Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (6): 2065.doi: 10.7503/cjcu20200627

• Polymer Chemistry • Previous Articles     Next Articles

Preparation of PVDF Hollow Fiber Membranes via Melt Spinning-stretching Method and Its Oil-water Separation Performance

GAO Yifei1, XIAO Changfa2(), JI Dawei3, HUANG Yangzheng1   

  1. 1.School of Material Science and Engineering
    2.State Key Laboratory of Separation Membranes and Membrane Processes
    3.School of Textile Science and Engineering,Tiangong University,Tianjin 300387,China
  • Received:2020-08-28 Online:2021-06-10 Published:2021-06-08
  • Contact: XIAO Changfa E-mail:xiaochangfa@163.com
  • Supported by:
    the National Natural Science Foundation of China(51673149)

Abstract:

Nowadays, green chemistry is attracting more and more attention. In this paper, polyvinylidene fluoride(PVDF) hollow fiber membranes were prepared by environment-friendly melt spinning-stretching method without any solvent and diluent involved in membrane preparation process. In particular, we selected perfluoroethylene propylene(FEP) as the dispersed phase and water-soluble polyethylene glycol(PEG) and calcium chloride(CaCl2) as the pore-forming agents. The influences of stretching ratio on the structure and properties of PVDF hollow fiber membranes were studied in detail based on pore size distribution, mechanical properties and water-in-oil emulsion separation performance. The results show that the dispersed phase and pore-forming agents can be uniformly dispersed in the matrix phase, and the the pore size distributions are relatively narrow. With the increase of the stretching ratio, the mean pore sizes and porosities of the membranes also increase. Meanwhile, the hydrophobility of the membranes decreases, but the water contact angles are all above 100°. The M-3 membrane shows a good mechanical property and separation effect for water-in-oil emulsion, of which the tensile strength can be up to 19.3 MPa and the separation effects are all higher than 97% at 0.02 MPa after five cycles. The results demonstrate that the membrane is potentially applicable in oil-water separation process.

Key words: Polyvinylidene fluoride(PVDF), Melt spinning-stretching method, Hollow fiber membrane, Oil-water separation

CLC Number: 

TrendMD: