含三苯胺及1,3,4-噁二唑結構之聚丙烯醯胺合成與性質研究

Abstract

We synthesized two acrylamide monomers containing triphenylamine and 1,3,4-oxadiazole. The free radical polymerization of the two acrylamide monomers was initiated by 2,2'-azobisisobutyronitrile (AIBN). The homopolymers and the random copolymers with pendent triphenylamine or 1,3,4-oxadiazole structures were polymerized by different feeding ratio. The thermal properties, optical properties and solubility of the polymers were investigated and discussed. The structures of monomers and polymers were configured by Mass spectrometry, FT-IR and NMR. The polymers showed excellent solubility in aprotic polar solvents like NMP, DMF or DMSO, then obtained polymers were able to soluble in most polar organic solvent when the number of triphenylamine structure increased. The polymers exhibited UV-vis absorption bands at 304 to 306nm in THF solution. The glass transition temperatures are about 180 to 225℃, the temperature at 5% and 10% weight loss measured by a TGA were 352 to 362℃ and 365 to 372℃ under nitrogen.. The inherent viscosity of the polyacrylamides were 0.12~0.21 dL/g. The polyacrylamide films exhibited UV-Vis absorption band at 308~323.5 nm and showed PL maxima emission peaks at 387~470nm in THF solution. Cyclic voltammestry curves of the polymers in DMF solution showed one pair of reversible redox peaks. The energy levels of the HOMO and the LUMO wewe respectively estimated as -6.72~ -6.56 eV and -3.41~ -4.31 eV from the reduction potential and the onset absorption wavelength of the UV-vis spectrum.