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化学学报
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化学学报 ›› 1994, Vol. 52 ›› Issue (3): 243-247. 上一篇    下一篇

研究论文

壳聚糖浓溶液流变学性质研究-溶剂性质的依赖性

王伟;徐德时   

  1. 中国科学院长春应用化学研究所;中国科学院高分子物理开放实验室
  • 发布日期:1994-03-15

Rheological properties for concentrated solution of chitosan-dependence of solvents

WANG WEI;XU DESHI   

  • Published:1994-03-15

PDF

519

被引次数

8

用不同pH值的HCOOH, CH~3COOH, HCl,0.1mol.dm^-3CH~3COONa+0.2mol.dm^-3CH~3COOH水溶液为溶剂, 进行了壳聚糖浓溶液的流变学性质研究。实验结果表明, 溶剂pH值相同时, 壳聚糖在各种酸中的溶解性和溶液沾度差别较大。同一种酸中, 在可溶范围内, pH值增加, 溶剂变劣, 粘度-浓度的幂律方程指数α增大。外加盐使溶剂变劣程度增加。在任何一种酸中, 浓溶液粘度都随存放时间的延长而下降, 流动指数n减小, 流动活化能基本不变。

关键词: 溶剂, 流变性质, 壳聚糖, pH值

Rheol. properties of concentrated solution of chitosan were investigated in different solvents, such as HCOOH, CH3OOOH, HCl and 0.2 mol譫m-3 CH3COOH + 0.1 mol譫m-3 CH3COONa aqueous solns. It was shown that viscosities and flow behavior of the solns. of chitosan were dependent on the kinds of acids and the pH value of solvents. The exponent of concentration a in viscosity-concn. power law, h0 = K譪a, increased with increasing pH value, and it was significantly higher in 0.2 mol譫m-3 CH3COOH + 0.1 mol譫m-3 CH3COONa, because the solvent changed from good to poor. In addition, the stability of rheol. properties was studied.

Key words: SOLVENTS, RHEOLOGICAL PROPERTY, CHITOSAN, PH VALUE

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