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Rheological properties of polystyrene blends with rigid ladderlike polyphenylsilsesquioxane

Authors

  • Gui Zhi Li,

    Corresponding author
    1. Venture Business Laboratory, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Japan
    2. Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762
    • Venture Business Laboratory, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Japan
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  • T. Matsuda,

    1. Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Japan
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  • A. Nishioka,

    1. Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Japan
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  • K. Miyata,

    1. Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Japan
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  • Y. Masubuchi,

    1. Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Japan
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  • K. Koyama,

    Corresponding author
    1. Venture Business Laboratory, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Japan
    2. Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Japan
    • Venture Business Laboratory, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Japan
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  • C. U. Pittman Jr.

    1. Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762
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Abstract

Polystyrene (PS) blends with rigid ladderlike polyphenylsilsesquioxane (PPSQ) were prepared by solution casting followed by hot pressing. The rheological properties of these blends were studied under dynamic shear and uniaxial elongation conditions. The loss modulus (G″) and dynamic shear viscosity (η*) of the 95/5 PP/PPSQ blend were slightly lower than those of pure PS at low frequencies (≤10−2 rad/s). However, the storage modulus (G′), G″, and η* of the other blends (90/10, 85/15, and 80/20) were higher than those of pure PS and increased with PPSQ content. The ηE data demonstrated that PS/PPSQ blends exhibited slightly weaker (5% PPSQ) or much weaker (10% PPSQ) strain hardening than PS. In contrast, the 85/15 and 80/20 PP/PPSQ blends showed strain softening, and the extent of strain softening increased with PPSQ content. PS entanglements might have been reduced by the specific interactions between PS and PPSQ, which locally ordered some PS molecules in the 95/5 blend sample, because most of the PPSQ might have been well dispersed in the PS continuous phase, and only a few small PPSQ particles (∼1.3 μm) were formed because of good miscibility. However, at high PPSQ contents (≥10%), many larger hard PPSQ particles were formed, which acted as fillers during the rheological measurements. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 706–713, 2005

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