Abstract

Following an earlier study of the 1H relaxation and NMR line shapes, we have carried out selective one-dimensional and two-dimensional 13C solid-state NMR studies that yield to detailed interpretation of the dynamics in form I, II, and III polymorphs of isotactic poly-1-butene. A specific defect diffusion along the side group is proposed to account for the temperature dependence of the 13C spectra in form I. The backbone of the helix in forms II and III is shown to undergo large angle motions above the glass-transition temperature. High-resolution solid-state 13C two-dimensional exchange NMR under magic-angle spinning with cross-polarization techniques demonstrates the existence of slow rotational jumps of the helices in form III with typical jump rates of about 10 s−1. © 2000 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 38: 2611–2624, 2000

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