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Rheology/morphology/flow conditions relationships for polymethylmethacrylate/rubber blend

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Abstract

Viscoelastic behavior, phase morphology and flow conditions relationships in polymer/rubber blends have been investigated. The importance of such correlations is illustrated on polymethylmethacrylate (PMMA)/rubber blends subjected to different flow conditions both under small and large deformations. In small-amplitude oscillatory shear (the morphology does not change during the flow) the elastic modulus G′ of the concentrated blends shows a secondary plateau, G′ p , in the low frequency region. This solid-like behavior appears for rubber particle contents beyond the percolation threshold concentration (15%). Morphological observations revealed that for concentrations higher than 15%, the particles are dispersed in a three-dimensional network-type structure.

In capillary flow it was found that the network-type structure was destroyed and replaced by an alignment of particles in the flow direction. This morphological modification resulted in a decrease in both viscosity and post-extrusion swell of the blends. Morphological observations revealed that the ordered structure in the flow direction was concentrated only in the skin region of the extrudate, where the shear stress is higher than the secondary plateau, G′ p . A simple kinetic mechanism is proposed to explain the observed morphology.

Similarly, steady shear measurements performed in the cone-and-plate geometry revealed alignment of particles in the flow direction for shear stress values higher than G′p.

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Authors and Affiliations

  1. Chemical Engineering Department CERSIM, Laval University, st. Foy, GlK 7P4, Quebec, QC, Canada

    Mosto Bousmina

  2. Institut Charles Sadron (EAHP-CRM), 4, rue Boussingault, 67000, Strasbourg, France

    René Muller

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  1. Mosto Bousmina
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  2. René Muller
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Correspondence to Mosto Bousmina.

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Bousmina, M., Muller, R. Rheology/morphology/flow conditions relationships for polymethylmethacrylate/rubber blend. Rheola Acta 35, 369–381 (1996). https://doi.org/10.1007/BF00403538

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  • DOI: https://doi.org/10.1007/BF00403538

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