~(13)C NMR Study PP/ROSIN Blends

摘要

The solid state NMR technique was employed to investigated the homogeneity level of the melting mixtures of polypropylene (PP) and glycerol ester of hydrogenated rosin(ester gum)prepared at different proportions and under selected conditions.The results were sidcussed in terms of the blend domains with distinct mobilities at kilohertz range.Up to 30% of rosin the blends revealed a slight increase in the rpoton spin lattice relazation time in the rotating frame(T_1~Hp)values caused by increasing the mobility process of PP domains.The presence of one phase at the time scale of that relaxation parameter suggests sample homogeneity.The T_1~Hp value for blend with 50% of rosin indicated incompatibility.