Abstract
We synthesized three types of difluoro monomers containing triphenylamine and 1,3,4-oxadiazole. The monomers were polymerized with different bisphenols respectively to form novel poly( aryl ether )s by the nucleophilic displacement. According to the position of the fluoro atoms in the polymers, the thermal properties, optical properties and electrochemical properties of the polymers were investigated and discussed. The structures of monomers and polymers were confirmed by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy. The polymers showed excellent solubility in organic polar solvents such as NMP, DMF, DMSO, THF, and DCM. The polymers exhibited UV-vis maximum absorption bands about 280nm and 360nm, and showed PL maximum emission peaks at 458nm to 507nm in NMP solution. The glass transition temperatures ranged from 163 to 219°C, the temperature at 5% and 10% weight loss measured by TGA were in the range of 358 to 465°C and 392 to 486°C under nitrogen, respectively. The inherent viscosity of the poly( aryl ether )s were 0.10 ~ 1.26 dL/g. The electrochemical properties of the poly( aryl ether )s were investigated by cyclic voltammetry. The energy levels of the HOMO and LUMO were respectively estimated as -5.54 ~ -5.42 eV and -2.52 ~ -2.25 eV, respectively, calculated from the oxidation potentials and onset absorption wavelengths of the UV-vis spectra.
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