In this paper, investigations on the morphology development under uniaxial extensional flow are reported for an immiscible [poly(styrene-co-acrylonitrile)/polypropylene] and a partially miscible [poly(styrene-co-acrylonitrile)/polycarbonate] blend. Creep experiments were performed on samples with various initial droplet sizes under different constant stresses using an oilbath rheometer. At the end of each experiment, the samples were quickly removed from the rheometer and quenched in liquid nitrogen to freeze in the morphology. By means of scanning electron microscopy, their morphologies were visualized and the accordance with the critical capillary number was analyzed. A satisfactory agreement was found for the immiscible blend. In contrast, the partially miscible blends exhibited much smaller droplet deformation than expected and no fibril formation was found for any set of the parameters applied.
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May 2010
Research Article|
May 01 2010
Droplet deformation under extensional flow in immiscible and partially miscible polymer blends based on poly(styrene-co-acrylonitrile)
Andreas Kirchberger;
Andreas Kirchberger
Institute of Polymer Materials, Department of Materials Science,
Friedrich-Alexander-University Erlangen-Nürnberg
, Martensstraße 7, 91058 Erlangen, Germany
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Helmut Münstedt
Helmut Münstedt
a)
Institute of Polymer Materials, Department of Materials Science,
Friedrich-Alexander-University Erlangen-Nürnberg
, Martensstraße 7, 91058 Erlangen, Germany
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a)
Author to whom correspondence should be addressed: electronic mail: helmut.muenstedt@ww.uni-erlangen.de
J. Rheol. 54, 687–704 (2010)
Article history
Received:
July 07 2009
Citation
Andreas Kirchberger, Helmut Münstedt; Droplet deformation under extensional flow in immiscible and partially miscible polymer blends based on poly(styrene-co-acrylonitrile). J. Rheol. 1 May 2010; 54 (3): 687–704. https://doi.org/10.1122/1.3380856
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