The oxygen and carbon dioxide concentration in water affect living organism such as plankton, shellfish and fish.  In such applications, dissolved oxygen and carbon dioxide permeability under water is very important material property and degassed membrane having water-exclusion performance and high gas permeability is required to control concentration in water.  In culture industry, packaging material, and industrial waste, mixture including pure water, gas, and some oily organic compounds is used. Some oils in water cause the membrane fouling which decrease dissolved gas permeability and greatly influence the membrane life.  Therefore, the degassed membrane required the anti-fouling property.  Poly(1-trimethylsilyl-1-propyne) (PTMSP) available to degassed membrane due to water-exclusion performance and high gas permeability as the polymer membrane was selected.  High-volatile toluene having high ration of component in oil and small interaction dipole moments as the third component was selected.  Vacuum ultraviolet (VUV) irradiation that is one of the methods of surface modification is expected to improving the anti-fouling property because of smaller interaction with oily organic compound by improving hydrophilicity of the membrane surface.  Dissolved gas permeability measurement was measured for oxygen and carbon dioxide using a electrode method at 25, 30, 35, and 40 �C.  In this study, the oxygen and carbon dioxide permeability change dissolved in toluene solution through VUV-irradiated PTMSP membrane were systematically investigated.  Dissolved gas permeability in toluene solution decreased on all of the VUV irradiation membrane.  Improvement of dissolved gas permeability by modification was not observed.  However, toluene permeability decreased as VUV irradiation time increased.  Based on ATR-FTIR spectra, C=O and Si�O�Si peaks of the membrane surface decreased after gas permeation measurement in toluene solution.  Therefore, toluene permeability depended on the surface layer formed by VUV irradiation.

Effect of fouling on hydrophilic surface poly(1-trimethylsilyl-1-propyne) membrane

248th National Meeting (2014)

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