GRAFTING POLY(N-ISOPROPYL ACRYLAMIDE) FROM POLY(VINYLIDENE FLUORIDE) MIROFILTRATION, MEMBRANES VIA DIRECT SURFACE-INITIATED, ATOM TRANSFER RADICAL POLYMERIZATION, AND TEMPERATURE SENSITIVITY

Yiwang Chen (), Jichun Xiao, Weihua Zhou, Qilan Deng, Huarong Nie, Meixiang Wan and Fenglian Bai
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Yiwang Chen: Institute of Polymer, Nanchang University, Nanchang 330031, China
Jichun Xiao: Institute of Polymer, Nanchang University, Nanchang 330031, China
Weihua Zhou: Institute of Polymer, Nanchang University, Nanchang 330031, China
Qilan Deng: Institute of Polymer, Nanchang University, Nanchang 330031, China
Huarong Nie: Institute of Polymer, Nanchang University, Nanchang 330031, China
Meixiang Wan: Key Laboratory of Organic Solids, Centre for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
Fenglian Bai: Key Laboratory of Organic Solids, Centre for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China

Surface Review and Letters (SRL), 2009, vol. 16, issue 01, 111-121

Abstract: Well-defined poly(N-isopropyl acrylamide) (PNIPAAm) brushes on commercial hydrophobic poly(vinylidene fluoride) (PVDF) microfiltration membrane surfaces were prepared, via direct atom transfer radical polymerization (ATRP) with the secondary fluorinated site of PVDF as initiator and water as solvent at 80°C. The effect of solvents on the ATRP was studied in detail. The water as reaction solvent was in favor of surface-initiated ATRP ofN-isopropyl acrylamide (NIPAAm) from secondary fluoride of PVDF membranes. The chemical composition and structure of the modified PVDF membrane surfaces were determined by attenuated total reflectance (ATR) Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The surface and cross-section morphology of membranes were studied by scanning electron microscopy (SEM). The pore sizes of the pristine PVDF membrane and the PNIPAAm-grafted PVDF membranes were measured using micro-image analysis and process software. The introduction of the well-defined PNIPAAm on the PVDF membrane gave rise to hydrophilicity. Water contact angles of PVDF membranes reduced after the surface grafting of PNIPAAm. Water fluxes and protein solution permeation experiments revealed that the PNIPAAm-grafted PVDF membranes exhibited temperature-responsive permeability. The unique microstructure of PNIPAAm brushes facilitated hydrophilicity below the lower critical solution temperature.

Keywords: Poly(vinylidene fluoride); membrane; ATRP; temperature sensitivity (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X09012378

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