchange intensity, which reflects the characteristic changes of the reorientation-angle distributions." @default.
- W1528199530 created "2016-06-24" @default.
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- W1528199530 date "2002-01-01" @default.
- W1528199530 modified "2023-09-24" @default.
- W1528199530 title "Dynamics of polymers from one- and two-dimensional solid-state NMR spectroscopy" @default.
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- W1528199530 doi "https://doi.org/10.1016/s0066-4103(02)48002-7" @default.
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