Synthesis and characterization of Cobalt doped Polymer Composite Poly [(Thiophene-2, 5-diyl)-co-para bromo benzylidene] by using Polycondensation Method

Abstract

In this study, we present one pot synthesis and characterization of undoped copolymer and cobalt doped polymer composite, Poly [(Thiophene-2, 5-diyl)- co-p-bromo benzylidene]. Both polymers were synthesized in the laboratory at normal conditions at very low cost by polycondensation of thiophene with pbromo aldehyde. Thiophene (0.02 mmoles) and pbromo benzaldehyde (0.02 mmoles) were refluxed electrically in paraffin oil bath at 87oC for 24 hours in 15 ml neutral solvent 1, 4 dioxan and in presence of catalyst (0.02 mmoles) POCl3 which is dehydrating agent. The reaction was monitored by TLC. After the completion of reaction, 100 ml methanol was added in order to obtain the undoped product. Synthesis of doped polymer was carried out by similar method but after completion of reaction 0.1 gm cobalt sulphate as a dopant was added in the reaction flask and refluxed further for two hours. Cobalt sulphate (0.1gm) was used as a dopant to obtain doped polymer. After completion of the reaction, 100 ml methanol was added to obtain the doped polymer. Then undoped and doped fine dark brown powders obtained were further purified using methanol and finally dried at room temperature for 24 hours. Doping effect on the polymer was also analyzed using different characterization techniques such as: UV-Vis, FTIR, 1HNMR, 13CNMR, XRD, FE-SEM, EDX and BET in order to investigate the physical properties.