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|Title:||Multi-functionalization of poly(vinylidene fluoride) membranes via combined "grafting from" and "grafting to" approaches|
|Citation:||Cai, T., Wang, R., Yang, W.J., Lu, S., Neoh, K.-G., Kang, E.-T. (2011-11-07). Multi-functionalization of poly(vinylidene fluoride) membranes via combined "grafting from" and "grafting to" approaches. Soft Matter 7 (23) : 11133-11143. ScholarBank@NUS Repository. https://doi.org/10.1039/c1sm06039b|
|Abstract:||PVDF-g-[PBIEM-co-PPMA] graft copolymers were first synthesized in a "grafting from" process, involving thermally induced graft copolymerization of two inimers, 2-(2-bromoisobutyryloxy)ethyl methacrylate (BIEM) and propargyl methacrylate (PMA), from ozone-preactivated poly(vinylidene fluoride) (PVDF) chains. Microporous membranes were fabricated from the PVDF-g-[PBIEM-co-PPMA] copolymers by phase inversion in an aqueous medium. The tertiary C-Br groups of BIEM repeat units and the propargyl groups of PMA repeat units on the PVDF-g-[PBIEM-co-PPMA] membrane and pore surfaces provided the respective functionalities for the "grafting from" process involving surface-initiated atom transfer radical polymerization (ATRP) of the viologen-containing monomer, N-benzyl-N′-(4-vinylbenzyl)-4,4′- bipyridium dichloride (BVbpy), and the "grafting to" process involving alkyne-azide click reaction with azido-terminated poly(N-isopropylacrylamide) (PNIPAM-N 3), prepared a priori via reversible addition-fragmentation chain transfer (RAFT) polymerization. The resulting PVDF-g-[P(BIEM-g-PBVbpy)-co- P(PMA-click-PNIPAM)] membrane exhibited both redox- and temperature-dependent permeability to aqueous solutions. Alternatively, metal ions, such as Ag, Au or Pt ions, can be immobilized and reduced within the viologen-containing PBVbpy brushes on the PVDF-g-[P(BIEM-g-PBVbpy)-co-PPMA] membrane. The functionalized PVDF-g-[P(BIEM-g-PBVbpy)-co-PPMA]-Ag membrane surfaces were shown to be effective in reducing bacterial adhesion and fouling under continuous-flow conditions. © The Royal Society of Chemistry 2011.|
|Source Title:||Soft Matter|
|Appears in Collections:||Staff Publications|
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