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Melt rheological properties of PBT/SEBS and reactively compatibilized PBT/SEBS/SEBS‐ g ‐MA polymer blends
Author(s) -
Sharma Rajul,
Maiti Saurindra Nath
Publication year - 2015
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.41402
Subject(s) - materials science , composite material , rheology , rheometer , shear rate , polymer blend , shear stress , volume fraction , shear (geology) , polymer , copolymer
Melt rheological properties of PBT/SEBS and PBT/SEBS/SEBS‐ g ‐MA blends at SEBS volume fraction (Φ d ) = 0.00–0.38 were studied at 240°C, 250°C and 260°C using a capillary rheometer. The compatibilizer SEBS‐ g ‐MA addition resulted in significant reduction in the dynamic interfacial tension which in turn led to increased phase adhesion. The power law exponent n decreased with increasing Φ d and increasing temperature for both the compatiblized and uncompatiblized blends. The consistency index of PBT/SEBS increased with increasing Φ d but were smaller than those of PBT/SEBS/SEBS‐ g ‐MA blends. Melt elasticity such as die swell and first normal stress difference increased with Φ d . Variations of first normal stress coefficient function (ψ 1 ), recoverable shear strain (γ R ), relaxation time (λ), and shear compliance (J c ) values versus shear rate were analyzed. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41402.