抄録
The intramolecular NMR second moments of various amorphous vinyl-type polymers have been calculated in terms of the local regularity parameter z, the fraction of gauche-configuration bonds. These values of second moments at z=0 are to be compared with those calculated for crystalline polymers. The influence of foreign magnetic nuclei is negligibly small except for that of F nuclei to H-resonance and vice versa. The difference between isotactic and syndiotactic vinyl polymers has been shown. The error caused by omitting the contributions of farther distant nuclei than those where two C-C bonds and two C-H bonds intervene is estimated as less than a few percent of the total second moment for the amorphous polyethylene.
