Y Mansourpanah - Membrane Research Center, Department of Chemical Engineering,Razi University, Kermanshah, Iran
S. S. Madaeni - Membrane Research Center, Department of Chemical Engineering,Razi University, Kermanshah, Iran
A Rahimpour - Membrane Research Center, Department of Chemical Engineering,Razi University, Kermanshah, Iran

Polyethersulfone/ polyimide (PES/PI) were dissolved in DMF/DO (50/50 wt.%) using 2 wt.% polyvinylpirrolidone as pore former. The membrane modification was started by addition ethylenediamine (EDA) in methanol for opening the imide group ring of PI. PEG-triazine was produced in our laboratory and employed as a communication bridge for connection of membrane to diethanolamine (DA) as a hydrophilic modifier. PEG-triazine can remove chlorine atoms with hydrogen of amine groups and forms a -C-N- bound at different temperatures. For characterization of modified membranes SEM, AFM, FTIR-ATR and contact angle tests were employed. The obtained results indicate a successful modification of PES/PI membrane. The rejection was improved form 75 to 93%.

Nanofiltration, modification, blend membrane preparation