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<p>This study comprehensively investigates the rheological behavior of acrylonitrile butadiene styrene (ABS) and polystyrene (PS) blends using capillary viscometry with Bagley and Rabinowitsch corrections at temperatures between 200 and 230&#xa0;°C. The blends exhibited pronounced pseudoplastic (shear-thinning) behavior, with the flow index decreasing as PS content increased. A key finding was that extensional viscosity consistently exceeded shear viscosity, leading to a dramatic rise in the Trouton ratio (from ~4 for pure ABS to ~185 for pure PS), indicating significantly greater resistance to stretching flows than to shearing flows. The activation energy for viscous flow decreased with increasing shear stress, providing molecular-level insight into the shear-thinning mechanism. The successful application of the time-temperature superposition (TTS) principle allowed the construction of master curves, confirming thermorheological simplicity within the studied range. Crucially, morphological analysis via Scanning Electron Microscopy (SEM) revealed a clear evolution from dispersed droplets to co-continuous structures with changing composition, directly linking the observed rheological transitions—such as viscosity reduction and enhanced extensional resistance—to phase separation and the dominant continuity of the PS phase. These integrated rheological-morphological findings provide a robust foundation for optimizing ABS/PS blend formulations and processing parameters, especially for applications in automotive and electrical sectors requiring a balance of toughness, processability, and predictable melt behavior.</p>

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“Investigation of the rheological properties of polystyrene (PS) and acrylonitrile butadiene styrene (ABS) blends utilizing capillary Viscometry”

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Rama Al-Joubrani,
  • Hassan Alkurdi,
  • Fawaz Deri

摘要

This study comprehensively investigates the rheological behavior of acrylonitrile butadiene styrene (ABS) and polystyrene (PS) blends using capillary viscometry with Bagley and Rabinowitsch corrections at temperatures between 200 and 230 °C. The blends exhibited pronounced pseudoplastic (shear-thinning) behavior, with the flow index decreasing as PS content increased. A key finding was that extensional viscosity consistently exceeded shear viscosity, leading to a dramatic rise in the Trouton ratio (from ~4 for pure ABS to ~185 for pure PS), indicating significantly greater resistance to stretching flows than to shearing flows. The activation energy for viscous flow decreased with increasing shear stress, providing molecular-level insight into the shear-thinning mechanism. The successful application of the time-temperature superposition (TTS) principle allowed the construction of master curves, confirming thermorheological simplicity within the studied range. Crucially, morphological analysis via Scanning Electron Microscopy (SEM) revealed a clear evolution from dispersed droplets to co-continuous structures with changing composition, directly linking the observed rheological transitions—such as viscosity reduction and enhanced extensional resistance—to phase separation and the dominant continuity of the PS phase. These integrated rheological-morphological findings provide a robust foundation for optimizing ABS/PS blend formulations and processing parameters, especially for applications in automotive and electrical sectors requiring a balance of toughness, processability, and predictable melt behavior.