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首页> 外文期刊>Journal of Applied Polymer Science >CHARACTERISTICS OF CARBOXYMETHYL CELLULOSE SYNTHESIZED IN TWO-PHASE MEDIUM C6H6-C2H5OH .1. DISTRIBUTION OF SUBSTITUENT GROUPS IN THE ANHYDROGLUCOSE UNIT
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CHARACTERISTICS OF CARBOXYMETHYL CELLULOSE SYNTHESIZED IN TWO-PHASE MEDIUM C6H6-C2H5OH .1. DISTRIBUTION OF SUBSTITUENT GROUPS IN THE ANHYDROGLUCOSE UNIT

机译：两相介质C6H6-C2H5OH中合成的羧甲基纤维素的特性1。无糖葡萄糖单元中取代基的分布

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Carboxymethyl cellulose was synthesized in two-phase medium containing benzene, ethanol, and water. The distribution of substitution of hydroxyl group attached to C-k Carbons (k = 2, 3, and 6) in an anhydroglucose unit (AGU) was determined by H-1-NMR method. It showed that the sequence of distribution of carboxymethyl group of the products in AGU was C-6 > C-2 > C-3; and when degree of substitution (DS) was low to 1.0, the approximate value of C-2:C-3:C-6 was 1.45:1:2.15. When DS was higher than 1.0 and increased, the distribution of substitution tends to identical. Through analysis of X-ray diffraction and calculation of crystallinity and interplanar distance of CMC, the principle of distribution of the substituent had been explained. The influence of benzene on distribution of substituent of CMC was also investigated. It was found that distribution of substituent of CMC prepared in medium benzene-ethanol at C-6 position was higher than that prepared in ethanol. (C) 1996 John Wiley & Sons, Inc. [References: 13]
机译：在含有苯，乙醇和水的两相介质中合成了羧甲基纤维素。通过H-1-NMR法求出脱水葡萄糖单元（AGU）中与C-k碳（k ＝ 2、3和6）相连的羟基的取代基的分布。结果表明，产物在AGU中的羧甲基分布顺序为C-6> C-2> C-3。取代度（DS）低至1.0时，C-2：C-3：C-6的近似值为1.45：1：2.15。当DS高于1.0并增加时，取代的分布趋于相同。通过X射线衍射分析和CMC的结晶度和晶面间距的计算，解释了取代基的分布原理。还研究了苯对CMC取代基分布的影响。发现在C-6位的中等苯-乙醇中制备的CMC的取代基的分布高于在乙醇中制备的CMC的取代基的分布。 （C）1996 John Wiley＆Sons，Inc. [参考：13]

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