Abstract: The crystal structure and miscibility of PP/EPO biends have been investigated byWAXD, TBA and DSC. The degree of crystallinity of PP/EPO blends decreases with increa-sing content of EPO,and the unit cell parameters are independent of the blend composition.Hosemann's treatment was used to separate crystallite size and distortion broadening. TheX-ray diffraction profile was corrected by Cauchy and Gaussian functions. Observationsmade with TBA and DSC indicated that, though immiscibility of PP/EPO blends, thereis a partial interfacial miscibility between the two amorphous phases.

Key words: polypropylene, ethylene-propylene-octene copolymer, miscibility, WAXD, DSC