Structure and morphology of a novel ethylene‐propylene copolymer and its blends with poly(propylene)

The structure and morphology of a commercial heterogeneous poly(ethylene-co-propylene) system (Adflex C202G) and its blends with poly(propylene) (PP) were investigated. Adflex is a complex mixture of copolymers with various C2/C3 ratio. Three components showing different solubility in xylene were separated by fractionation. Physical and chemical analyses of Adflex and of its various fractions suggest that Adflex consists of a semi-crystalline C3-rich phase and a less crystalline C2-rich phase containing spherical particles with an essentially amorphous interphase. In PP-Adflex blends, interactions between PP molecules and Adflex are evidenced by thermal analysis. Morphological studies of the blends show a spherulitic structure in the fractions containing at least 60% of PP.