Journal of the Taiwan Institute of Chemical Engineers ( IF 5.5 ) Pub Date : 2022-01-21 , DOI: 10.1016/j.jtice.2022.104215 Wasif Razzaq 1, 2 , Christophe A. Serra 1 , Leandro Jacomine 1 , Delphine Chan-Seng 1
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Background
fiber diameter is one of the most important morphological parameters which drives the applications of microfibers. This creates a need for the development of processes capable of producing a large variety of microfibers with a given diameter. To this regards, microfluidic spinning has recently emerged as an outstanding and simple technique for the production of micro- and nanofibers with controllable size and morphology.
Methods
herein, microfibers were produced from (macro)monomers or prepolymers (core phase) by in situ photoirradiation using a capillary-based microfluidic device and a miscible sheath phase of various viscosity. The effects of the flow rate of both phases as well as the viscosity of the sheath fluid, the capillary dimensions and the monomer volume fraction in the core phase were thoroughly studied.
Significant findings
by calculating the capillary number ratio from the ratios of sheath to core flow rate and viscosity, an empirical relationship which perfectly predicts the microfiber diameter as a function of monomer volume fraction, the capillary number ratio and capillary inner diameter but independent of its outer diameter is extracted. This result paves the way to the continuous-flow production of microfibers with well-controlled morphological characteristics.
中文翻译：
聚合物微纤维的微流体加工：操作和材料参数对纤维直径的影响
背景
纤维直径是驱动微纤维应用的最重要的形态参数之一。这就需要开发能够生产多种具有给定直径的微纤维的工艺。在这方面，微流体纺丝最近已成为一种出色且简单的技术，可用于生产具有可控尺寸和形态的微米和纳米纤维。
方法
在本文中，微纤维是由（大）单体或预聚物（芯相）通过原位光辐照使用基于毛细管的微流体装置和各种粘度的混溶鞘相生产的。深入研究了两相流速以及鞘液粘度、毛细管尺寸和芯相中单体体积分数的影响。
重要发现
通过从皮芯流速和粘度的比率计算毛细管数比，可以完美预测微纤维直径作为单体体积分数、毛细管数比和毛细管内径但独立于其外径的函数的经验关系是提取。这一结果为连续流动生产具有良好控制的形态特征的微纤维铺平了道路。
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