Isotactic poly(allyl vinyl ether), 2. An NMR-study of stereoregularity and relaxation times

The stereoregularity of poly(allyl vinyl ether), (poly[1‐(allyloxy)ethylene], 1) was studied by both 1H‐ and 13C NMR‐spectroscopy at 6,34 tesla. Even at this field the 1H NMR‐resonances severely overlap, thus hampering a reliable analysis. The situation is far better for the 13C NMR‐resonances; here even hexad splittings could be observed. Relaxation time ratios of the backbone carbon atoms are consistent with a dipolar relaxation mechanism. The relaxation time for the racemic peak is longer than that for the meso peaks, which is in contrast with literature data for other polymers7,8. This deviating behaviour could be accounted for by the higher magnetic field used in our measurements.