THE STUDY OF DISTRIBUTION OF SUBSTITUENTS OF CARBOXYMETHYL CELLULOSE PRODUCED IN MEDIUM C 6H 6 C 2H 5OH

CHENG Fa; ZHAO Hua; FENG Jianxin; ZHANG Jingwu; LI Guifeng

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THE STUDY OF DISTRIBUTION OF SUBSTITUENTS OF CARBOXYMETHYL CELLULOSE PRODUCED IN MEDIUM C 6H 6 C 2H 5OH

Research Article | 更新时间：2021-03-19

- THE STUDY OF DISTRIBUTION OF SUBSTITUENTS OF CARBOXYMETHYL CELLULOSE PRODUCED IN MEDIUM C 6H 6 C 2H 5OH
- Acta Polymerica Sinica Issue 5, Pages: 524-529(1997)
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- Published：20 October 1997，
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CHENG Fa, ZHAO Hua, FENG Jianxin, ZHANG Jingwu, LI Guifeng. THE STUDY OF DISTRIBUTION OF SUBSTITUENTS OF CARBOXYMETHYL CELLULOSE PRODUCED IN MEDIUM C 6H 6 C 2H 5OH. [J]. Acta Polymerica Sinica (5):524-529(1997)
DOI：

CHENG Fa, ZHAO Hua, FENG Jianxin, ZHANG Jingwu, LI Guifeng. THE STUDY OF DISTRIBUTION OF SUBSTITUENTS OF CARBOXYMETHYL CELLULOSE PRODUCED IN MEDIUM C 6H 6 C 2H 5OH. [J]. Acta Polymerica Sinica (5):524-529(1997) DOI：

摘要

以三组份两相液体苯乙醇水为介质合成羧甲基纤维素（ＣＭＣ）

应用１ＨＮＭＲ谱图分析了ＣＭＣ中羧甲基在葡萄糖单元（ＡＧＵ）的Ｃ２、Ｃ３及Ｃ６位上对羟基的取代分布．结果表明

取代基的分布顺序是Ｃ６＞Ｃ２＞Ｃ３；当取代度（ＤＳ）低于１.０时

Ｃ２∶Ｃ３∶Ｃ６近似于１.４５∶１∶２.１５；ＤＳ高于１.０以后

分布趋于相同

通过对ＣＭＣ的Ｘ衍射分析解释了取代基分布规律．同时研究了苯的影响

证实相同取代度下

在苯乙醇水中生成的ＣＭＣ试样

其Ｃ６位取代基分布多于在乙醇水中生成的试样．

Abstract

Carboxymethyl cellulose (CMC) was produced in the medium containing benzene and 95% ethanol.Through 1H-NMR method

the distribution of carboxymethyl groups at C2

C3 and C6 positions of anhydroglucose unit (AGU) was measured and the effect of benzene was investigated.It showed that the sequence of distribution was C6>C2>C3 and when DS was lower than 1 0 C2∶C3∶C6 was 1 45∶1∶2 15 approximately;when DS was higher than 1.0 the distribution of substitution tends to be indentical.The distribution of substituent of CMC prepared in medium benzeneethanol-water at substituent had been explained by X-ray diffraction.

关键词

羧甲基纤维素苯-乙醇介质葡萄糖单元取代基分布

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