Substituent Distribution of Cyanoethyl Cellulose |
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Authors: | Eiko Nakayama Jun-Ichi Azuma |
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Institution: | (1) Department of Living Arts, Faculty of Living Science, Showa Women's' University, Setagaya-ku, Tokyo, 154-8533, Japan;(2) Laboratory of Recycle System of Biomass, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8520, Japan |
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Abstract: | Estimation of the substitution distribution for cyanoethyl cellulose was carried out by 1H and 13C NMR spectroscopic analyses after the additional acetylation. Based on the complemental function of cyanoethyl and acetyl substituents, the degree of substitution (DS) of cyanoethyl groups could be calculated from the ratios of the 1H integrated intensities in acetyl methyl ( 1.8–2.1) and cyanoethyl methylene ( 2.6–2.9) protons, and also from the corresponding ratios for acetyl methyl carbon signals ( 19.7–21.3) and cyanoethyl methylene carbon signals ( 17.5–19.0). Good agreement was obtained between the DS values obtained from the NMR spectroscopic analyses and those determined by the conventional nitrogen content method, indicating the validity of the NMR method used. In addition, the NMR method was found to be effective in determining the positional substituent distribution by the quantitative analysis of the three cyan carbon signals ( 118–120). |
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Keywords: | cyanoethyl cellulose 1H and 13C NMR spectroscopies two-dimensional NMR analysis cyanoethyl cellulose acetate substituent distribution |
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