Hydrophilic Modification of Polypropylene Microfiltration Membrane by Radiation-Induced Graft Polymerization and Water Permeability

방사선 조사 그라프트중합에 의한 폴리프로필렌 정밀여과막의 친수화 및 물 투과특성

  • Received : 1999.08.12
  • Accepted : 1999.09.16
  • Published : 1999.10.10

Abstract

Radiation-induced grafting of 2-hydroxyethyl methacrylate(HEMA), acrylic acid(AAc) and methacrylic acid(MAAc) onto polypropylene microfiltration membrane has been studied. The effect of grafting conditions such as solvent composition(MeOH and $H_2O$) and monomer concentration on the grafting yield in investigated. The highest degree of grafting is obtained at a solvent composition of 25% $H_2O$:75% MeOH for HEMA, pure water for AAc and 50% $H_2O$:50% MeOH for MAAc. Modification of the PP membranes with hydrophilic monomers is shown to cause an increase in the water permeation flux of the membranes. It is found that HEMA is the best monomer to increase the water permeation flux and the highest water permeation flux is obtained at 99% degree of grafting. The water permeation flux of AAc-grafted PP membrane and MAAc-grafted PP membrane is very sensitive to environmental pH and $Cu^{2+}$ ion, but the water permeation flux of HEMA-grafted PP membrane scarcely depends on pH and $Cu^{2+}$ ion.

Keywords

radiation grafting;polypropylene MF membranes;hydrophilic monomer;solvent composition;water permeation flux

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