Synthesis of Reactive Water-Soluble Narrow-Band-Gap Polymers for Post-Crosslinking

• Published in: Polymers Vol. 12; no. 2; p. 313
• Main Authors: Guo, Hao-Xuan, Ohashi, Takehiro, Imai, Yusuke, Aota, Hiroyuki
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI 03.02.2020; MDPI AG
• Subjects: Communication; narrow-band-gap polymer; post-crosslinking; π-conjugated polymer; π-conjugated polymer, narrow-band-gap polymer, post-crosslinking
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym12020313

In this study, water-soluble, narrow-band-gap polymers containing reactive groups were prepared by the addition-condensation of pyrrole (Pyr), benzaldehyde-2-sulfonic acid sodium salt (BS), and terephthalaldehydic acid (TPA) or -hydroxybenzaldehyde ( -HB). TPA and -HB were used for the post-crosslinking reaction between polymers. The polymers were characterized by employing various analyses such as H-NMR, thermal gravimetric analysis (TGA), and UV-Vis-NIR. The values of polymers estimated from the absorption edges were 0.55 and 0.62 eV. The post-crosslinking reaction is important for preventing resolubilization and for developing an electron conducting route between the polymer chains. Herein, the post-crosslinked polymer was observed to maintain its narrow-band-gap and conductivity was increased 46 times compared to that observed before crosslinking.