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Surface zwitterionicalization of poly(vinylidene fluoride) membranes from the entrapped reactive core–shell silica nanoparticles.

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Title: Surface zwitterionicalization of poly(vinylidene fluoride) membranes from the entrapped reactive core–shell silica nanoparticles.
Authors: Zhu, Li-Jing1,2, Zhu, Li-Ping1 lpzhu@zju.edu.cn, Zhang, Pei-Bin1, Zhu, Bao-Ku1, Xu, You-Yi1
Source: Journal of Colloid & Interface Science. Apr2016, Vol. 468, p110-119. 10p.
Subjects: Surface chemistry, Zwitterions, Polyvinylidene fluoride, Artificial membranes, Silica nanoparticles
Abstract: We demonstrate the preparation and properties of poly(vinylidene fluoride) (PVDF) filtration membranes modified via surface zwitterionicalization mediated by reactive core–shell silica nanoparticles (SiO 2 NPs). The organic/inorganic hybrid SiO 2 NPs grafted with poly(methyl meth acrylate)- block -poly(2-dimethylaminoethyl methacrylate) copolymer (PMMA- b -PDMAEMA) shell were prepared by surface-initiated reversible addition fragmentation chain transfer (SI-RAFT) polymerization and then used as a membrane-making additive of PVDF membranes. The PDMAEMA exposed on membrane surface and pore walls were quaternized into zwitterionic poly(sulfobetaine methacrylate) (PSBMA) using 1,3-propane sultone (1,3-PS) as the quaternization agent. The membrane surface chemistry and morphology were analyzed by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), respectively. The hydrophilicity, permeability and antifouling ability of the investigated membranes were evaluated in detail. It was found that the PSBMA chains brought highly-hydrophilic and strong fouling resistant characteristics to PVDF membranes due to the powerful hydration of zwitterionic surface. The SiO 2 cores and PMMA chains in the hybrid NPs play a role of anchors for the linking of PSBMA chains to membrane surface. Compared to the traditional strategies for membrane hydrophilic modification, the developed method in this work combined the advantages of both blending and surface reaction. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:We demonstrate the preparation and properties of poly(vinylidene fluoride) (PVDF) filtration membranes modified via surface zwitterionicalization mediated by reactive core–shell silica nanoparticles (SiO 2 NPs). The organic/inorganic hybrid SiO 2 NPs grafted with poly(methyl meth acrylate)- block -poly(2-dimethylaminoethyl methacrylate) copolymer (PMMA- b -PDMAEMA) shell were prepared by surface-initiated reversible addition fragmentation chain transfer (SI-RAFT) polymerization and then used as a membrane-making additive of PVDF membranes. The PDMAEMA exposed on membrane surface and pore walls were quaternized into zwitterionic poly(sulfobetaine methacrylate) (PSBMA) using 1,3-propane sultone (1,3-PS) as the quaternization agent. The membrane surface chemistry and morphology were analyzed by attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), respectively. The hydrophilicity, permeability and antifouling ability of the investigated membranes were evaluated in detail. It was found that the PSBMA chains brought highly-hydrophilic and strong fouling resistant characteristics to PVDF membranes due to the powerful hydration of zwitterionic surface. The SiO 2 cores and PMMA chains in the hybrid NPs play a role of anchors for the linking of PSBMA chains to membrane surface. Compared to the traditional strategies for membrane hydrophilic modification, the developed method in this work combined the advantages of both blending and surface reaction. [ABSTRACT FROM AUTHOR]
ISSN:00219797
DOI:10.1016/j.jcis.2016.01.043