Synthesis and Characterization A Novel Thermally Stable Schiff Base Oligomer: Investigation of Conductivity Properties

Abstract

This paper presents design of a novel Schiff base, 2,2'-{[1,2-di(pyridin-2-yl)ethane-1,2-diylidene]bis(azanylylidene)}diphenol (2,2-DBD), and its oligophenol, Oligo-(2,2'-{[1,2-di(pyridin-2-yl)ethane-1,2-diylidene]bis(azanylylidene)}diphenol) O(2,2-DBD), synthesized with NaOCl and O₂ oxidants in aqueous alkaline medium by oxidative polycondensation reaction. The effects of oxidant type, polymerization temperature and time on oligomer yield were determined. Characterization of the structures of the synthesized (2,2-DBD) and O(2,2-DBD) were done by UV-Vis, FTIR and ¹HNMR techniques. Also, thermal degradations of the monomer and oligomer were investigated TG-DTG analysis and it was determined that the oligomer thermally stable up to 1200 ˚C. Additionally, electrical conductivity of the oligomer was improved by doping with iodine at 20 ˚C and the conductivity of the oligomer reached to 9x10^-4 S/cm by increasing 10⁷ at the end of the 48 h doping time fold according to its undoped form.

Keywords

• Conductivity,oxidative polycondensation,oligophenols

References

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