Fabrication of microporous polymeric membranes by melt processing of immiscible blends

Document Type

Article

Publication Date

1-1-2003

Abstract

Microporous flat film membranes from immiscible polypropylene (PP)/polystyrene (PS) blends with and without a compatibilizing copolymer were produced via melt processing and post-extrusion drawing. The blends were first compounded in a corotating twin-screw extruder and subsequently extruded through a sheet die to obtain the precursor films. These were uniaxially drawn (100-500%) with respect to the original dimensions to induce a microporous structure and then post-treated at elevated temperatures to stabilize the porous structure, which consisted of uniform microcracks in the order of a few nanometers in width. The effects of composition and process parameters on porosity and solvent (methanol) permeability of the prepared membranes are presented. Comparison of the data with those of commercial membranes prepared by phase-inversion processes suggests significant differences in pore size distribution as well as overall surface porosity. © 2002 Elsevier Science B.V. All rights reserved.

Identifier

0037212532 (Scopus)

Publication Title

Journal of Membrane Science

External Full Text Location

https://doi.org/10.1016/S0376-7388(02)00032-7

ISSN

03767388

First Page

167

Last Page

175

Issue

1

Volume

211

Fund Ref

State of New Jersey Commission on Science and Technology

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