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    Ultrafiltration membranes based on hybrids of an amphiphilic graft copolymer and titanium isopropoxide

    Year: 2018

    Journal: J. Appl. Polym. Sci., Volume 135, nov-20

    Authors: Park, Min Su; Park, Byeong Ju; Kim, Na Un; Park, Jung Tae; Kim, Jong Hak

    Organizations: National Research Foundation (NRF) - Ministry of Science, ICT and Future Planning [NRF-2017R1A4A1014569, NRF-2017R1D1A1B06028030]

    Keywords: copolymers; grafting; membranes; separation techniques

    Graft copolymer poly(vinyl chloride)-g-poly(oxyethylene methacrylate) (PVC-g-POEM) is combined with titanium isopropoxide (TTIP) to form hybrids that undergo phase separation in a water bath. The water permeance of the PVC-g-POEM membrane increases by hybridization with TTIP owing to an increase in the surface pore size and porosity. Upon heating to 80 degrees C, the water permeances of PVC-g-POEM and PVC-g-POEM/TTIP decrease owing to the increased thickness of the top layer. However, the bovine serum albumin (BSA) rejection of PVC-g-POEM increases, while that of PVC-g-POEM/TTIP decreases. This is attributed to accelerated dissolution of TTIP at 80 degrees C, resulting in a large number of surface pores. The antifouling performance is significantly improved by TTIP addition and heating owing to increased hydrophilicity, as confirmed by contact angle, O/C atomic ratio, and water content measurements. The PVC-g-POEM/TTIP membrane prepared at 25 degrees C shows the best performance [338 Lm(-2)h(-1)bar(-1) (LMH) water permeance, 89.4% BSA rejection, and 91.9% flux ratio recovery]. (c) 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45932.
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