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波浪形聚苯乙烯纤维的静电纺丝制备原理及其振幅影响因素

发表时间:2015-12-15  浏览量:1551  下载量:782
全部作者: 王德昕,陈志宏,王一龙,李善霖,赵素玲
作者单位: 武汉理工大学材料复合新技术国家重点实验室;武汉理工大学材料研究与测试中心;武汉理工大学理学院;武汉理工大学化学化工与生命科学学院
摘 要: 以聚苯乙烯(polystyrene,PS)/二甲基甲酰胺(dimethylformamide,DMF)溶液为例,研究了波浪形聚合物纤维在静电纺丝中的形成过程和制备原理,探索了波浪形纤维的振幅随收集板移动速度、纺丝电压和针头-收集板间距的变化规律,并制备了不同图案的波浪纤维阵列。研究发现,随着收集板速度的增加,聚合物纤维的形貌沿着线圈形、“W”形、波浪形和直线形的规律变化。对波浪形纤维振幅与收集板速度之间的关系进行分析,发现波浪形纤维与直线形纤维之间的转变属于Hopf分岔,即由垂直于收集板移动方向上的非线性扰动产生具有O(2)对称性的Hopf分岔,导致波浪纤维的产生。波浪形纤维与“W”形纤维的转变可能来源于射流与收集板接触点在横向和纵向上运动模式的改变。波浪形纤维的振幅极大值出现在波浪形与“W”形纤维转变处,且该振幅极大值随纺丝电压和针头-收集板间距的增加而增大;波浪形与“W”形纤维的临界转变速度随纺丝电压的增加而增加。研究成功制备了单轴取向、正交和45°交叉3种波浪形纤维阵列,有助于推进波浪形纤维在柔性电子器件中的应用。
关 键 词: 有机高分子材料;制备原理;Hopf分岔;振幅调控;静电纺丝;波浪形聚苯乙烯纤维
Title: Preparation mechanism and amplitude manipulation of wavy polystyrene fibers in electrospinning
Author: WANG Dexin, CHEN Zhihong, WANG Yilong, LI Shanlin, ZHAO Suling
Organization: State Key Laboratory of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology; Center for Material Research and Testing, Wuhan University of Technology; School of Science, Wuhan University of Technology; School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology
Abstract: In this paper, we investigated the morphology change and formation mechanism of wavy microfibers produced in electrospinning by taking polystyrene (PS)/dimethylformamide (DMF) solution as an example. The effect of electrospinning parameters including voltage and nozzle-to-collector distance, on the amplitude of wavy fibers was explored. Several kinds of arrays consisting of wavy microfibers was prepared. Our results showed that with the increase of collector speed, PS microfibers experienced the conversion in morphology from translated coiling to W-shaped microfibers, then to wavy microfibers, and finally to straight fibers. Further analysis on the relationship between the amplitude and collector speed indicates that the conversion from wavy fibers to straight fibers follows the Hopf bifurcation, i.e. the nonlinear perturbation in the direction perpendicular to the movement of collector generates Hopf bifurcation with O(2) symmetry and initiate the formation of wavy fibers. The conversion between wavy fiber and W-shaped fiber may be induced by the change in the kinematic mode of perturbation in the longitudinal and transverse direction to the movement of collector. Wavy fiber with maximum amplitude located at the position where the fiber changed from W-shaped fiber into wavy fiber. The value of maximum amplitude and critical collector speed increased with the increase of voltage and nozzle-to- collector distance. We managed to produce arrays consisting of uniaxially aligned, 90° cross-stacked and 45° cross-stacked wavy fibers, which are potential candidates to prepare stretchable electronics.
Key words: organic macromolecule materials; preparation mechanism; Hopf bifurcation; amplitude manipulation; electrospinning; wavy polystyrene fibers
发表期数: 2015年12月第23期
引用格式: 王德昕,陈志宏,王一龙,等. 波浪形聚苯乙烯纤维的静电纺丝制备原理及其振幅影响因素[J]. 中国科技论文在线精品论文,2015,8(23):2466-2473.
 
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