27) It is interesting to note that in phase II (a) of PVDF the closest H-F distances are not all to the fluorine atoms on adjacent carbon atoms. The shortest H-F distances of HI, for instance, are to F2 and F3, on adjacent different carbon atoms and to FI' and F2' on carbons three bonds removed from the carbon to which HI is connected (see ref 20).
expression of Torchia and Szabo.25 For a gauche-trans conformational transformation, we expect a Tl value of 5 ms at the minimum (rc ~2 ns). For a low-amplitude (±10°) libration, the predicted Tl at the minimum is 33 ms. Contributions to relaxation by other motions would decrease the observed T1 value. Since we observe a minimum 7\ of ~20 ms (42 °C), we conclude that fast librations are the dominant motional mode for relaxation at this temperature, with significant contribu-tions from fast (tc ~5 X ® s) gauche-trans conformational hops.
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