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The melt compatibility of blends of polypropylene and ethylene‐propylene copolymers
Author(s) -
Lohse David J.
Publication year - 1986
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760262106
Subject(s) - polypropylene , materials science , tacticity , copolymer , crystallinity , ethylene , ethylene propylene rubber , composite material , compatibility (geochemistry) , melting temperature , polymer blend , polymer chemistry , polymer , polymerization , organic chemistry , catalysis , chemistry
Blends of polypropylene with ethylene‐propylene copolymers of various compositions have been studied by small angle neutron scattering with regard to their compatibility at room temperature and in the melt. It has long been known that such blends separate into distinct phases at lower temperatures due to the crystallinity of the isotactic polypropylene, The work described herein has shown that these blends are also immiscible in the melt, even where the ethylene content of the copolymer is as low as 8 percent. Moreover, the separated phase domains grew rapidly at melt temperatures. Blends of atactic polypropylene with isotactic polypropylene did become miscible upon melting.