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http://dx.doi.org/10.7584/ktappi.2013.45.3.059

Changes in the Properties of Cotton Cellulose by Hydrogen Peroxide Bleaching  

Heo, Yong-Dae (Korea Minting, Security Printing & ID Card Operation Corporation, Technology Research Institute)
Sung, Yong Joo (Dept. of Biobased Materials, Chungnam National University)
Joung, Yang-Jin (Korea Minting, Security Printing & ID Card Operation Corporation, Technology Research Institute)
Kim, Duk-Ki (Korea Minting, Security Printing & ID Card Operation Corporation, Technology Research Institute)
Kim, Tae-Young (Korea Minting, Security Printing & ID Card Operation Corporation, Technology Research Institute)
Publication Information
Journal of Korea Technical Association of The Pulp and Paper Industry / v.45, no.3, 2013 , pp. 59-68 More about this Journal
Abstract
The cotton contains various impurities such as protein, wax, pectins, coloring matter, even though cotton has been a major source of pure cellulose. The purification processes have been commonly applied to obtain the pure cellulose. However the excessive purification treatments could lead to the damage in the cellulose structure which could result in the degradation of cellulose and the limited application of cotton cellulose. In this study, the changes in cellulose structural properties such as crystallinity and DP(degree of polymerization) by the various conditions of the purification processes were investigated. The less toxic agents such as hydrogen peroxide and sodium silicate were applied for the purification treatment in this study. The increase in the process times, the temperature and the applied amount of chemical agents resulted in the more purified cellulose. The DP of cotton cellulose was increased at the first weak conditions by the reduction of small molecules such as pectin, wax, and so on. Especially the 2 % addition amount of $H_2O_2$ with $Na_2SiO_3$ resulted in the higher value in the DP and the brightness compared to the 1.5 % addition amount of $H_2O_2$. However, the 4 % addition amount of $H_2O_2$ with $Na_2SiO_3$ showed the decreased value because of excessive treatment. In case of the changes in the crystallinity (Gjk), the highest value of the crystallinity was obtained by the 2% addition amount of $H_2O_2$ on the cotton cellulose, which showed similar with the change in the DP.
Keywords
Cotton; cellulose; crystallinity; DP; hydrogen peroxide; sodium silicate;
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