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Studies on the dynamically vulcanized polypropylene (PP)/butadiene styrene block copolymer (SBS) blends: Melt rheological properties
Author(s) -
Saroop Madhumita,
Mathur G. N.
Publication year - 1997
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/(sici)1097-4628(19970926)65:13<2703::aid-app11>3.0.co;2-y
Subject(s) - materials science , vulcanization , copolymer , rheology , polypropylene , composite material , die swell , viscosity , polymer blend , tacticity , natural rubber , polymer chemistry , extrusion , polymer , polymerization
Unvulcanized and dynamically vulcanized blends of isotactic polypropylene (PP) and butadiene‐styrene block copolymer (SBS), in the composition range of 10–40 wt % SBS content are prepared in an internal mixer and the vulcanization process is investigated through time‐torque curves. Study of melt rheological properties of these blends are reported, and results show the effects of blend composition and shear rate on melt viscosity and melt elasticity. Blending of PP with SBS increases melt viscosity and decreases extrudate distortion. Dynamically vulcanized blends show higher melt viscosity and lower melt elasticity than corresponding unvulcanized blends with no melt fracture in the studied range. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 2703–2713, 1997