CRYSTALLIZATION,MECHANICAL AND THERMAL PROPERTIES OF SORBITOL DERIVATIVES NUCLEATED POLYPROPYLENE/CALCIUM CARBONATE COMPOSITES

The effect ofαphase nucleating agent（NA） 1,3:2,4-bis（3,4-dimethylbenzylidene） sorbitol（DMDBS） on crystallization and physical properties of polypropylene/calcium carbonate（PP/CaCO;） composites has been comparatively investigated.Compared with binary PP/CaCO;composites,in which CaCO;exhibits weak heterogeneous nucleation, inconspicuous reinforcement and toughening effects for PP,the introduction of a few amounts of DMDBS induces a great increase of the degree of crystallinity.Largely improved tensile properties,fracture toughness at relatively higher temperature and heat deformation temperature（HDT） are observed for DMDBS nucleated PP/CaCO;composites.