| THE UNIFORMITY OF DISTRIBUTION OF SUBSTITUENTS ALONG THE CHAIN OF CARBOXYMETHYL CELLULOSE SYNTHESIZED IN TWO-PHASE MEDIUM C_6H_6——C_2H_5OH |
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| 引用本文： | 程发,冯建新,李桂凤,王东华,张镜吾.THE UNIFORMITY OF DISTRIBUTION OF SUBSTITUENTS ALONG THE CHAIN OF CARBOXYMETHYL CELLULOSE SYNTHESIZED IN TWO-PHASE MEDIUM C_6H_6——C_2H_5OH[J].高分子科学,1998(2). |
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| 作者姓名： | 程发 冯建新 李桂凤 王东华 张镜吾 |
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| 作者单位： | Department of Chemistry，Tianjin University，Tianjin 300072，China，Department of Chemistry，Tianjin University，Tianjin 300072，China，R&D Center for Petrochemical Technology Tianjin，Tianjin 300072，China，Deparment of Chemistry，Tianjin University，Tianjin 300072，China，Deparment of Chemistry，Tianjin University，Tianjin 300072，China |
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| 摘 要： | Based on the property that carboxymethylcellulose (CMC ) can be de-graded to anhydroglucose residues by cellulase, the rate constant (K) of enzymatic degra-dation of CMC synthesized in the benzene-ethanol medium has been determined. Further-morel experimental equation K = 2.71× 10~(-2)(DS)~(-1.2) reflecting the relationship betweenK and the degree of substitution (DS) is correlated and used to describe chemical mi-crostructure uniformity of the distribution of substituents along chains effectively. Chainstructure parameters of enzymatic degradation products of CMC-the number of chainbreaks and the percentage of glucose released have been also measured. Average length ofsubstituted and unsubstituted chain segments are calculated simultaneously. Through thestudy of static and dynamic procedures of enzymatic degradation, the method to charac-terize the distribution of substituents of CMC along the chain has been improved.
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