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Low-field NMR studies of polymer crystallization kinetics: changes in the melt dynamics

C. Hertlein, K.Saalwächter, G. Strobl. Polymer 47, 7216 (2006)

Abstract

The free induction decay in 1H NMR experiments carried out for crystallizing polymers can be directly decomposed in contributions from crystals, melt-like regions and amorphous regions with a reduced mobility. Here the results of time-dependent experiments conducted with the aid of a cost-efficient low-field NMR instrument are presented, obtained for sPP, PεCL and P(EcO). Crystallization isotherms are compared with those obtained by X-ray scattering and dilatometry. There are some minor systematic deviations which can be explained and accounted for. For all systems a large fraction of amorphous chain parts in regions with a reduced mobility is found.

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