Influence of surface charge on viscosity behavior of cellulose microcrystal suspension |
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Authors: | Jun Araki Masahisa Wada Shigenori Kuga Takeshi Okano |
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Affiliation: | (1) Department of Biomaterials Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, 113-8657 Tokyo, Japan |
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Abstract: | Microcrystalline cellulose with minimal surface charge was prepared from softwood kraft pulp via hydrolysis by 4N hydrochloric acid instead of sulfuric acid. To this material, sulfate ester groups as surface charge were introduced by treating with 55% (w/w) sulfuric acid. A treatment at 60°C for 2h gave nearly the same level of surface charge as that of the H2SO4 -hydrolyzed microcrystal. The number of sulfate groups were controlled by changing the H2SO4 treatment conditions. Although the microscopic size and shape of the microcrystalline particles were the same irrespective of the preparation method, the introduction of surface charge drastically reduced the viscosity and removed its time dependence. These changes in viscosity behavior are considered to result from charge-induced dispersion of loose aggregates existing in the initial charge-free microcrystals prepared by HCl hydrolysis.Part of this report was presented at the 48th annual meeting of the Japan Wood Research Society, Shizuoka, April 1998 |
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Keywords: | Cellulose microcrystal Sulfate ester Surface charge Viscosity behavior |
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