Ionic‐Liquid‐Derived,Water‐Soluble Ionic Cellulose |
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| Authors: | Huyen Thanh Vo Young Jin Kim Eun Hee Jeon Dr Chang Soo Kim Prof Hoon Sik Kim Dr Hyunjoo Lee |
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| Institution: | 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);3. Department of Chemistry and Basic, Kyung Hee University, 1 Hoegi‐dong, Dongdamun‐gu, Seoul (South Korea), Fax: (+82)?2‐959‐6443;4. Current address: KAIST, 291 Daehak‐ro (373‐1 Guseong‐dong), Yuseong‐gu, Daejeon 305‐701 (Republic of Korea) |
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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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| Keywords: | cellulose ionic liquids phosphorylation water solubility X‐ray diffraction |
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