CONFIGURATIONAL-CONFORMATIONAL STATISTICS OF STEREOIRREGULAR POLYSTYRENE

The dependence of the configurational-conformational characteristics, such as the mean-square end-to-end distance, the mean-square radius of gyration, and the temperature coefficient of the stereoirregular poly styrene chains on the fraction of meso dyads, P-m, was investigated, u sing the periodic condition method. The calculation shows that polysty rene has the most compact chain when P-m = 0.7, and the temperature co efficient of the characteristic ratio of the mean-square end-to-end di stance reaches the minimum, -0.89 x 10(-3) K-1, at P-m = 0.5. The theo retical result of the mean-square radius of gyration for atactic polys tyrene, [S2](1/2) = 0.2245 M(0.5106), shows good agreement with the ex perimental measurement in both bulk amorphous state and theta-solvent.