Novel polySchiff base containing naphthyl: synthesis,characterization, optical properties and surface morphology

In the present work, a Schiff base was obtained from reaction of 1-naphthylamine with salicylaldehyde and its polymer (poly(NIMP)) was synthesized via oxidative polycondensation. The characterizations of the synthesized Schiff base and poly(NIMP) were determined by ¹H NMR, ¹³C NMR, FT-IR, GPC and TGA techniques. The film of synthesized poly(NIMP) was prepared. The film thickness was found to be 106 μm. The optical band gap (E_g) values of the film were determined by UV-vis spectroscopy. Direct, indirect and forbidden indirect band gap (E_gd, E_gid and E_gfid) values of the film were found as 1.698, 1.223 and 1.461 eV, respectively. Surface properties of the film were investigated by Atomic force microscope (AFM). In the AFM results, the average surface roughness and average square root roughness were obtained as 2.46 and 3.79 nm, respectively. A negative skewness value exhibited dominant valleys while the high kurtosis value exhibited spiky features.