Surface Grafting of Polysulfone Membrane Using Supercritical Carbon Dioxide
Date Issued
2007
Date
2007
Author(s)
Chen, Tsung-Chin
DOI
zh-TW
Abstract
Polysulfone (PSf) is a widely used material in membrane for hemodialysis. However, the hydrophobic nature of PSf limit its application in hemodialysis. Graft acrylic acid (AAc) and 2-Hydroxyethyl methacrylate (HEMA) monomer onto PSf membrane by free-radical polymerization using supercritical carbon dioxide (SCCO2) as a solvent and swelling agent. The PSf membrane was first impregnated with the monomer and initiator AIBN with SCCO2, and the monomer molecules were grafted onto the PSf membrane at a higher temperature. By this method, the grafting level can be controlled by temperature, pressure, reaction time, and concentration of reaction agents. When temperature is 80℃, pressure is 17.5 MPa, the concentration of HEMA and AIBN are 0.12M and 0.04M. At reaction time 5h, the grafting percentage of PSf-g-HEMA is 36.0 wt%. Further, at the optimal condition of grafting AAc, the grafting percentage is 20.4 wt%.
The modified surfaces were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), contact angle and X-ray induced photoelectron spectroscop (XPS). The hydrophilicity of the membranes is increased after grafting. The contact angle of modified PSf membranes are reduced from 88.6o ± 1.1 to 43.0o ± 2.4 (n=10).
Subjects
聚碸
超臨界二氧化碳
自由基接枝聚合
丙烯酸
甲基丙烯酸羥乙酯
polysulfone
acrylic acid
HEMA
grafting
SCCO2
Type
thesis
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