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首页> 外文期刊>Journal of Applied Polymer Science >Liquid crystal behavior of cellulose nanoparticles-ethyl cellulose composites: Preparation, characterization, and rheology
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Liquid crystal behavior of cellulose nanoparticles-ethyl cellulose composites: Preparation, characterization, and rheology

机译：纤维素纳米颗粒 - 乙基纤维素复合材料的液晶行为：制备，表征和流变学

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摘要

This work deals with assessing the approach for preparation of cellulose nanoparticles (CNPs) to be acted as synergistic component in liquid crystal (LC) ethyl cellulose composite (EC-CNPs). In this respect different structures of CNPs were prepared by acid and salt agents. These prepared CNPs were characterized by carboxyl content, IR, transmission electron microscope (TEM), and zeta potential, while their composites with EC were characterized by rheological measurements as a key factor for measuring the critical concentration of LC behavior. The results showed that, the crystallinity of CNPs obtained by ammonium persulfate exceeded that prepared by sulfuric acid hydrolysis. TEM images of stained CNPs showed both methods led to produce nanoparticles have rod like shape with aspect ratio (L/W) between 7.69 +/- 3 and 31.3 +/- 5. For the rheological measurements, it demonstrated the efficient of incorporating the CNPs to EC (EC-CNPs composites) to decrease the critical concentration of EC from 40 wt% to approximately 34 wt%.
机译：这项工作涉及评估纤维素纳米颗粒（CNPs）作为液晶（LC）乙基纤维素复合材料（EC CNPs）中的协同组分的制备方法。在这方面，通过酸剂和盐剂制备了不同结构的CNPs。通过羧基含量、红外光谱、透射电镜（TEM）和zeta电位对制备的CNP进行了表征，而通过流变学测量对其与EC的复合材料进行了表征，这是测量LC行为临界浓度的关键因素。结果表明，过硫酸铵法制备的CNPs结晶度高于硫酸水解法制备的CNPs结晶度。染色的CNPs的TEM图像显示，两种方法都可以制备出长宽比（L/W）在7.69+/-3和31.3+/-5之间的棒状纳米颗粒。对于流变测量，它证明了将CNPs加入EC（EC-CNPs复合材料）的有效性，从而将EC的临界浓度从40 wt%降至约34 wt%。

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