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Blends of low density polyethylene/plasticized poly(vinyl chloride): The rheological, morphological, and mechanical characterization

1990; Wiley; Volume: 39; Issue: 8 Linguagem: Inglês

10.1002/app.1990.070390809

1097-4628

Raija Mikkonen, Antti Savolainen,

Polymer crystallization and properties

Abstract An experimental study was conducted to investigate the rheological, morphological, and mechanical properties of a heterogeneous polymer blend system consisting of low density polyethylene (LDPE) and plasticized poly(vinyl chloride) (PVC). The components were mixed using a single‐screw extruder, which was equipped with a special measuring head for the determination of rheological quantities. The morphology of blends was examined by scanning electron microscopy. Die swell was determined by photography. The velocity of ultrasound through the polymer melt was also measured. The dependencies of viscosity, die swell, and ultrasonic velocity on blend composition were qualitatively similar, exhibiting a minimum at about 70 wt % PVC. The morphology of the blend system at this blending ratio was different from morphologies of the other blends. Tensile properties of blends, except elongation at break, were not significantly inferior to those of the LDPE component.