Abstract
T 1, T 2 and NOE were measured in 13C n.m.r. spectra of two fractions of poly [(S)-4-methyl-1-hexene] obtained by selective solvent extraction (diethyl ether and cyclohexane) of the polymers prepared in the presence of isospecific catalysts. T 1 measurements provide evidence in the two fractions for the existence of different conformational weightings about side chain bonds according to conclusions from vibrational spectroscopy studies. Subtle configurational differences of the two substantially isotactic samples are suggested to explain this result. A discussion of the dynamic parameters related to the correlation time is also presented which supports the above explanation.
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