Ds. Idiyatullin et al., STUDIES OF DOMAIN MORPHOLOGY IN SEGMENTED POLYURETHANES BY PULSED NMR, Solid state nuclear magnetic resonance, 7(1), 1996, pp. 17-26
A new technique based on the Goldman-Shen pulse sequence with varying
preparation interval is proposed for the study of domain morphology of
segmented polyurethanes. The results of numerical calculations of the
magnetization recovery in different models of domain morphology show
that the method provides new information about the domain morphology w
hich is beyond the reach of the conventional Goldman-Shen experiment.
A close agreement of the theoretical predictions with the experimental
data on samples of segmented polyurethanes with a fixed molecular mas
s of the hard blocks and variable molecular mass of the soft blocks re
inforces the above statement. The resulting structural parameters obta
ined by this new NMR technique are compared with the data from the sma
ll-angle X-ray scattering (SAXS) method.