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Quantitative analysis for reaction between epoxidized natural rubber and poly (L-lactide) through 1H-NMR spectroscopy

Authors

  • Takayuki Saito,

    1. Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
    2. Chemicals Evaluation and Research Institute, Japan, 1600, Shimo-Takano, Sugito-Machi, Kitakatusika-Gun, Saitama 345-0043, Japan
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  • Warunee Klinklai,

    1. Department of Materials and Metallurgical Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Thanyaburi, Pathumthani 12110, Thailand
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  • Yoshimasa Yamamoto,

    1. Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
    2. Center for Green-Tech Development in Asia, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
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  • Seiichi Kawahara,

    Corresponding author
    1. Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
    2. Center for Green-Tech Development in Asia, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
    • Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
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  • Yoshinobu Isono,

    1. Department of Materials Science and Technology, Faculty of Engineering, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
    2. Center for Green-Tech Development in Asia, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
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  • Yoshito Ohtake

    1. Chemicals Evaluation and Research Institute, Japan, 1600, Shimo-Takano, Sugito-Machi, Kitakatusika-Gun, Saitama 345-0043, Japan
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Abstract

Reaction between epoxidized natural rubber and poly(L-lactide) (PLLA) was investigated quantitatively in terms of conversion of the epoxidized natural rubber. The epoxidized natural rubber was prepared by epoxidation of high ammonia natural rubber (HA-NR) or deproteinized natural rubber (DPNR) with peracetic acid followed by depolymerization with ammonium persulfate. The resulting liquid HA-NR having epoxy group (LENR) or liquid DPNR having epoxy group (LEDPNR) were subjected to heating at 473 K for 20 min, after blending with PLLA. The products were characterized through morphology observation, DSC measurement, and 1H-NMR spectroscopy. The conversions of the rubbers were estimated from intensity ratio of signals in 1H-NMR spectrum for the products after removing unreacted rubber with toluene. Difference in the estimated conversion between the LENR/PLLA and LEDPNR/PLLA blends was interpreted in relation to proteins present in the rubber. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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