Synthesis Cobalt Complexed Single Chain Polymer and its Nanographene-based Composites, Electrical, Optical, and Thermal properties

Abstract

Abstract Atom transfer radical polymerization (ATRP) technique was used in the preparation of Poly [4-((4-vinylbenzyl)oxy) phthalonitrile-co-methyl methacrylate] P(VBOPN 13.4%- co-MMA) at a temperature of 110oC. Single chain polymer complexed cobalt phthalocyanine (SCP-CoPc) have been synthesized via cyclotautomerization approach using aforementioned copolymer caring VBOPN pendant group to form green colored single chain folded polymer molecule at a high range of temperature 140-150oC and high dilution condition of cyclohexanol solvent. The formation of cobalt atom collapsed via intramolecular forces into single chain polymer was characterized by Fourier-transform infrared spectroscopy and UV/Vis spectroscopy and shows high solubility in most organic solvents. The thermal of SCP-CoPc and nanogaphene-based SCP-CoPc/NG 6 wt% nanocomposite as well as electrical, dielectric, and optical properties of both materials were investigated. SCP-CoPc/NG 6 wt% nanocomposite was observed to have temperature-dependent increases in dielectric and dc. electrical conductivity. The activation energy, Ea was found to be 0.295 eV for the I. region and 0.39 eV for the II region, demonstrating that the conduction followed the Arrhenius equation. Estimates were made regarding the optical constants of SCP-CoPc/NG 6 wt%, specifically the refractive index, the real value of the optical dielectric constant, and the optical band gap. Both the direct band gap and the refractive index of SCP-CoPc and SCP-CoPc/NG 6 wt% were calculated, and the direct band gap of SCP-CoPc was calculated to be 2.83 eV, while the direct band gap of SCP-CoPc/NG 6 wt% was calculated to be 2.58 eV.