Synthesis, characterization, optical and electrochemical band gaps of green poly(azomethine-ester)s containing oxalyl and succinyl units

[摘要] A new series of poly(azomethine-ester)s (PAZ-E)s with different (turning ortho, meta and para) positions weresynthesized by condensation polymerization. The chemical structure of polymers was verified by ${}^1$H-NMR, ${}^{13}$C-NMR, FTIR and UV–Vis measurements. Electrochemical characteristics of the corresponding polymers were obtained with cyclic voltammetric (CV) analysis. Thermal characteristics of the obtained polymers were analysed by TG-DTA, DMA and DSC measurements. The first degradation temperature values of PAZ-E compounds were found between 198 and 250$^{\circ}$C from TGA measurements. Photophysical characteristics of the obtained polymers were explained with photoluminescence (PL) spectroscopy.Molecularweight distributions of (PAZ-E)s were obtained by gel permeation chromatographic (GPC) analysis. Two- and three-dimensional (2D and 3D) properties and images of the synthesized (PAZ-E)s were analysed by SEM and AFM surface analysis techniques, respectively. Electrochemical band gap ($E^{\prime}_{\rm g}$) values of (PAZ-E)s P-9, P-10, P-11, P-12,P-13 and P-14 were calculated as 2.58, 2.14, 1.90, 2.06, 1.89 and 1.69 eV, respectively. The $E^{\prime}_{\rm g}$ g values of the (PAZ-E)s werefound to be quite low.

[学科分类] 材料工程

[关键词] Poly(azomethine-ester);schiff base;photophysical behaviour;electrochemical properties;thermal degradation;surface morphologies.