Synthesis, optical and electrochemical characterizations of furan-, carbazole-, and thiophene-containing polydithienylpyrroles

• Main Authors: CHIANG, MENG-HSIN, 蔣孟妡
• Other Authors: WU,TZI-YI
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/94z82t

碩士 === 國立雲林科技大學 === 化學工程與材料工程系 === 106 === Ethylfuran, ethylthiophene, ethylcarbazole, and furan units are incorporated as the pendants of dithienylpyrroles by an imine linkage group, which are denominated as DTPEF, DTPET, DTPEC, and DTPFY, respectively. Their corresponding polymer films (PDTPEF, PDTPET, PDTPEC, and PDTPFY) are synthesized using electrochemical polymerization. The optical and electrochemical properties of four anodically coloring polymers, such as UV/Vis absorbance, optical contrast, optical stability, coloration effiency, and color variations are characterized. PDTPET film shows the highest ∆Tmax (47.12% at 900 nm) and a distinct color transition with five various colors (gingerish yellow at -0.4 V, bluish auburn at 0 V, pale pinkish grey at 0.4 V, yellowish green at 0.8 V, and bluish green at 1.2 V) from the neutral state to the oxidized state. Moreover, PDTPEF film reveals the shortest switching time (1.23 s at 900 nm) and the highest coloration efficiency (262.85 cm2/mC at 850 nm) in a liquid solution. Dual-type electrochromic devices (ECDs) are assembled using four anodically coloring polymers (PDTPEF, PDTPET, PDTPEC, and PDTPFY) and three cathodically coloring polymers. PDTPEC/PProDOT-Et2 ECD reveals the highest ∆Tmax (51.9% at 590 nm), and a distinct color transition with five various colors (gingerish yellow at -0.6 V, bluish auburn at 0 V, blue at 0.4 V, dark blue at 0.8 V, and navy blue at 1.2 V) from the bleached state to the colored state. PDTPFY/PProDOT-Et2 shows the best optical stability (98.36% at 500 nm), PDTPEC/PProDOT-Bz2 ECD reveals the shortest switching time (1.06 s at 590 nm), and PDTPET/PProDOT- Bz2 ECD displays the highest coloration efficiency (884.61 cm2/mC at 850 nm). Considering these results, PDTPEF, PDTPET, PDTPEC, and PDTPFY show Potentials for use in various types of electrochromic products.