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添加纤维素纳米晶体对聚合物流变学的影响。

Influence of Added Cellulose Nanocrystals on the Rheology of Polymers.

作者信息

Pal Rajinder, Deshpande Parth, Patel Smit

机构信息

Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.

出版信息

Nanomaterials (Basel). 2025 Jan 9;15(2):95. doi: 10.3390/nano15020095.

DOI:10.3390/nano15020095
PMID:39852710
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11767267/
Abstract

The interactions between cellulose nanocrystals and six different polymers (three anionic, two non-ionic, and one cationic) were investigated using rheological measurements of aqueous solutions of nanocrystals and polymers. The experimental viscosity data could be described adequately by a power-law model. The variations in power-law parameters (consistency index and flow behavior index) with concentrations of nanocrystals and polymers were determined for different combinations of nanocrystals and polymers. The interactions between nanocrystals and the following polymers: anionic sodium carboxymethyl cellulose and non-ionic guar gum, were found to be strong in that the consistency index increased substantially with the addition of nanocrystals to polymer solutions. The interaction between nanocrystals and non-ionic polymer polyethylene oxide was moderate. Depending on the concentrations of nanocrystals and polymer, the consistency index both increased and decreased upon the addition of nanocrystals to polymer solution. The interactions between nanocrystals and the following polymers: anionic xanthan gum, anionic polyacrylamide, and cationic quaternary ammonium salt of hydroxyethyl cellulose, were found to be weak. The changes in rheological properties with nanocrystal addition to these polymer solutions were found to be small or negligible.

摘要

通过对纳米晶体和聚合物水溶液进行流变学测量，研究了纤维素纳米晶体与六种不同聚合物（三种阴离子型、两种非离子型和一种阳离子型）之间的相互作用。实验粘度数据可以用幂律模型充分描述。针对纳米晶体和聚合物的不同组合，测定了幂律参数（稠度指数和流动行为指数）随纳米晶体和聚合物浓度的变化。发现纳米晶体与以下聚合物之间的相互作用很强：阴离子型羧甲基纤维素钠和非离子型瓜尔胶，因为在聚合物溶液中加入纳米晶体后，稠度指数大幅增加。纳米晶体与非离子聚合物聚环氧乙烷之间的相互作用中等。根据纳米晶体和聚合物的浓度，在聚合物溶液中加入纳米晶体后，稠度指数既有增加也有降低。发现纳米晶体与以下聚合物之间的相互作用较弱：阴离子型黄原胶、阴离子型聚丙烯酰胺和阳离子型羟乙基纤维素季铵盐。在这些聚合物溶液中加入纳米晶体后，流变性能的变化很小或可以忽略不计。

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