溶液参数对静电纺聚偏氟乙烯纳米纤维相形成及形态的影响
Influence of Solution Parameters on Phase Formation and Morphology of Electrospun Poly(vinylidene fluoride) Nanofiber
摘要：
采用静电纺丝法制备了聚偏氟乙烯（PVDF）纳米纤维，研究了PVDF浓度、DMF：丙酮比例等静电纺丝工艺参数对不同相（α、\b{eta}和γ）的形成及所需形貌的影响。通过对峰进行去卷积，对X射线衍射（XRD）和傅里叶变换红外（FTIR）光谱仪数据进行详细分析，以分配和准确识别与特定PVDF相相关的峰。SEM显微照片进一步有助于理解所需的\b{eta} -相的机理以及获得无珠纳米纤维的条件。有趣的是，发现相的形成机制主要受表面张力和粘度之间的平衡控制，该平衡由溶液中PVDF浓度和丙酮含量控制。发现20%（w/v）的PVDF浓度和DMF：丙酮比率1：1适合于在完全无珠的纳米纤维中的最大\b{eta}相。所需的相和形态的基本机制的方法和理解建议的指导方针，优化\b{eta}相和无珠纤维的PVDF基纳米复合材料以及。
英文摘要：
Poly(vinylidene fluoride), PVDF nanofibers were prepared using electrospinning method and the influence of electrospinning parameters such as PVDF concentration, DMF:Acetone ratio on the formation of different phases (α, \b{eta}, and γ) and desired morphology were investigated. A detail analysis of X-ray diffraction (XRD) and Fourier-transform infrared (FTIR) spectrometer data by deconvoluting the peaks were carried out for assigning and accurately identifying the peaks associated to a particular PVDF phase. SEM micrographs further helped in understanding the mechanism of desired \b{eta}-phase as well as in obtaining a condition for bead-free nanofibers. Interestingly, the mechanism of formation of phases are found mostly governed by the balance between surface tension and viscosity which is controlled by PVDF concentration and acetone content in the solution. A PVDF concentration of 20% (w/v) and DMF:Acetone ratio 1:1 was found suitable for maximum \b{eta}-phase in a completely bead-free nanofibers. The methodology and understanding of underlying mechanism of desired phase and morphology suggest a guideline for optimization of \b{eta}-phase and bead-free fibers in PVDF-based nanocomposite as well.
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