WAXD patters of suggested block copolymers of polypropylene and ethylene-propylene copolymer

PP-EPR and PP-EPR-PP

synthesized by sequential polymerization with δ-TiCl3-Et2AlCl were examined and compared with WAXD of mechanical blends and chain-transfer mixtures of PP and EPR of comparable compositions. The peak at 2θ= 20° for both the copolymers and the mixtures was attributed to γ-modification of PP in EPR. Strong variation in the ratio of diffraction intensities I040/I110 of PP in block copolymers and mixtures was explained in terms of crystallite growth in different directions. Analysis of the spectra and calculation of crystallinity

crystallites size and alttice parameters led to the conclusion that block structure existed in the prepared copolymers.