C. Hertlein, K. Saalwächter, G. Strobl.
Low-field NMR studies of polymer crystallization kinetics: changes in the melt dynamics.
Polymer 47, 7216-7221 (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 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 poly(ε-caprolactone), s-polypropylene and polyethylene. Crystallization isotherms are compared with those obtained by X-ray scattering and dilatometry. Some minor systematic deviations can be explained and accounted for. One finds for all systems a large fraction of units in amorphous regions with reduced mobility.