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篇目详细内容 |
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【篇名】 |
Effects of dispersed medium systems on substitution pattern and solution performance of carboxymethyl cellulose |
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【刊名】 |
Frontiers of Materials Science in China |
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【刊名缩写】 |
Front. Mater. Sci. China |
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【ISSN】 |
1673-7377 |
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【EISSN】 |
1673-7482 |
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【DOI】 |
10.1007/s11706-010-0097-x |
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【出版社】 |
Higher Education Press and Springer-Verlag Berlin
Heidelberg |
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【出版年】 |
2010 |
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【卷期】 |
4
卷3期 |
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【页码】 |
306-313
页,共
8
页 |
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【作者】 |
Bo LI;
Zi-Qiang SHAO;
Jie-Min HONG;
Fei-Jun WANG;
You-De ZHANG;
Bing LIAO;
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【关键词】 |
degree of substitution; alkalization; substitution uniformity; molecular interaction; aggregation |
【摘要】 |
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Effects of three dispersed medium systems consisting of isopropyl alcohol (IPA), ethyl alcohol (EtOH) and toluene (TOL) on the substitution patterns of carboxymethyl cellulose (CMC) were studied, and the corresponding influences on solution performances were investigated on a rheometer. In EtOH-IPA system, the structure of higher average substitution degree and enlarged partial substitution degrees disparity (determined by 1H nuclear magnetic resonance) but lower distribution uniformity along molecular chains (speculated from static/dynamic light scattering) were characterized by which the thixotropy and apparent viscosity of solution decreased due to the aggregation of longer unsubstituted segments. For the phase separation (identified by gas chromatography) of TOL-IPA system, considerable unsubstituted regions in the structure aggregated into hydrophobic centers to form swollen macrogel particles in solution, leading to the sharp rise in apparent viscosity and almost constant flow-behavior index with hardly any thixotropic behaviors presented. |
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