Crystal morphology

internal structure of dispersed phase and phase morphology for two impact polypropylene copolymers with the same ethylene content

rubber content

relative molecular weight and relative molecular weight distribution

but obviously different toughness were investigated by polarized optical microscope

differential scanning calorimetry

wide angle X—ray diffraction

dynamic mechanical analysis and atomic force microscope．It was found that the crystallization morphology and behavior of both samples were simile

but the compatibility between the dispersed phase and the matrix in IPC-A was better than that in IPC-B．Moreover

phase composition of the matrix and the dispersed phase of the different IPC were analyzed．It was found that the dispese phase displayed a complex concealment structure．Models of phase structure were proposed to describe the phase structure of both IPC heterophase systems and the action of E-b-P in the IPC．It is suggested that phase morphology phys a more important role as a compatibilizer in enhancing impact strength of IPC．