| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 102 === Two novel conjugated polymers, PHPYFLC8 and PHPYFLC6, containing unsymmetrical substituted bi-triarylamine with pyrene moiety were synthesized via Suzuki coupling. The glass transition temperature (Tg), 10% weight-loss temperatures (Td10) in nitrogen, and char yield at 800 oC in nitrogen of PHPYFLC8 were 169oC, 445oC, 61.8% respectively, while PHPYFLC6 were 206oC, 456 oC, 59.4%, respectively. Cyclic voltammogram (CV) of the polymer film cast onto an indium-tin oxide (ITO)-coated glass substrate exhibited two reversible redox couples at 0.65 and 0.98 V for PHPYFLC8 vs Ag/Ag+ in acetonitrile solution, while PHPYFLC6 were 0.66 and 1.02 V. The HOMO and LUMO levels for PHPYFLC8 were -4.95 and -2.31 eV, respectively, while for PHPYFLC6, the HOMO and LUMO levels were -4.97 and -2.16 eV respectively. The polymers dissolved in different solvents can emit green, yellow, pink and even white color after excitated by a 365 nm monochromatic light source. The polymer films revealed excellent stability of electrochromic characteristics, with a color change from yellow green (neutral) to deep purple (oxidized) at applied potentials ranging from 0 to 1.5 V which suggested that the polymers are good electrochromic materials. The PHPYFLC6 forms a more compact film than PHPYFLC8 when cast onto the ITO-coated glass, which facilitates the electron transfer for the electrochromism phenomena. The theoretical study conducted is in agreement with the experimetal results.
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