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当前位置: 首页 > 文章 > 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 食品工业科技 2016,37 (14) 98-101+107
Position: Home > Articles > The flow behavior,thixotropy and dynamical viscoelasticity of N,O- carboxymethyl chitosan solutions Science and Technology of Food Industry 2016,37 (14) 98-101+107

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

作  者：
魏燕霞;谢瑞;丁采荷;杨建鹏;张继
单  位：
西北师范大学生命科学学院
关键词：
N;O-羧化壳聚糖;Power-law模型;Cross模型;触变性;动态粘弹性
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。
译  名：
The flow behavior,thixotropy and dynamical viscoelasticity of N,O- carboxymethyl chitosan solutions
作  者：
WEI Yan- xia;XIE Rui;DING Cai-he;YANG jian-peng;ZHANG Ji;College of Life Science,Northwest Normal University;Bioactive Products Engineering and Technology Research Center for Gansu Distinctive Plants;
关键词：
N,O-carboxymethyl chitosan;;Power-law model;;Cross model;;thixotropic properties;;dynamical viscoelastic properties
摘  要：
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.

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