On the Structure of Porous Poly(vinylidene fluoride) Membrane Prepared by Phase Inversion from Water-NMP-PVDF System

Dar-Jong Lin; Cheng-Liang Chang; Tzung-Chin Chen; Liao-Ping Cheng

doi:10.6180/jase.2002.5.2.04

On the Structure of Porous Poly(vinylidene fluoride) Membrane Prepared by Phase Inversion from Water-NMP-PVDF System

Chemical Engineering

Dar-Jong Lin¹, Cheng-Liang Chang¹, Tzung-Chin Chen¹ and Liao-Ping Cheng ¹

¹Department of Chemical Engineering Tamkang University Tamsui, Taipei, Taiwan 251, R.O.C.

Received: April 8, 2002
Accepted: May 13, 2002
Publication Date: June 1, 2002

Download Citation: ||https://doi.org/10.6180/jase.2002.5.2.04

ABSTRACT

A PVDF membrane was prepared by isothermal immersion precipitation of a PVDF/NMP solution from pure water bath. FESEM imaging of the formed membrane revealed its porous structure, featuring tight skin, macrovoids, and cellular pores. These structural characteristics were common to membranes that were formed by precipitation of amorphous polymers from harsh nonsolvents. Evidence of crystallization in the present PVDF membrane could be observed on the surfaces of the various pores in the form of branching dendrites.

Keywords: Membrane, Poly(vinylidene fluoride), Phase Separation, Porous

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