Faculty Publications
Permanent URI for this communityhttps://idr.nitk.ac.in/handle/123456789/18736
Publications by NITK Faculty
Browse
Search Results
Item Donor-acceptor polymers by solid state eutectic melt reaction for optoelectronic applications(Elsevier Ltd, 2017) Bathula, C.; Kang, Y.; Buruga, K.We report, the synthesis of novel donor–acceptor conjugated polymers based on benzo[1,2-b:4,5-b?]dithiophene (BDT) donor and 4,7-bis(5-bromothiophen-2-yl)benzo[c] [1,2,5]thiadiazole (DTBT) acceptor by solvent-free eutectic melt polymerization reaction (EMP). The most important fact is, reaction between solid reactants actually proceeds through bulk liquid phases, due to the formation of eutectics between the reactants and product(s) and any evolution of heat. In the present study, crystalline solid with moderately high vapor pressure and low melting temperature such as naphthalene is explored for forming eutectics in melt polymerization reaction. The HOMO and LUMO energy levels of the polymer P2 synthesized by EMP were found to be ?5.30 eV and ?3.77 eV. Optical bandgap was determined to be 1.53 eV. The solid-state reactions are important not only due to their high efficiency and selectivity but also for their more economical and eco-friendly procedures involved in the reaction. © 2017 Elsevier B.V.Item Optical, Electrochemical and Thermal Studies of Conjugated Polymers Synthesized by Eutectic Melt Reaction(Springer New York LLC barbara.b.bertram@gsk.com, 2017) Bathula, C.; Buruga, K.; Kang, Y.; Khazi, I.A.M.This paper reports on the synthesis of a novel donor–acceptor conjugated polymers, P1 and P2 by solvent free eutectic melt polymerization reaction. Triisopropylsilylethynyl(TIPS) substituted benzo[1,2-b:4,5-b?]dithiophene(BDT) is used as donor, thienithiophene(TT) and thienopyrroledione(TPD) are utilized as acceptors for demonstrating eutectic polymerization. The most important fact in the solvent-free reaction between solid reactants actually proceeds through bulk liquid phases. Such liquid phases are possible due to the formation of eutectics between the reactants and product(s) and any evolution of heat. Naphthalene is explored in this reaction for forming eutectics with the reactants, resulting in desired polymers. Thermal stability, optical and electrochemical properties of these polymers were determined. Optical band gaps of the polymers were found to be 1.58 and 1.65 eV. Electrochemical studies by cyclic voltametry experiment revealed HOMO and LUMO energy levels to be ?5.22, ?5.60 eV, and ?3.76, ?4.16 eV, respectively. The polymers were thermally stable up to 285–400 °C. Thermal, optical and electrochemical studies indicated these materials to be promising candidates in organic electronic applications. © 2017, Springer Science+Business Media New York.