Poly dipolar rotational spin echo

Fig. 16. Dipolar rotational spin-echo C-NMR spectra of poly(styrene-co-sulfone) as a function of the number of evolution cycles used during dipolar evolution (left).

In the case of plasticized poly(butyral-co-vinyl alcohol) [73], use of dipolar rotational spin-echo CNMR in conjunction with C) determinations, has shown that the frequencies but not the amplitudes of cooperative main-chain motions of the polymer in the hard regions, corresponding to solid polymer associated with partially immobilized plasticizer, are influenced by interactions with the soft regions attributed to liquid plasticizer containing mobile polymer. From this result, a schematic representation of the partitioning of the polymer and plasticizer in terms of a two-phase domain model has been proposed. 

Figure 2. Dipolar rotational spin-echo 15.1-MHz nmr spectra of poly(p-chlorostyrene)...

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