플라즈마 처리된 폴리스티렌 막을 통한 순수한 CO2와 N2기체의 선택,투과 특성

Abstract

surface of polystyrene membrane treated by Ar, O2 plasma, and the effects were observed before andafter the treatment and permeability of CO2, N2 and selectivity of CO2 relative to N2 was measured using continuousflow gas permeation analyzer (GPA). The mole ratio of O over C in the surface was increased from 0 to 0.179 with Arplasma treatment and route mean square of surface was increased from 15.86 to 71.64 . Therefore the contact anglewas decreased from 89.16o to 18.1o membrane tend to be highly hydrophilic.The optimum condition for the CO2 permeability and ideal selectivity of the plasma treated membrane was as folows:the measurement of Ar (60 W, 2 min, 70oC) plasma treatment was 1.14×10-12[m3(STP).m/m2.sec.atm] and 4.22. In thecase of O2 plasma treatment, the contact angle was decreased at 13.56° with increase of O/C ratio (0.189 ) and routemean square of surface (57.10 ). The optimum condition for the CO2 permeability and ideal selectivity of the plasmatreated membrane was as follows: the measurement of O2 (90 W, 2min, 70oC) plasma treatment was 7.1×10-12[m3 .m/m2 .sec.atm] and 11.5. After plasma treatment, the changes of membrane surface were all subtly linked with both cros-linking andetching effects. Finally, it was confirmed that the gas permeation capacity and selectivity of the modified membrane withplasma could be improved by an appropriate control of the plasma conditions such as treatment time, the power inputand sort of plasma gas.