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/m2h 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 975g/m2h at 74℃ and the separation factor reached 3000 at 25℃.The PVA/MMA-AA blended membrane surface modified by ammonia plasma was also investigated for separating ethanol-water mixture.Both permeate flux and separation factor of the membrane was improved.However

there was on obvious difference of plasma treatment time in the interval of 20～40 min.