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Surface Self-Assembled PEGylation of Fluoro-Based PVDF Membranes via Hydrophobic-Driven Copolymer Anchoring for Ultra-Stable Biofouling Resistance
journal contribution
posted on 2016-02-19, 01:23 authored by Nien-Jung Lin, Hui-Shan Yang, Yung Chang, Kuo-Lun Tung, Wei-Hao Chen, Hui-Wen Cheng, Sheng-Wen Hsiao, Pierre Aimar, Kazuo Yamamoto, Juin-Yih LaiStable
biofouling resistance is significant for general filtration
requirements, especially for
the improvement of membrane lifetime. A systematic group of hyper-brush
PEGylated diblock copolymers containing poly(ethylene glycol) methacrylate
(PEGMA) and polystyrene (PS) was synthesized using an atom transfer
radical polymerization (ATRP) method and varying PEGMA lengths. This
study demonstrates the antibiofouling membrane surfaces by self-assembled
anchoring PEGylated diblock copolymers of PS-b-PEGMA
on the microporous poly(vinylidene fluoride) (PVDF) membrane. Two
types of copolymers are used to modify the PVDF surface, one with
different PS/PEGMA molar ratios in a range from 0.3 to 2.7 but the
same PS molecular weights (MWs, ∼5.7 kDa), the other with different
copolymer MWs (∼11.4, 19.9, and 34.1 kDa) but the similar PS/PEGMA
ratio (∼1.7 ± 0.2). It was found that the adsorption capacities
of diblock copolymers on PVDF membranes decreased as molar mass ratios
of PS/PEGMA ratio reduced or molecular weights of PS-b-PEGMA increased because of steric hindrance. The increase in styrene
content in copolymer enhanced the stability of polymer anchoring on
the membrane, and the increase in PEGMA content enhanced the protein
resistance of membranes. The optimum PS/PEGMA ratio was found to be
in the range between 1.5 and 2.0 with copolymer MWs above 20.0 kDa
for the ultrastable resistance of protein adsorption on the PEGylated
PVDF membranes. The PVDF membrane coated with such a diblock copolymer
owned excellent biofouling resistance to proteins of BSA and lysozyme
as well as bacterium of Escherichia coli and Staphylococcus epidermidis and high stable microfiltration
operated with domestic wastewater solution in a membrane bioreactor.
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antibiofouling membrane surfacesadsorption capacitiesmolar mass ratios34.1 kDa20.0 kDamembrane bioreactorPScopolymer MWsultrastable resistancestyrene contentprotein adsorptionPVDF surfacebiofouling resistancediblock copolymersmembrane lifetimeBSAATRPStaphylococcus epidermidisPEGylated diblock copolymersEscherichia colidiblock copolymerprotein resistanceatom transferfiltration requirementsPEGMA contentsteric hindrancePVDF membranesPEGylated PVDF membranesPVDF membranePEGMA lengthswastewater solution
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