Surface Modification of Polyacrylonitrile Membrane Using Supercritical Carbon Dioxide
Date Issued
2006
Date
2006
Author(s)
Iun, Chan-Pong
DOI
en-US
Abstract
Supercritical carbon dioxide (SCCO2) was used as the solvent and swelling agent to modify the surface of polyacrylonitrile (PAN) membrane. A two-stage process was used to graft 2-hydroxyethyl methacrylate (HEMA) by free radical polymerization onto PAN. The composite polymer was prepared by first infusion of initiator, 2,2’-azobisisobutyronitrile (AIBN) into the swollen substrate by SCCO2. The next step involved the grafting of HEMA by absorbed AIBN on the surface of PAN, making the surface to be coated with hydrophilic domains of HEMA. Using SCCO2 as the solvent has the advantage to control the effectiveness of grafting by variation in operating temperature and pressure. In stead of using two-stage process, one stage process could also be used. The procedures of preparation were varied to compare the effectiveness of grafting by each procedure. The chemical changes of PAN were characterized by Fourier transfer infrared (FTIR) spectroscopy. The hydrophilicity and hydrophobicity of membrane surface was characterized by static contact angle measurement using sessile drop method. The changes in melting and crystalline behavior of the polymer were characterized by differential scanning calorimetry (DSC). The change in surface morphology was characterized by scanning electron microscope (SEM). In order to test whether this method could be applied for the modification of other polymers, this method was used further to prepare polymer blend of polytetrafluoroethylene–poly(2-hydroxyethyl methacrylate), and the grafting of HEMA onto other polymers like poly(vinyl fluoride) and polycarbonate.
Subjects
超臨界二氧化碳
聚丙烯腈
表面改質
supercritical carbon dioxide
polyacrylonitrile
surface modification
Type
thesis
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