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Rheological properties of polypropylene/high‐density polyethylene blend melts. II. Dynamic viscoelastic properties
Author(s) -
Fujiyama Mitsuyoshi,
Kawasaki Youtoku
Publication year - 1991
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.1991.070420220
Subject(s) - materials science , viscoelasticity , polypropylene , rheology , composite material , tacticity , dynamic modulus , viscosity , polyethylene , dynamic mechanical analysis , polymer blend , plastics extrusion , rheometry , high density polyethylene , polymer , copolymer , polymerization
Three kinds of isotactic polypropylenes with different MFI were melt‐blended with three kinds of high‐density polyethylenes with different MFI using a screw extruder and the dynamic viscoelastic properties were studied. The storage moduli G ′(ω) of the blends showed second plateaus and the dynamic viscosities η′(ω) of the blends showed two‐step drops with increasing angular frequency ω. Such phenomenon was particularly notable for blend systems in which particles of lower viscosity were suspended in the disperse medium of higher viscosity and is considered to be the cause of abnormally large die swell.