Yin Jia-Yi, Boaretti Carlo, Lorenzetti Alessandra, Martucci Alessandro, Roso Martina, Modesti Michele
Department of Industrial Engineering, University of Padova, Via Marzolo, 9, 35131 Padova, Italy.
Nanomaterials (Basel). 2022 Mar 14;12(6):962. doi: 10.3390/nano12060962.
PVDF electrospun membranes were prepared by employing different mixtures of solvents and diverse electrospinning parameters. A comprehensive investigation was carried out, including morphology, nanofiber diameter, crystallinity, β-phase fraction, and piezoelectric response under external mechanical strain. It was demonstrated that by using low-toxicity DMSO as the solvent, PVDF membranes with good morphology (bead-free, smooth surface, and uniform nanofiber) can be obtained. All the fabricated membranes showed crystallinity and β-phase fraction above 48% and 80%, respectively; therefore, electrospinning is a good method for preparing PVDF membranes with the piezoelectric properties. Moreover, we considered a potential effect of the solvent properties and the electrospinning parameters on the final piezoelectric properties. When PVDF membranes with different β-phase fractions and crystallinity values are applied to make the piezoelectric transducers, various piezoelectric voltage outputs can be obtained. This paper provides an effective and efficient strategy for regulating the piezoelectric properties of PVDF electrospun membranes by controlling both solvent dipole moment and process parameters. To the best of our knowledge, this is the first time that the influence of a solvent's dipole moment on the piezoelectric properties of electrospun materials has been reported.
通过采用不同的溶剂混合物和多种静电纺丝参数制备了聚偏氟乙烯（PVDF）静电纺丝膜。进行了全面的研究，包括形态、纳米纤维直径、结晶度、β相分数以及外部机械应变下的压电响应。结果表明，使用低毒性的二甲基亚砜（DMSO）作为溶剂，可以获得具有良好形态（无珠粒、表面光滑且纳米纤维均匀）的PVDF膜。所有制备的膜的结晶度和β相分数分别高于48%和80%；因此，静电纺丝是制备具有压电性能的PVDF膜的一种好方法。此外，我们考虑了溶剂性质和静电纺丝参数对最终压电性能的潜在影响。当应用具有不同β相分数和结晶度值的PVDF膜来制造压电换能器时，可以获得各种压电电压输出。本文通过控制溶剂偶极矩和工艺参数，为调节PVDF静电纺丝膜的压电性能提供了一种有效且高效的策略。据我们所知，这是首次报道溶剂偶极矩对静电纺丝材料压电性能的影响。
