3. Results and discussion
3.1. FTIR analysis
Fig. 1 shows the Fourier transfer infrared (FTIR) analysis of synthesized
polyurethane PU1, PU2, Zeolite ZSM-5 and PU2-based
polyurethane–zeolite hybrid membranes. The disappearance of
absorption peak for the NCO group in 2270 cm1 indicates the
completion of the diisocyanate group’s reaction at polymer. The
peak of ether groups occurs at 1024 cm1. Moreover, the N–H
group of the urethane unit is absorbed at 3319 cm1.