Mixed effect of main electrospinning parameters on the β-phase crystallinity of electrospun PVDF nanofibers
Mixed effect of main electrospinning parameters on the β-phase crystallinity of electrospun PVDF nanofibers
复制标题
主要静电纺丝参数对静电纺PVDF纳米纤维β相结晶度的混合影响
DOI：
10.1088/1361-665x/aa7245
复制
发表时间：
2017-08-01
影响因子：
4.1
通讯作者：
Yang Xudong
中科院分区：
文献类型：
--
作者：
Hu Jiyong;Zhu Yinda;Yang Xudong
静电纺聚偏氟乙烯（PVDF）纳米纤维在制作压电器件方面已显示出其优势。虽然已经研究了静电纺丝参数对β晶相形成的影响，但它们的混合效应尚未完全了解。本研究采用两项相关实验设计，通过施加电压、针尖直径和进料流量三个典型的静电纺丝参数，系统地控制了结晶相的转变，并研究了这些参数在提高β结晶相分数中的混合相互作用。利用傅里叶变换红外光谱和x射线衍射图分析了PVDF纳米纤维的结构和晶相含量。单因子实验结果表明，三种静电纺丝参数对静电纺PVDF纳米纤维的形成和β相结晶度均有显著影响。β相的分数和结晶度均随外加电压的增加先增大后减小，并随针尖直径的增大而减小。随着进料流量的增加，β相分数呈抛物线型增加，而结晶度呈线性降低。正交实验结果表明，三种静电纺丝参数对β相结晶率的混合影响不同于单一参数，且三种参数中送料流量的影响最大。综上所述，这些结果提出了一种通过静电纺丝参数优先顺序来提高PVDF纤维β相分数的新策略。
Electrospun polyvinylidene fluoride (PVDF) nanofiber has shown its advantages of producing piezoelectric devices. Although the effect of electrospinning parameters on the formation of beta crystalline phase has been investigated, their mixed effect has not been fully understood. In this study, two dependent design of experiments were utilized to systematically control the transformation of crystalline phases by three typical electrospinning parameters, i.e. applied voltage, needle tip diameter and feeding flow rate, and the mixed interaction of these parameters in improving the fraction of beta crystalline phase was investigated. The structures and the contents of crystalline phases within PVDF nanofibers were analyzed by Fourier transform infrared spectra and x-ray diffraction patterns. The results of single factorial experiments showed that all of three electrospinning parameters have a significant effect on the formation and fraction of beta-phase crystallinity of electrospun PVDF nanofibers. Furthermore, both the fraction and the crystallinity of beta phase initially increase and then decrease with an increase of applied voltage, and consistently decrease with the needle-tip diameter. However, the beta-phase fraction parabolically increases with the increasing feeding flow rates, whereas its crystallinity linearly deceases. The orthogonal experimental results demonstrated that the mixed effect of three electrospinning parameters is different from that of single parameter on the fraction of beta-phase crystalline, and that the feeding flow rates among three parameters have the greatest effect. Taken together, these results suggested a new strategy to improve the beta-phase fraction of electrospun PVDF fibers via sequence of priority of electrospinning parameters.