Interpretation of broad line nuclear magnetic resonance in oriented poly(ethylene terephthalate)

Broad line nuclear magnetic resonance measurements on oriented poly(ethylene terephthalate) sheets have been reconsidered, in the light of recent infra-red data on similar materials. It is shown that the n.m.r. anisotropy is consistent with a model for the molecular orientation, in which the fraction of the polymer in the trans conformation is highly oriented, whereas the gauche fraction is sensibly isotropic.