标题：Light- and heat-triggered reversible luminescent materials based on polysiloxanes with anthracene groups
作者：Han, Dongdong; Lu, Hang; Li, Wensi; Li, Yonghao; Feng, Shengyu
作者机构：[Han, Dongdong; Lu, Hang; Li, Wensi; Li, Yonghao; Feng, Shengyu] Shandong Univ, Sch Chem & Chem Engn, Key Lab Special Funct Aggregated Mat, Key Lab Co 更多
通讯作者地址：[Feng, SY]Shandong Univ, Sch Chem & Chem Engn, Key Lab Special Funct Aggregated Mat, Key Lab Colloid & Interface Chem,Minist Educ, Jinan 250100, Shand 更多
摘要：In this study, reversible silicone elastomers were successfully developed by light-triggered dimerization and heat depolymerization of the anthryl groups. Polysiloxanes with anthryl groups were prepared from poly(aminopropylmethylsiloxane) (PAPMS) with electron-donating (9-anthracenylmethyl acrylate) and electron-withdrawing (anthracene-9-carboxylic acid) units. The cross-linking networks were formed with the via 4 pi-4 pi photo-cycloadditions of the anthryl groups upon the UV light excitation (365 nm). 9-Anthracenylmethyl acrylate or anthracene-9-carboxylic acid efficiently dimerized through the photodimerization of the anthryl groups in the organic solvents, which was proven by UV-vis spectra, NMR spectra, and LC/MS. The covalent bonds between pendant anthryl groups were cleaved after heating at 120 degrees C. Furthermore, repeatable dimerization-depolymerization conversion was confirmed. In addition, for the first time, we found that the sunlight can also initiate the cycloaddition, which was "greener" and more environment-friendly. The green luminescence was observed from the PAPMS-1 film instead of the quenching effect caused by aggregation after the cycloaddition. Thus, a colorful UV-light emitting diode (LED) cell was obtained by coating the films on the commercially available LED cell.