THE CONFORMATIONAL BEHAVIOR OF RODLIKE PO LYNAPHTHOYLENIMIDES

The effect of such chain ''defects'' as incomplete cycle formation or nonplanar character of the naphthoylenimide cycle on the conformationa l rigidity of the polynaphthoylenimide chains was studied using polyna phthoylenimidoquinazoline as an example. It was shown by quantum-chemi cal and conformational analyses that incomplete cycle formation in pol ynaphthoylenimides exerts almost no effect on the rigidity of the poly mer chain. At the same time, the experimental values of the conformati onal rigidity can be explained assuming that the chain consists of 10- 15% units containing the naphthoylenimide cycle in the boat conformati on.