Effect of fiber orientation on spinning dynamics for liquid crystalline polymer solutions using mesoscopic theory

IF 2.3 3区工程技术 Q2 MECHANICS

Rheologica Acta Pub Date : 2024-06-03 DOI:10.1007/s00397-024-01456-w

Jihun Gil, Geunyeop Park, Heon Sang Lee, Hyun Wook Jung

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Abstract

Liquid crystalline polymer (LCP) solutions undergo uniaxial elongation in fiber spinning, yielding highly oriented fibril-structured fibers with enhanced orientation and mechanical properties. This study explores how initial fiber orientation and Frank elasticity influence the dynamics and stability of the isothermal spinning process for LCP solutions. The simplified Larson-Doi mesoscopic model is employed, capable of capturing elastic stress emerging from domain structure evolution. Two main factors, inlet orientation and the Ericksen number as a parameter representing Frank elasticity, significantly affect steady-state fiber orientation profiles and the onset of draw resonance instability, as determined through linear stability analysis. The sensitivity of spinline flow to a sinusoidal disturbance is assessed using the frequency response method. Changes in stability onset concerning these two main factors are reasonably correlated with the extensional behavior of the LCP solution in the spinline and the results of the frequency response.

Graphical Abstract

Abstract Image

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利用介观理论研究纤维取向对液晶聚合物溶液纺丝动力学的影响

液晶聚合物（LCP）溶液在纤维纺丝过程中会发生单轴伸长，从而产生高度取向的纤维结构纤维，并增强其取向和机械性能。本研究探讨了初始纤维取向和弗兰克弹性如何影响 LCP 溶液等温纺丝过程的动力学和稳定性。研究采用了简化的 Larson-Doi 中观模型，该模型能够捕捉到畴结构演变过程中产生的弹性应力。通过线性稳定性分析确定，入口取向和代表弗兰克弹性的参数埃里克森数这两个主要因素会显著影响稳态纤维取向剖面和牵伸共振不稳定性的发生。使用频率响应法评估了纺丝流对正弦扰动的敏感性。关于这两个主要因素的稳定性起始变化与 LCP 解决方案在纺线中的延伸行为和频率响应结果有合理的相关性。

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来源期刊

Rheologica Acta 物理-力学

CiteScore

4.60

自引率

8.70%

发文量

审稿时长

3 months

期刊介绍： "Rheologica Acta is the official journal of The European Society of Rheology. The aim of the journal is to advance the science of rheology, by publishing high quality peer reviewed articles, invited reviews and peer reviewed short communications. The Scope of Rheologica Acta includes: - Advances in rheometrical and rheo-physical techniques, rheo-optics, microrheology - Rheology of soft matter systems, including polymer melts and solutions, colloidal dispersions, cement, ceramics, glasses, gels, emulsions, surfactant systems, liquid crystals, biomaterials and food. - Rheology of Solids, chemo-rheology - Electro and magnetorheology - Theory of rheology - Non-Newtonian fluid mechanics, complex fluids in microfluidic devices and flow instabilities - Interfacial rheology Rheologica Acta aims to publish papers which represent a substantial advance in the field, mere data reports or incremental work will not be considered. Priority will be given to papers that are methodological in nature and are beneficial to a wide range of material classes. It should also be noted that the list of topics given above is meant to be representative, not exhaustive. The editors welcome feedback on the journal and suggestions for reviews and comments."