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A comparison between apparent viscosity and dynamic complex viscosity for polypropylene/maleated polypropylene blends
Author(s) -
Li Shucai,
Järvelä Pentti K.,
Järvelä Pirkko A.
Publication year - 1997
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.11641
Subject(s) - polypropylene , materials science , maleic anhydride , viscosity , copolymer , rheology , composite material , phase (matter) , rheometry , polymer , organic chemistry , chemistry
Apparent shear and dynamic complex viscosity measurements at 200°C and 230°C, for a series of blends of a homopolypropylene (PPVC) with maleic anhydride polypropylene (PP‐g‐MA) and blends of an ethylene‐propylene copolymer (PPSC) with PP‐g‐MA, are reported. The data were taken using a capillary rheometer and a dynamic mechanical thermal analyzer. The results are analyzed in terms of the Cox‐Merz rule. Data taken at 230°C for both matrices (viz. PPVC and PPSC) follow the Cox‐Merz rule. However, deviations are noted in the blends, especially in compositions wherein PP‐g‐MA content is above 10 wt%. Cross phase separation and charges in the dispersed phase size (of PP‐g‐MA) in the two types of measurement appear to be the cause of the failure of the Cox‐Merz rule.