Crystal transition from hydrated chitosan and chitosan/monocarboxylic acid complex to anhydrous chitosan investigated by X‐ray diffraction |
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| Authors: | Philip‐Kunio Naito Yu Ogawa Satoshi Kimura Tadahisa Iwata Masahisa Wada |
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| Affiliation: | 1. Department of Biomaterials Sciences, Graduate School of Agricultural and Life Sciences, the University of Tokyo, Bunkyo‐ku, Tokyo, Japan;2. Centre de Recherches sur les Macromolécules Végétales, France;3. Department of Plant & Environmental New Resources, College of Life Sciences, Kyung Hee University, Yongin‐si, Gyeonggi‐do, Korea;4. Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Sakyo‐ku, Kyoto, Japan |
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| Abstract: | We have studied the crystal transition behaviors from hydrated chitosan to anhydrous chitosan by X‐ray diffraction analyses. Hydrated chitosan prepared by deacetylation of crustacean α‐chitin was subjected to the two conversion methods, hydrothermal treatment and high‐humidity treatment via chitosan/monocarboxylic acid complex. The transition by hydrothermal treatment progressed with increasing treatment temperature and time, and the rapid transition occurred above 200 °C. Chitosan/acetic acid complex and chitosan/formic acid complex were prepared by immersing hydrated chitosan in acid solution. The transition from chitosan/acetic acid complex to anhydrous chitosan in high relative humidity condition proceeded with increasing temperature and was complete at 80 °C for 1 h, whereas chitosan/formic acid complex did not convert to anhydrous chitosan under the same conditions. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015 , 53, 1065–1069 |
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| Keywords: | chitosan crystal transition polymorphism WAXS |
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