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Development of Novel ECTFE Coated PP Composite Hollow-Fiber Membranes

Institute on Membrane Technology-National Research Council (ITM-CNR), Via P. Bucci, cubo 17C, 87036 Rende CS, Italy
Author to whom correspondence should be addressed.
Academic Editor: Mahbubul Hassan
Coatings 2016, 6(3), 40;
Received: 10 July 2016 / Revised: 2 September 2016 / Accepted: 8 September 2016 / Published: 19 September 2016
(This article belongs to the Special Issue Fabric Coatings)
PDF [8326 KB, uploaded 19 September 2016]


In this work composite hollow-fibers were prepared by dip-coating of commercial polypropylene (PP) with a thin layer of ethylene–chlorotrifluoroethylene copolymer (ECTFE). The employment of N-methyl pyrrolidone (NMP) as solvent improved the polymer processability favoring dip-coating at lower temperature (135 °C). Scanning electron microscopy (SEM) analyses showed that after dip-coating the PP support maintained its microstructure, whereas a thin coated layer of ECTFE on the external surface of the PP hollow-fiber was clearly distinguishable. Membrane characterization evidenced the effects of the concentration of ECTFE in the dope-solution and the time of dip-coating on the thickness of ECTFE layer and membrane properties (i.e., contact angle and pore size). ECTFE coating decreased the surface roughness reducing, as a consequence, the hydrophobicity of the membrane. Moreover, increasing the ECTFE concentration and dip-coating time enabled the preparation of a thicker layer of ECTFE with low and narrow pore size that negatively affected the water transport. On the basis of the superior chemical resistance of ECTFE, ECTFE/PP composite hollow fibers could be considered as very promising candidates to be employed in membrane processes involving harsh conditions. View Full-Text
Keywords: composite membranes; hollow-fibers; dip-coating; ethylene-chlorotrifluoroethlyene; thermal induced phase separation technique (TIPS) composite membranes; hollow-fibers; dip-coating; ethylene-chlorotrifluoroethlyene; thermal induced phase separation technique (TIPS)

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Santoro, S.; Drioli, E.; Figoli, A. Development of Novel ECTFE Coated PP Composite Hollow-Fiber Membranes. Coatings 2016, 6, 40.

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