The effect of a N,N-dimethylformamide (DMF)/acetone solvent system (3:7, 4:6, 5:5, 6:4, 7:3) and spinning medium (air and water) on the membrane morphology and the structure-property relationship were investigated. A facile method was optimized to generate a porous, polymer-fiber membrane via the combinative effect of electrospinning and thermally inducing phase separation of the DMF/acetone (4:6) solvent system in a water medium. The attenuated total reflection (ATR) - Fourier transform infrared (FTIR) results showed an increased β-phase compared to the pristine poly(vinylidene fluoride) (PVDF). The XRD and DSC results further confirmed that the co-existing α- and β-phases in the pristine PVDF were converted into a unique β-phase in the electrospun membranes. In addition, the solvent uptake percentage of the DMF/acetone (4:6) solvent system in a water medium (540) is much greater than that in an air medium (320), and over two times better than that of commercial polyethylene (PE) membranes (190). Similarly, the discharge capacity of the PVDF membrane separator prepared with the DMF/acetone (4:6) solvent system in a water medium is higher than that of the air medium. This enhancement of solvent uptake might be due to the interconnected porous morphology present in the water medium.

N，N-二甲基甲酰胺（DMF）/丙酮溶剂系统（3：7、4：6、5：5、6：4、7：3）和纺丝介质（空气和水）对膜形态和结构的影响研究了结构-性质关系。通过在水介质中电纺丝和热诱导DMF /丙酮（4：6）溶剂系统相分离的组合作用，优化了一种简便的方法来生成多孔的聚合物纤维膜。与原始聚偏二氟乙烯（PVDF）相比，衰减全反射（ATR）-傅立叶变换红外（FTIR）结果显示β相增加。XRD和DSC结果进一步证实，原始PVDF中同时存在的α和β相在电纺膜中转化为独特的β相。此外，DMF /丙酮的溶剂吸收百分比（4：6）水介质（540）中的溶剂系统比空气介质（320）中的溶剂系统大得多，并且比市售聚乙烯（PE）膜（190）的溶剂系统好两倍以上。同样，用DMF /丙酮（4：6）溶剂系统制备的PVDF膜分离器在水介质中的放电容量要比空气介质中的放电容量高。溶剂吸收的增加可能是由于水介质中存在相互连接的多孔形态。