Synthesis, characterization, optical, and electrochemical properties of thermal stable novel poly(azomethine-ether)s

• Published in: Designed monomers and polymers Vol. 17; no. 5; pp. 481 - 490
• Main Authors: Kaya, İsmet, Avcı, Ali, Kolcu, Feyza, Çulhaoğlu, Suleyman
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 04.07.2014
• Subjects: band gap; cyclic voltammetry; poly(azomethine-ether)s; thermal analysis; thermally stable polymers
• ISSN: 1568-5551; 1568-5551
• DOI: 10.1080/15685551.2013.867581

In this study, the novel Schiff base monomers were synthesized by condensation reactions. Then, these monomers were converted to poly(azomethine-ether)s by oxidative polycondensation (OP) reactions in an aqueous alkaline medium. The structural characterizations of compounds were carried out by FT-IR, NMR, and size exclusion chromatography (SEC). According to the SEC analysis, the calculated number-average molecular weight (M n ), weight average molecular weight (M w ), and polydispersity index values of P-2 and P-4 were found to be 17,500 g mol −1 , 24,400 g mol −1 , and 1.39; and 18,700 g mol −1 , 25,600 g mol −1 , and 1.36, respectively. The HOMO-LUMO energy levels, electrochemical ( ), and optical (E g ) band gaps of polymers were calculated from cyclic voltammetry (CV) and UV-vis measurements, respectively. CV was used to determine the electrochemical oxidation-reduction characteristics of polymers. Thermal characterizations of compounds were made by using TG-DTA and DSC techniques. According to TG analysis, polymers with higher initial degradation temperatures (T on ) than those of their monomers indicate that the synthesized polyphenols have higher thermal stabilities than their monomer species.