The liquid crystalline order, rheology and their correlation in chitin whiskers suspensions
The liquid crystalline order, rheology and their correlation in chitin whiskers suspensions
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甲壳素晶须悬浮液中的液晶秩序、流变学及其相关性
DOI：
10.1016/j.carbpol.2019.01.006
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发表时间：
2019-04-01
影响因子：
11.2
通讯作者：
Luo, Binghong
中科院分区：
文献类型：
--
作者：
Li, Wenling;Liu, Wenjun;Luo, Binghong
为了探讨液晶态甲壳素晶须（CHWs）水悬浮液的浓度范围，以及CHWs悬浮液液晶特性与流变学的相关性，制备了不同CHWs浓度、pH值、离子强度和温度的CHWs水悬浮液。通过偏光显微镜和旋转流变仪研究了所得悬浮液的液晶特性和流变性能。结果表明，悬浮液的液晶态在CHWs浓度为3.5wt％时出现，并在22.5wt％时消失。随着CHWs浓度、pH值和离子强度的增加，弹性模量(G')和粘性模量(G")值增加，液晶织构基本变得越来越规则和明显。而且G"/G'值始终小于1，表明CHWs水悬浮液具有弹性行为。此外，加热对弹性模量造成的影响是不可逆的。
To explore the concentration range of chitin whiskers (CHWs) aqueous suspensions with the liquid crystalline state, and the correlation between liquid crystalline characteristic and rheology of CHWs suspensions, the CHWs aqueous suspensions with different CHWs concentration, pH value, ionic strength and temperature were prepared. The liquid crystalline characteristic and rheological properties of the obtained suspensions were investigated by polarizing microscope and rotational rheometer. The results showed that the liquid crystalline state of the suspensions appeared at the CHWs concentration of 3.5 wt% and disappeared at 22.5 wt%. Increasing the CHWs concentration, pH value and ionic strength, the values of elastic modulus (G') and viscous modulus (G") increased, and the liquid crystal texture basically became more and more regular and obvious. Moreover, the value of G"/G' was always less than 1, suggesting the elastic behavior of CHWs aqueous suspension. Besides, the effect caused by heating on the elastic modulus was irreversible.