N,O-羧化壳聚糖溶液的流动性、触变性以及动态粘弹性研究

魏燕霞; 谢瑞; 丁采荷; 杨建鹏; 张继

doi:10.13386/j.issn1002-0306.2016.14.011

N,O-羧化壳聚糖溶液的流动性、触变性以及动态粘弹性研究

魏燕霞^1,2,
谢瑞^1,2,
丁采荷¹,
杨建鹏¹,
张继^1,2

1. 西北师范大学生命科学学院
2. 甘肃省特色植物有效成分制品工程技术研究中心

基金项目:

国家科技支撑计划(2012BAD20B06-07)；

详细信息

作者简介:
魏燕霞(1989-),女,硕士研究生,主要从事天然聚合物胶体等的流变性研究,E-mail:melody_wyx@126.com。;

张继(1963-),女,教授,主要从事植物资源的开发与利用方面的研究,E-mail:Zhangj@nwnu.edu.cn。;

中图分类号: TS201.7
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出版历程
- 收稿日期: 2015-11-10

The flow behavior,thixotropy and dynamical viscoelasticity of N,O- carboxymethyl chitosan solutions

College of Life Science,Northwest Normal University
Bioactive Products Engineering and Technology Research Center for Gansu Distinctive Plants

摘要

摘要: 通过分析25℃条件下N,O-羧化壳聚糖溶液的流动性、触变性以及动态粘弹性来研究其流变性能,并利用Power-law和Cross模型对其流动性进行了拟合分析。结果表明:低浓度的N,O-羧化壳聚糖溶液（0.01%¹%）表现为牛顿流体的特性,较高浓度的溶液体系（5%¹5%）表现为剪切变稀的假塑性流体的特性,其流动性符合流变学的Cross模型,且浓度越高,临界剪切速率越小;随着溶液浓度的增大,触变性越强,结构不易恢复,表明溶液体系对时间的依赖性越大;在整个动态测试中,低频率下,G″>G’,表现出类似于液体的粘弹性行为,随着频率的增大,溶液体系表现为类似于固体的弹性行为（G’>G″）,G″与G’交点的出现依赖于N,O-羧化壳聚糖溶液浓度的变化。
- N,O-羧化壳聚糖 /
- Power-law模型 /
- Cross模型 /
- 触变性 /
- 动态粘弹性
Abstract: The flow behavior,thixotropy and dynamical viscoelasticity of N,O- carboxymethyl chitosan solutions were measured by steady- shear and small- amplitude oscillatory experiments,respectively.Power- law and Cross models were used to analyze the flow properties of the systems. The results showed that N,O- carboxymethyl chitosan solutions exhibited two different flow behaviors due to the variation of concentration. When the N,O-carboxymethyl chitosan solutions was in low concentrations( 0.01% ~ 1%),the systems exhibited obvious characteristics of Newton fluid.However,shear- thinning regions were observed and found to be well correlated to the Cross model for high concentrations of N,O- carboxymethyl chitosan solutions( 5% ~15%).The variation of the hysteresis loops area suggested a stronger thixotropic behavior as the polymer concentration increased.Dynamical viscoelastic properties showed a transition from fluid- like( G″ > G') to gel- like( G' > G″) structure with the increase of frequency,and the appearance of cross point was dependent on the concentrations of N,O- carboxymethyl chitosan solutions.
- N,O-carboxymethyl chitosan /
- Power-law model /
- Cross model /
- thixotropic properties /
- dynamical viscoelastic properties

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