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Influence of diblock copolymer on the morphology and properties of polystyrene/poly(dimethylsiloxane) blends

Authors

  • Chengzhi Chuai,

    Corresponding author
    1. Department of Chemical Engineering, Tianjin University of Science and Technology, 1038 Dagunan Road, 300222 Tianjin, China
    2. The Danish Polymer Centre, Building 423, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
    Current affiliation:
    1. Department of Chemical Engineering, Tianjin University of Science and Technology, 1038 Dagunan Road, 300222 Tianjin, China
    • Department of Chemical Engineering, Tianjin University of Science and Technology, 1038 Dagunan Road, 300222 Tianjin, China
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  • Shu Li,

    1. Department of Chemical Engineering, Tianjin University of Science and Technology, 1038 Dagunan Road, 300222 Tianjin, China
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  • Kristoffer Almdal,

    1. The Danish Polymer Centre, Risø National Laboratory, P.O. Box 49, DK-4000, Roskilde, Denmark
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  • Jan Alstrup,

    1. The Danish Polymer Centre, Risø National Laboratory, P.O. Box 49, DK-4000, Roskilde, Denmark
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  • Jørgen Lyngaae-Jørgensen

    1. The Danish Polymer Centre, Building 423, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
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Abstract

Blends of polystyrene (PS) and poly(dimethylsiloxane) (PDMS), with and without diblock copolymers (PS-b-PDMS), were prepared by melt mixing. The melt rheology behavior of the blends was studied with a capillary rheometer. The morphology of the blends was examined with scanning electron microscopy. The miscibility of the blends was studied with differential scanning calorimetry. The morphology of PS/PDMS blends was modified by the addition of PS-b-PDMS copolymers and investigated as a function of the molar mass of the diblock copolymers, viscosity ratios and the processing conditions. As investigated, the observed morphology of the melt-blended PS/PDMS pair unambiguously supported the interfacial activity of the diblock copolymers. When a few percent of the diblock copolymers blended together with the PS and PDMS homopolymers, the phase size was reduced and the phase dispersion was firmly stabilized against coalescence. The compatibilizing efficiency of the copolymers was strongly dependent on its molar mass. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2747–2757, 2004

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