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|Title:||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|
pH- and temperature-sensitive membrane
|Citation:||Ying, 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|
|Abstract:||Molecular 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.|
|Source Title:||Journal of Membrane Science|
|Appears in Collections:||Staff Publications|
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