High temperature thermochromic polydiacetylenes: Design and colorimetric properties

• Published in: Applied surface science 2017-11, Vol.423, p.951-956
• Main Authors: Huo, Jingpei, Hu, Zhudong, He, Guozhang, Hong, Xiaxiao, Yang, Zhihao, Luo, Shihe, Ye, Xiufang, Li, Yanli, Zhang, Yubo, Zhang, Min, Chen, Hong, Fan, Ting, Zhang, Yuyuan, Xiong, Bangyun, Wang, Zhaoyang, Zhu, Zhibo, Chen, Dongchu
• Format: Article
• Language: English
• Subjects: Chromoisomerism; High temperature; Polydiacetylenes
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2017.06.198

[Display omitted] •All the samples could turn blue and red successively over a wide range from room temperature to above 250°C.•The resulting polymers possess high thermal stability and reversibility in the chromatic transition under heating.•PDA 2c containing mutli-pyrene moiety is much better, showing reversible thermochromic property up to 300°C. Three novel polydiacetylenes (PDAs) are synthesized through the self-assembly followed by the topochemical polymerization via controllable electrophoretic deposition. All the samples could undergo a multi-step thermochromic process, turning purple and red successively over a wide range from room temperature to above 250°C. Resulting PDAs are studied by UV–vis, IR, Raman spectroscopies, and chromoisomerism by naked eye visualization; their stabilities by thermogravimetric method, and emission behavior by fluorescence spectroscopy. To study the mechanism of the thermochromic response, temperature-dependent UV–vis spectra, the results of which successfully highlighted the close relationship between chromatic transitions and the conformational changes.