THE PROPERTIES OF POLYPROPYLENE AS CONTRO LLED BY PRECIPITATION CONDITIONS

Samples of polypropylene were examined, which were prepared by repreci pitation of the polymer from good (heptadecane) and poor (chlorobenzen e) solvents, subsequent evaporation of the traces of solvent, and reme lting in inert atmosphere. It was found that for the samples compared, the density of polymer, its crystallinity, and solubility parameters for low-molecular-mass compounds differed markedly. The critical conce ntrations of the antioxidating agent phenyl-beta-naphthylamine during the oxidation of these samples in melt differed by 1.9 times. The theo ry that explains the reported phenomena is suggested.