Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.memsci.2003.07.002
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dc.titleCharacterization of membranes prepared from blends of poly(acrylic acid)-graft-poly(vinylidene fluoride) with poly(N-isopropylacrylamide) and their temperature- and pH-sensitive microfiltration
dc.contributor.authorYing, L.
dc.contributor.authorKang, E.T.
dc.contributor.authorNeoh, K.G.
dc.date.accessioned2014-06-17T08:30:55Z
dc.date.available2014-06-17T08:30:55Z
dc.date.issued2003-10-15
dc.identifier.citationYing, L., Kang, E.T., Neoh, K.G. (2003-10-15). Characterization of membranes prepared from blends of poly(acrylic acid)-graft-poly(vinylidene fluoride) with poly(N-isopropylacrylamide) and their temperature- and pH-sensitive microfiltration. Journal of Membrane Science 224 (1-2) : 93-106. ScholarBank@NUS Repository. https://doi.org/10.1016/j.memsci.2003.07.002
dc.identifier.issn03767388
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/66485
dc.description.abstractMolecular modification of ozone-pretreated poly(vinylidene fluoride) (PVDF) via thermally-induced graft copolymerization with acrylic acid (AAc) in N-methyl-2-pyrrolidone (NMP) solution was carried out (the graft-copolymerized PVDF (PAAc-g-PVDF) copolymer). pH- and temperature-sensitive microfiltration (MF) membranes from blends of the PAAc-g-PVDF copolymer and poly(N-isopropylacrylamide) (PNIPAAM) in NMP solution were prepared by phase inversion in water at 25°C. The bulk and surface compositions of the membranes were obtained by elemental analysis and X-ray photoelectron spectroscopy (XPS), respectively. XPS analyses of the blend membranes revealed a substantial surface enrichment of the grafted AAc polymer and blended PNIPAAM. The thermal stability of the PAAc-g-PVDF/PNIPAAM blend membranes was investigated by thermogravimetric (TG) analysis. The miscibility of the PAAc-g-PVDF/PNIPAAM blend membranes was studied by differential scanning calorimetry (DSC) analysis. The polycrystallinity of the blend membranes was evaluated by X-ray diffraction (XRD) analysis. The pore sizes of the blend membranes were measured using a Coulter® Porometer II apparatus. The morphology of the membranes was studied by scanning electron microscopy (SEM). The copolymer blend membranes exhibited both pH-dependent and temperature-sensitive permeability to the aqueous solutions, with the most drastic change in permeability being observed at permeate pH between 2 and 4 and temperature around 32°C. © 2003 Elsevier B.V. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.memsci.2003.07.002
dc.sourceScopus
dc.subjectBlend
dc.subjectGraft
dc.subjectpH- and temperature-sensitive membrane
dc.subjectPoly(N-isopropylacrylamide)
dc.subjectPoly(vinylidene fluoride)
dc.typeArticle
dc.contributor.departmentCHEMICAL & ENVIRONMENTAL ENGINEERING
dc.description.doi10.1016/j.memsci.2003.07.002
dc.description.sourcetitleJournal of Membrane Science
dc.description.volume224
dc.description.issue1-2
dc.description.page93-106
dc.description.codenJMESD
dc.identifier.isiut000186283600008
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