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| Effect of Temperature and Concentration on the Viscosity of Chitosan Solution in Water/Ethanol Mixed Solvent |
| YANG Shuai, ZHANG Keke, CUI Jing, ZHANG Dawei
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| Institute of Materials Science and Engineering, Northeast Forestry University, Harbin 150040 |
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Abstract The change low of viscosity of chitosan solution in water/ethanol mixed solvent with the temperature and concentration was investigated. Water with 1% (volume) acetic acid added was used as the good solvent. Ethanol, an organic solvent, was the poor solvent. Different proportion of ethanol volume mixed with water solution was acted as poor solvents which could provide solubility of regular difference, respectively. Ubbelohde viscometer was used as the viscosity measuring instrument. And the change low of viscosity of chitosan solution with temperature and concentration was measured. The experimental results showed that the viscosity of chitosan solution reduced with the increasing of temperature. And it would be increased with the increasing of concentration, following the constant temperature. When chitosan solution was in good solvent, the change rate of specific viscosity was higher than that in poor solvent. With the increasing of concentration, the change rate of specific viscosity was increased correspondingly. In the extremely dilute concentration, the(ηsp/C)/C curve of chitosan solution would appear abnormal phenomenon where the viscosity of chitosan solution increased sharply with the decreasing of concentration.
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Published: 08 May 2018
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2017, Vol. 31 
