Study on the effects and properties of PVDF/FEP blend porous membrane
作者：Wu, Yan-jie Huang, Qing-lin Xiao, Chang-fa Chen, Kai-kai Li, Xian-feng Li, Na-na
關鍵字：Polyvinylideneflouride (PVDF) Poly(tetrafluoroethylene-cohexafluoropropylene) (FEP) Membrane Non-Newtonian index Hydrophobicity
論文來源：期刊
具體來源：Desalination
發(fā)表時間：2014年
Polyvinylideneflouride (PVDF)/poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) blend flat-sheet membranes
were fabricated by the immerged phase-inversion method.Micro–nanometer scale FEP particles were introduced
into PVDF/N,N-dimethylacetamide (DMAc) casting solution. Effects of FEP content on the rheology
behavior of casting solution and performances of PVDF/FEP blend membranes were investigated respectively.
Results shown that: (1) With FEP content increasing, the viscosity of casting solution decreased while the
value of non-Newtonian index n increased. When FEP content was 60 wt.%, the value of n reached as high as
0.903 which demonstrated that the casting solution exhibited good Newtonian flowing property; (2) with FEP
content increasing, the porosity and permeability of blend membranes increased obviously while the liquid entrance
pressure (LEP) decreased. Blend membranes'' cross-section morphologies shown that the increase in FEP
content aided the formation of a larger and deeper finger-like pore structure; and (3) with FEP content increasing,
mechanical strength of blend membranes decreased while the water contact angle increased at first then
decreased.