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１ＨＮＭＲ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１０时，Ｃ２∶Ｃ３∶Ｃ６近似于１４５∶１∶２１５；ＤＳ高于１０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．
Carboxymethyl cellulose (CMC) was produced in the medium containing benzene and 95% ethanol.Through 1H NMR method,the distribution of carboxymethyl groups at C 2,C 3 and C 6 positions of anhydroglucose unit (AGU) was measured and the effect of benzene was investigated.It showed that the sequence of distribution was C 6>C 2>C 3 and when DS was lower than 1 0 C 2∶C 3∶C 6 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 C 6 position was higher than that in ethanol with same DS .The principle of distribution of substituent had been explained by X ray diffraction.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1997年第5期524-529,共6页
Acta Polymerica Sinica
关键词
羧甲基纤维素
CMC
葡萄糖单元
取代基分布
Carboxymethyl Cellulose,Medium benzene ethanol,Anhydroglucose unit,Distribution of substituent
