4.7 Article

Thermally Cross-Linked Copolymer for Highly Transparent to Multicolor-Showing Electrochromic Materials

期刊

ACS APPLIED POLYMER MATERIALS
卷 5, 期 5, 页码 3595-3603

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsapm.3c00250

关键词

electrochromic; thermally cross-linked; triphenylamine; multicolor-showing; cycling stability

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A triphenylamine derivative STPA was synthesized by introducing thermally cross-linked vinyl group at the end of 4-methoxytriphenylamine. The corresponding polymer pSTPA was prepared by a thermal polymerization reaction without any initiator. A copolymer pSTPA-co-TPA-OCH3 was prepared by combining STPA with methoxy-modified triphenylamine derivative TPA-OCH3 monomers. The copolymer film showed multicolored appearance, high optical contrast, large coloration efficiency, and good cycling stability.
A triphenylamine derivative STPA was designed and synthesized by introducing thermally cross-linked vinyl group at the end of 4-methoxytriphenylamine. The corresponding polymer pSTPA was prepared by a thermal polymerization reaction without any initiator. CV tests reveal that pSTPA has a pair of distinct redox peaks. Spectroelectrochemical results demonstrates that pSTPA has a maximum absorption peak at 354 nm and a new absorption peak at 730 nm with increasing voltage, accompanied with the polymer from transparent to blue. In order to realize multicolor showing and improve the cycling stability, the corresponding copolymer pSTPA-co-TPA-OCH3 was further prepared via thermally cross-linked vinyl groups by combining STPA with methoxy-modified triphenylamine derivative TPA-OCH3 monomers in a molar ratio of 1:1. As expected, the copolymer film presents a multicolored appearance with four color changes (transparent-dark yellow-sky blue-purple), high optical contrast (45.0% at 480 nm, 56.1% at 700 nm, and 82.4% at 910 nm, respectively), large coloration efficiency of 287 cm2/C (at 910 nm), and good cycling stability (essentially no degradation of optical contrast over 2000 cycles). Therefore, this work puts forward an effective method to achieve a highly transparent to multicolor-showing electrochromic polymer via thermally cross-linked copolymerization, which shows potential applications in smart windows, sunglasses, and electronic tags.

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