| A METHOD OF PREPARING SPHERICAL NANO-CRYSTAL CELLULOSE WITH MIXED CRYSTALLINE FORMS OF CELLULOSE Ⅰ AND Ⅱ |
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| 作者姓名： | Xiao-fang Li En-yong Ding Guo-kang Li Laboratory of Cellulose and Lignocellulosics Chemistry Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou 510650 China College of Material Science and Engineering South China University of Technology Guangzhou 510641 China |
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| 作者单位： | Xiao-fang Li;En-yong Ding;Guo-kang Li;Laboratory of Cellulose and Lignocellulosics Chemistry，Guangzhou Institute of Chemistry，Chinese Academy of Sciences，Guangzhou 510650 China College of Material Science and Engineering South China University of Technology，Guangzhou 510641，China |
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| 基金项目： | This work was supported by the Special Funds for Major State Basic Research Projects (95-12 and G1999064800). |
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| 摘 要： | A new kind of nano-crysta cellulose (NCC) prepared from natural cotton fiber has been obtained by the method ofacid hydrolysis. Compared to most other nanophase materials that derive from inorganic materials, our products are preparedfrom natural cotton fibers. The products are of spherical shape with mixed crystal forms of cellulose I and II. The preparationconditions determine the properties of the products. Prior treatment is a critical procedure. The properties of the products arealso strongly affected by such conditions as the kinds of acids used, the ratio of the acid mixture, the acid concentration, theultrasonic agitation time and hydrolysis temperature. The number average molecular weight of NCC is determined by gelpermeation chromatography (GPC). The particle size and shape were determined by transmission electron microscopy(TEM). X-ray diffraction was used to detect the crystallinity and average crystallite size of the panicle.
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| 关 键 词： | Spherical nano-crystal cellulose Mixed crystal forms of cellulose Ⅰ and Ⅱ Ultrasonic agitation |
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