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In this paper, methylmethacrylate-acrylic acid MMA-AA hydrophilic and hydrophobic copolymerswere prepared by copolymerization for preparing membrane materials. The composite membrane of celluloseacetate (CA) blended with MMA-AA hydrophobic copolymer was used for the separation of methanol frompentane-methanol mixture. When the methanol concentration was only 1 wt% ,the permeate flux stillmaintained at 350 g/m~2h and separation factor was as big as 800. The composite membrane of PVA(polyvinyl alcohol) blended with MMA-AA hydrophilic copolymer was used for the separation of ethanol-water mixture. The permeate flux was increased to 975 g/m~2h at 74℃ and the separation factor reached 3000at 25℃. The PVA/MMA-AA blended membrane surface modified by ammonia plasma was also investigatedfor separating ethanol-water mixture. Both permeate flux and separation factor of the membrane wasimproved. However, there was no obvious difference of plasma treatment time in the interval of 20～40 min.
In this paper, methylmethacrylate-acrylic acid MMA-AA hydrophilic and hydrophobic copolymers were prepared by copolymerization for preparing membrane materials. The composite membrane of cellulose acetate (CA) blended with MMA-AA hydrophobic copolymer was used for the separation of methanol frompentane-methanol mixture. When the methanol concentration was only 1 wt%, the permeate flux stillmaintained at 350 g / m ~ 2h and the separation factor was as big as 800. The composite membrane of PVA (polyvinyl alcohol) blended with MMA-AA hydrophilic copolymer was used for the The PVA / MMA-AA blended membrane surface modified by ammonia plasma was also for domeptive ethanol- water mixture. The permeate flux was increased to 975 g / m ~ 2h at 74 ° C and the separation factor reached 3000at at 25 ° C. Both, permeate flux and separation factor of the membrane wasimproved. However, there was no obvious difference of plasma treatment time in the interval of 20 ~ 40 min.