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Ionic-Liquid-Derived, Water-Soluble Ionic Cellulose

Authors

  • Huyen Thanh Vo,

    1. Clean Energy Center, Korean Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-gu, Seoul, 305-355 (South Korea), Fax: (+82) 2958-5809
    2. University of Science and Technology, Deajeon, 305-355 (South Korea)
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    • These authors contributed equally to this work.

  • Young Jin Kim,

    1. Department of Chemistry and Basic, Kyung Hee University, 1 Hoegi-dong, Dongdamun-gu, Seoul (South Korea), Fax: (+82) 2-959-6443
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    • These authors contributed equally to this work.

  • Eun Hee Jeon,

    1. Department of Chemistry and Basic, Kyung Hee University, 1 Hoegi-dong, Dongdamun-gu, Seoul (South Korea), Fax: (+82) 2-959-6443
    2. Current address: KAIST, 291 Daehak-ro (373-1 Guseong-dong), Yuseong-gu, Daejeon 305-701 (Republic of Korea)
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  • Dr. Chang Soo Kim,

    1. Clean Energy Center, Korean Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-gu, Seoul, 305-355 (South Korea), Fax: (+82) 2958-5809
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  • Prof. Hoon Sik Kim,

    Corresponding author
    1. Department of Chemistry and Basic, Kyung Hee University, 1 Hoegi-dong, Dongdamun-gu, Seoul (South Korea), Fax: (+82) 2-959-6443
    • Department of Chemistry and Basic, Kyung Hee University, 1 Hoegi-dong, Dongdamun-gu, Seoul (South Korea), Fax: (+82) 2-959-6443
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  • Dr. Hyunjoo Lee

    Corresponding author
    1. Clean Energy Center, Korean Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-gu, Seoul, 305-355 (South Korea), Fax: (+82) 2958-5809
    2. University of Science and Technology, Deajeon, 305-355 (South Korea)
    • Clean Energy Center, Korean Institute of Science and Technology, 39-1 Hawolgok-dong, Sungbuk-gu, Seoul, 305-355 (South Korea), Fax: (+82) 2958-5809
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Abstract

A new type of water-soluble ionic cellulose was obtained by means of the dissolution of cellulose in dimethylimidazolium methylphosphite at elevated temperatures over 120 °C. FTIR spectroscopy, 1H and 13C NMR spectroscopy, and elemental analysis results revealed that the repeating unit of the water-soluble cellulose consists of a dialkylimidazolium cation and a phosphite anion bonded to cellulose. The degree of phosphorylation on the cellulose chain was between 0.4 and 1.3 depending on the reaction temperature and time. With an increasing degree of phosphorylation, water solubility was increased. Scanning electron microscopy and X-ray diffraction analyses revealed that the cellulose crystalline phase in the parent crystalline cellulose changed to an amorphous phase upon transformation into ionic cellulose. Thermogravimetric analysis showed the prepared phosphorylated cellulose was stable over 250 °C and a substantial amount of residue remained at 500 °C.

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