| NMR法研究羧甲基羟丙基纤维素的取代结构 |
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| 引用本文： | 许凯,王恩浦,刘跃平,黎秉环,L.Yuan. NMR法研究羧甲基羟丙基纤维素的取代结构[J]. 纤维素科学与技术, 1993, 0(2) |
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| 作者姓名： | 许凯 王恩浦 刘跃平 黎秉环 L.Yuan |
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| 作者单位： | 中国科学院广州化学研究所，中国科学院广州化学研究所，中国科学院广州化学研究所，中国科学院广州化学研究所，美国纽约市立大学 |
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| 摘 要： | 羧甲基羟两基纤维素(CMHPC)经水解和乙酰化反应后,利用~1H NMR和~(13)C NMR谱确定其取代度和取代基分布,提出了纤维素葡萄糖单元上羟基的相对反应活性顺序。
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| 关 键 词： | 羧甲基羟丙基纤维素 取代基分布 核磁共振 |
DETERMINATION OF SUBSTITUENT DISTRIBUTION IN CARBOXYMETHYL HYDROXYPROPYL CELLULOSE BY MEANS OF ~1H-NMR AND ~(13)C-NMR SPECTRA |
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| Xu Kai,Wang Enpu,Liu Yueping,Li Binhuan Guangzhou Institute of Chemistry,Chinese Academy of Sciences,Guangzhou,China L. Yuan,The City College,New York,USA. DETERMINATION OF SUBSTITUENT DISTRIBUTION IN CARBOXYMETHYL HYDROXYPROPYL CELLULOSE BY MEANS OF ~1H-NMR AND ~(13)C-NMR SPECTRA[J]. Journal of Cellulose Science and Technology, 1993, 0(2) |
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| Authors: | Xu Kai Wang Enpu Liu Yueping Li Binhuan Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou China L. Yuan The City College New York USA |
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| Abstract: | Information about the degree of substitution(DS) and the molar substitution(MS) in carboxymethyl hydroxypropyl cellulose(CMHPC) was studied by means of ~1H-NMR analysis after hydrolysis and acetylation pretreatment. The results were found to be in good agreement with that obtained from ASTM method. The ~(13)C-NMR signals of treated CMHPC samples in DMSO were well-resolved and separated, reflecting the detailed structural parameters, and allowing determination of sustituent distribution in CMHPC. Estimation indicated that the relative reactivity of hydroxyl groups on glucose residue toward etherification is OH-6 OH-2 OH-3 when the total degree of substitution is higher. |
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| Keywords: | carboxymethyl hydroxypropyl cellulose substituent distribution NMR |
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