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首页> 外文期刊>Journal of Applied Polymer Science >Altering the viscosity of cationically modified cellulose polymers by the addition of salt
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Altering the viscosity of cationically modified cellulose polymers by the addition of salt

机译：通过添加盐改变阳离子改性纤维素聚合物的粘度

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摘要

The concentration dependence of viscosity is examined for four cationically modified cellulose polymers (UCARE JR400, UCARE JR30M, UCARE LR400, and UCARE LR30M) in both salt-free and 50 mM NaCl solution. Similarities in the four polymer systems include: Newtonian viscosity in the dilute regime, shear thinning at higher concentrations, four concentration regimes in salt-free solution, and three concentration regimes in salt solution. The zero shear rate viscosity and the degree of shear thinning increase with increasing polymer concentration in both salt and salt-free solutions. While the addition of salt to the lower molecular weight polymers JR400 and LR400 resulted in small changes in viscosity across all concentrations, JR30M and LR30M exhibited significant decreases (up to 81%) and increases (up to 57%) in viscosity upon the addition of salt in the semidilute and entangled regimes, respectively. This viscosity increase in the entangled regime (when comparing salt-free and 50 mM NaCl solutions) is reported for the first time in cationically modified cellulose polymers. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41616.
机译：在无盐和50 mM NaCl溶液中，对四种阳离子改性纤维素聚合物（UCARE JR400，UCARE JR30M，UCARE LR400和UCARE LR30M）的粘度浓度依赖性进行了检查。四种聚合物体系的相似之处包括：稀溶液中的牛顿粘度，较高浓度下的剪切稀化，无盐溶液中的四种浓度方案和盐溶液中的三种浓度方案。在盐溶液和无盐溶液中，零剪切速率粘度和剪切稀化程度都随聚合物浓度的增加而增加。在较低分子量的聚合物JR400和LR400中加盐会导致粘度在所有浓度下均发生微小变化，而JR30M和LR30M在添加低分子量聚合物后表现出粘度的显着降低（最高81％）和粘度增加（最高57％）。在半稀释和纠缠态下分别添加盐。缠结状态下的这种粘度增加（在比较无盐溶液和50 mM NaCl溶液时）首次在阳离子改性纤维素聚合物中报道。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41616。

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