POLYURETHANE MEMBRANE PROPERTIES BASED ON TREATMENT AND ITS COMPOSITION

Protected process by acetylation on hydroxy groups affected free fatty acid properties as a monomer in polyurethane (PU) membrane synthesized. Synthesis process reached the optimum composition at OH : TDI 1.2 : 0.41 (mole/mole) for unprotected membranes and 1.2 : 0.52 (mole/mole) for protected membranes. Optimum performance in reverse osmosis aplication was reached at pressure 20 atm, indicating by flux of 29.61 L/m2 h and rejection factor of 44,3 %. The result obtained was a transparent, elastic and strong film, with characteristics were polymerization completely occurred, i.e. hydrogen bonding index (HBI) of 0.43; glass transition temperature of 127.02 oC; decomposition temperature of 401.55 oC; crystallinity of 60.34 %; tensile strength of 328.45 Mpa, strain of 2.29 %, bursting strength of 767 Kpa, homogenouseous and smooth morphology before and after reverse osmosis application.