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Viscoelastic features of molten blends of poly(vinyl chloride)/poly(ethylene‐vinyl acetate)
Author(s) -
Hernández R.,
Del Agua J. A.,
Peña J. J.,
Santamaría A.
Publication year - 1996
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.10657
Subject(s) - materials science , rheometry , vinyl chloride , viscoelasticity , dynamic modulus , composite material , extrusion , dynamic mechanical analysis , vinyl acetate , polymer , volume (thermodynamics) , modulus , viscosity , shear modulus , polymer blend , polymer chemistry , thermodynamics , copolymer , physics
Abstract Dynamic viscoelastic measurements and extrusion rheometry results of immiscible and partially miscible PVC/EVA blends from 50 to 90 wt% in PVC are presented and compared with those of plasticized PVCs. From loss modulus data the plateau modulus, G N o , associated with entanglements, is calculated. The variation of G N o with composition is analyzed using the theory of Tsenoglou. A simple model, which accounts for the effect of a structural parameter and the effect of free volume, is used to adjust viscosity data, taken at several frequencies and shear rates. For both types of blends, best fits are obtained using a model that establishes that the free volume of each polymer is not measurably altered by the other.