Effect of intramolecular interactions on the miscibility windows of PVC blends with modified SAN copolymers

Authors

  • Chul-Hwan Kim,

    1. Department of Chemical Engineering Korea Advanced Institute of Science and Technology Daejon, 305-701, Korea
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  • Jung-Ki Park,

    Corresponding author
    1. Department of Chemical Engineering Korea Advanced Institute of Science and Technology Daejon, 305-701, Korea
    • Department of Chemical Engineering Korea Advanced Institute of Science and Technology Daejon, 305-701, Korea
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  • Taek-Sung Hwang

    1. Department of Industrial Chemistry Chunan National Junior Technical College Chunan, Korea 330-240
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Abstract

We investigated the miscibility windows in the blends of poly(vinyl chloride) (PVC) with chemically modified styrene/acrylonitrile (SAN) copolymers such as α-methyl styrene/acrylonitrile (α SAN), α-methyl styrene/methacrylonitrile (MSMAN). The blends of PVC with α SAN were found to have the broader miscibility window. This enhanced miscibility was interpreted in terms of intramolecular repulsion that originates from unfavorable interaction between counits of the copolymers and also intramolecular association of AN units. The intramolecular interactions were studied by using Fourier transform infrared (FT-IR) spectroscopy. These interactions were reflected by a peak broadening in the nitrile stretching band in the acrylonitrile segments. The intermolecular interactions governing the miscibility in the blends of PVC with the series of copolymers were also discussed.

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