Development of a coating technique for the internal structure of polypropylene microfiltration membranes |
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| Institution: | 1. Department of Chemical Engineering, McMaster UniversityHamilton, Ont. L8S 4L7Canada;2. Department of Chemistry, McMaster UniversityHamilton, Ont. L8S 4M1Canada;3. Corporate Research, Technology Development Laboratory, 3M CompanySt. Paul, MN 55144-1000USA;1. Department of Chemical Engineering, Tabriz Branch, Islamic Azad University, P.O. Box 1655, Tabriz, IR, Iran;2. Nanostructure Material Research Center (NMRC), Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran;3. Faculty of chemical engineering of Chemical Engineering, Sahand University of Technology, P.O. Box 51335/1996, Tabriz, Iran;1. Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, USA;2. National Research Center on Membrane Technologies (MEM-TEK), Istanbul Technical University, Maslak, Istanbul 34469, Turkey;3. Nanoscience and Nanoengineering Department, Graduate School of Science, Engineering and Technology, Istanbul Technical University, Maslak, Istanbul 34469, Turkey;4. Environmental Engineering Department, Faculty of Civil Engineering, Istanbul Technical University, Maslak, Istanbul 34469, Turkey;1. Water, Energy and Environmental Engineering, P.O. Box 4300, FIN-90014, University of Oulu, Oulu, Finland;2. Chemical Process Engineering, P.O. Box 4300, FIN-90014, University of Oulu, Oulu, Finland |
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| Abstract: | A novel method of coating hydrophobic polyolefinic microfiltration (MF) membranes to produce a more hydrophilic membrane has been developed. A modified interfacial polymerization technique was used to coat the internal surface of a polypropylene (PP) membrane (about: 1.1 μm pore size, 84% void volume, 84 μm thick). 1,8-octanediamine (selected from several possible diamines) is dried onto the membrane internal surface from methanol and then reacted with a disulfonyl chloride (plus trisulfonyl chloride crosslinking agent) from a mixed solvent system of CHCl3 and CCl4, forming a polysulfonamide coating. Key polymerization parameters were identified as time and temperature of polymerization, concentrations of the diamine and the sulfonyl chlorides, and the ratio of CHCl3 to CCl4. The coating was uniform and stable. Permeation measurements were performed with various size polystyrene latex spheres and carboxylic modified polystyrene latex spheres in aqueous solution. Coating significantly increased hydrophillicity, and hence flux, and reduced membrane fouling for latex sphere solutions. |
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