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Highly hydrophobic microporous low‐density polyethylene hollow fiber membranes by melt‐extrusion coupled with salt‐leaching technique
Author(s) -
MosadeghSedghi Sanaz,
Rodrigue Denis,
Brisson Josée,
Iliuta Maria C.
Publication year - 2013
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.3122
Subject(s) - materials science , microporous material , low density polyethylene , membrane , extrusion , porosity , scanning electron microscope , leaching (pedology) , composite material , polyethylene , chemical engineering , fiber , surface roughness , contact angle , chemistry , biochemistry , environmental science , soil science , engineering , soil water
Microporous and highly hydrophobic low‐density polyethylene (LDPE) hollow fiber membranes were successfully prepared via a solvent‐free method, combining melt‐extrusion, and salt‐leaching techniques. NaCl particles with particle size of 5–10 µm were mixed with LDPE pellets to produce a blend of 35, 40, 50, 60, 65 and 68 wt% of salt. A microporous structure was produced by leaching the salt particles from the hollow fiber matrix via immersion in water at 60°C. The fabricated membranes were then characterized in terms of morphology, porosity and pore size distribution, surface roughness, and hydrophobicity, as well as mechanical properties. The remarkable increase in the water contact angles from 98° for LDPE hollow fibers fabricated without the addition of salt (blank sample) to 130° for membranes fabricated with initial salt content of 68 wt% is mainly attributed to the rough surface structure, comprising a large number of micropapillas produced by removing the imbedded salt crystals. The increase in surface roughness and porosity of hollow fiber membranes with increasing initial salt content was confirmed by scanning electron microscope and atomic force microscopy. Copyright © 2013 John Wiley & Sons, Ltd.