Abstract
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 similar,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 Eb-P in the IPC.It is suggested that phase morphology plays a more important role as a compatibilizer in enhancing impact strength of IPC.
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