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Annealing of polypropylene–poly(ethylene‐co‐propylene) blends. I. Thermal and physical properties of blends
Author(s) -
Ito Junichi,
Mitani Katsuo,
Mizutani Yukio
Publication year - 1984
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1984.070290108
Subject(s) - polypropylene , materials science , crystallinity , annealing (glass) , crazing , composite material , polymer , amorphous solid , ultimate tensile strength , izod impact strength test , polymer blend , brittleness , polymer chemistry , copolymer , chemistry , organic chemistry
Annealing of polypropylene and blends of polypropylene and poly(ethylene‐co‐propylene) was studied. The structural and physical properties were determined from thermal, mechanical, physicochemical, and spectral investigations. The particular emphasis was on the characteristics of structure and thermal properties of relatively amorphous components segregated from the crystalline region by annealing. Annealing of polypropylene induced an increase in crystallinity resulting in a decrease in impact strength. In contrast, by annealing a blend of polypropylene and poly(ethylene‐co‐propylene), the impact strength and rigidity were significantly improved with an increase in annealing temperature. The effect of annealing in a binary system was ascribed to the formation of a thicker transitional layer at the interface of the two polymers owing to the increased mobility of amorphous polymer segments. The results of tensile impact strength and brittle temperature were correlated with a deformational mechanism involving the crazing of the matrix.