Enhancement of solvent uptake in porous PVDF nanofibers derived by a water-mediated electrospinning technique  

作　　者：Gajula Prasad Jun-Wei Liang Wei Zhao Yingbang Yao Tao Tao Bo Liang Sheng-Guo Lu 

机构地区：[1]Guangdong Provincial Research Center on Smart Materials and Energy Conversion Devices,Guangzhou,510006,China [2]Guangdong Provincial Key Laboratory on the Functional Soft Condensed Matter,Guangzhou,510006,China [3]School of Materials and Energy,Guangdong University of Technology,Guangzhou,510006,China [4]Dongguan South China Design Innovation Institute,Building D-1,University Innovation City Area,Songshan Lake,Dongguan,523808,China

出　　处：《Journal of Materiomics》2021年第2期244-253,共10页无机材料学学报（英文）

基　　金：supported by the Natural Science Foundation of China(Grant No.51372042,51872053);Guangdong Provincial Natural Science Foundation(2015A030308004);the NSFCGuangdong Joint Fund(Grant No.U1501246).

摘　　要：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 b-phase compared to the pristine poly(vinylidene fluoride)(PVDF).The XRD and DSC results further confirmed that the co-existing a-and b-phases in the pristine PVDF were converted into a unique b-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.

关 键 词：Polyvinylidene fluoride ELECTROSPINNING Thermally induced phase separation VISCOSITY Porous fibers Discharge capacity Solvent uptake 

分 类 号：O62[理学—有机化学]