C. Hertlein, K. Saalwächter, G. Strobl.
Low-field NMR studies of polymer crystallization
kinetics: changes in the melt dynamics.
Polymer. In press.
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