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Adsoptive Properties of Cellulose Thermally Treated at Low Temperature and Its Solubility to Water  

Jo, Tae-Su (Div. Wood Chemistry & Microbiology, Korea Forest Research Institute)
Ahn, Byung-Jun (Div. Wood Chemistry & Microbiology, Korea Forest Research Institute)
Choi, Don-Ha (Div. Wood Chemistry & Microbiology, Korea Forest Research Institute)
Akihiko, Miyakoshi (Dep. of Material Chemistry, Asahikawa National College of Technology)
Publication Information
Journal of the Korean Wood Science and Technology / v.33, no.6, 2005 , pp. 63-70 More about this Journal
Abstract
The purpose of this study was to investigate how to modify the physical properties of cellulose after thermal treatment. Cellulose was treated between $225^{\circ}C$ and $325^{\circ}C$ for 3 hrs under air flow, and then the thermally treated cellulose was measured to specific surface area, constitute elements, consumption ofacid and base, as well as the adsorption capacity of ethylamine vapor. The higher was the treating temperature from $225^{\circ}C$ to $325^{\circ}C$, the lower was the total yield of cellulose. Elemental analysis revealed that carbon content in thermally treated cellulose was gradually increased in proportion to temperature increment. The amount of acidic functional groups tended to increase up to $300^{\circ}C$, after then to be lowered slightly. In principle, no alkaline functional groups were found in thermally treated cellulose. In case of treatment with $325^{\circ}C$, only a few amount of alkaline functional groups were detectable. Specific surface area of thermally treated cellulose are determined to $1.9m^2/g$, which value can become higher when the treated temperature rises. The thermally treated cellulose at $275^{\circ}C$ shows the highest adsorption capacity of ethylamine at $40^{\circ}C$ for 4 hrs. Solubility of those two celluloses with WPG (Weight Percent Gain) value of 113% and 108%, respectively, was determined to almost 100%. X-ray diffractogram of thermally treated cellulose suggested that the crystalline structure of cellulose began to be destroyed at the temperature of $275^{\circ}C$. As a conclusion, changes of such a physical properties make it possible to weaken inter and/or intra hydrogen bond in crystal region of cellulose macromolecules. When thermally treated cellulose adsorbs ethylamine, it turns to be well soluble to water.
Keywords
heated cellulose; specific surface area; ethylamine adsorption; solubility; boehm; functional group; X-ray diffractogram;
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Times Cited By KSCI : 2  (Citation Analysis)
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