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Open AccessArticle

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
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Academic Editor: Mahbubul Hassan
Coatings 2016, 6(3), 40; https://doi.org/10.3390/coatings6030040
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)
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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MDPI and ACS Style

Santoro, S.; Drioli, E.; Figoli, A. Development of Novel ECTFE Coated PP Composite Hollow-Fiber Membranes. Coatings 2016, 6, 40. https://doi.org/10.3390/coatings6030040

AMA Style

Santoro S, Drioli E, Figoli A. Development of Novel ECTFE Coated PP Composite Hollow-Fiber Membranes. Coatings. 2016; 6(3):40. https://doi.org/10.3390/coatings6030040

Chicago/Turabian Style

Santoro, Sergio; Drioli, Enrico; Figoli, Alberto. 2016. "Development of Novel ECTFE Coated PP Composite Hollow-Fiber Membranes" Coatings 6, no. 3: 40. https://doi.org/10.3390/coatings6030040

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