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Bärwinkel S, Seidel A, Hobeika S, et al. Morphology Formation in PC/ABS Blends during Thermal Processing and the Effect of the Viscosity Ratio of Blend Partners. Materials (Basel). 2016;9(8)doi: 10.3390/ma9080659.
Bärwinkel, S., Seidel, A., Hobeika, S., Hufen, R., Mörl, M., & Altstädt, V. (2016). Morphology Formation in PC/ABS Blends during Thermal Processing and the Effect of the Viscosity Ratio of Blend Partners. Materials (Basel, Switzerland), 9(8), . https://doi.org/10.3390/ma9080659
Bärwinkel, Stefanie, et al. "Morphology Formation in PC/ABS Blends during Thermal Processing and the Effect of the Viscosity Ratio of Blend Partners." Materials (Basel, Switzerland) vol. 9,8 (2016). doi: https://doi.org/10.3390/ma9080659
Bärwinkel S, Seidel A, Hobeika S, Hufen R, Mörl M, Altstädt V. Morphology Formation in PC/ABS Blends during Thermal Processing and the Effect of the Viscosity Ratio of Blend Partners. Materials (Basel). 2016 Aug 05;9(8). doi: 10.3390/ma9080659. PMID: 28773780; PMCID: PMC5509270.
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Materials (Basel). 2016 Aug 05;9(8). doi: 10.3390/ma9080659.

Morphology Formation in PC/ABS Blends during Thermal Processing and the Effect of the Viscosity Ratio of Blend Partners.

Materials (Basel, Switzerland)

Stefanie Bärwinkel, Andreas Seidel, Sven Hobeika, Ralf Hufen, Michaela Mörl, Volker Altstädt

Affiliations

  1. Graduate School, University of Bayreuth, Universitätstraße 30, Bayreuth 95447, Germany. [email protected].
  2. Covestro Deutschland AG, Business Unit Polycarbonates, Research & Development, Development Blends, Leverkusen 51365, Germany. [email protected].
  3. Covestro Deutschland AG, Business Unit Polycarbonates, Research & Development, Development Blends, Leverkusen 51365, Germany. [email protected].
  4. Covestro Deutschland AG, Business Unit Polycarbonates, Research & Development, Development Blends, Leverkusen 51365, Germany. [email protected].
  5. Department of Polymer Engineering, University of Bayreuth, Universitätsstraße 30, Bayreuth 95447, Germany. [email protected].
  6. Department of Polymer Engineering, University of Bayreuth, Universitätsstraße 30, Bayreuth 95447, Germany. [email protected].

PMID: 28773780 PMCID: PMC5509270 DOI: 10.3390/ma9080659

Abstract

Morphology formation during compounding, as well as injection molding of blends containing 60 wt % polycarbonate (PC) and 40 wt % polybutadiene rubber-modified styrene-acrylonitrile copolymers (ABS), has been investigated by transmission electron microscopy (TEM). Profiles of the blend morphology have been recorded in injection-molded specimens and significant morphology gradients observed between their skin and core. A <10 µm thick surface layer with strongly dispersed and elongated nano-scale (streak-like) styrene acrylonitrile (SAN) phases and well-dispersed, isolated SAN-grafted polybutadiene rubber particles is followed by a 50-150 µm thick skin layer in which polymer morphology is characterized by lamellar SAN/ABS phases. Thickness of these lamellae increases with the distance from the specimen's surface. In the core of the specimens the SAN-grafted polybutadiene rubber particles are exclusively present within the SAN phases, which exhibit a much coarser and less oriented, dispersed morphology compared to the skin. The effects of the viscosity of the SAN in the PC/ABS blends on phase morphologies and correlations with fracture mechanics in tensile and impact tests were investigated, including scanning electron microscopy (SEM) assessment of the fracture surfaces. A model explaining the mechanisms of morphology formation during injection molding of PC/ABS blends is discussed.

Keywords: PC/ABS; blend morphology; fracture surface; polymer blend; skin-core morphology; viscosity ratio

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