| Summary: | 碩士 === 國立高雄應用科技大學 === 化學工程系碩士班 === 96 === Alternating and random copolymers based on 2,5-(bromomethyl)-1 -methoxy-4-(1-ethyl-hexyloxy)benzene as the p-type monomer and N-(2,5-bisbromothiophenyl) dipyrazamide as the n-type monomer were synthesized by Wittig coupling. On the other hand, block coplymers based on the same monomers were prepared by Stille coupling approach. All of the copolymerwere then characterized with FT-IR, 1H-NMR, TGA, DSC, UV-Vis, PL, and CV, etc.
FT-IR and 1H-NMR spectra confirmed the successful synthesis of all of the copolymer. TGA results showed increasing thermal stability with increasing ratio of n-type monomer. DSC curves indicated the elevated Tgs were due to the rigid structure of n-type monomer. UV-Vis spectra showed red-shift when the mole ratio of n-type monomer increased. Photoluminescence spectra showed the luminescent intensities decreased with the increase of the mole ratio of n-type monomer. This was probably due to the heavy atom effect of thiophene group on the n-type monomer, resulting the quench effect of the luminescence. Cyclic voltammetry results showed LUMO values decreased with the increase of the mole ratio of n-type monomer. This phenomenon was consistent with the transporting function of n-type monomer. Consequently, the introduction of electron transporting groups into the copolymers would reduce the LUMO values of copolymers and improve the injection property of electrons.
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