Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (8): 20220146.doi: 10.7503/cjcu20220146

• Material Chemistry • Previous Articles     Next Articles

Alkane Grafted Phase Change Azobenzene Materials Based on Low Temperature Heat Release

GAO Jian1, FENG Yiyu1,2(), FANG Wenyu1, WANG Hui1, GE Jing1, FENG Wei1,2()   

  1. 1.School of Materials Science and Engineering,Tianjin University,Tianjin 300354,China
    2.Key Laboratory of Advanced Ceramics and Processing Technology,Ministry of Education,Tianjin University,Tianjin 300072,China.
  • Received:2022-03-07 Online:2022-08-10 Published:2022-04-06
  • Contact: FENG Yiyu,FENG Wei E-mail:fengyiyu@tju.edu.cn;weifeng@tju.edu.cn
  • Supported by:
    the State Key Program of National Natural Science Foundation of China(51633007);the National Natural Science Foundation of China(51803151);the Science Foundation for Distinguished Young Scholars in Tianjin, China(19JCJQJC61700);the National Key Research and Development Program of China(2016YFA0202302)

Abstract:

Alkyl-grafted phase change azobenzenes, 4-pentyl-azobenzene(Azo5) and 2'-methyl-4-n-pentylazobenzene(AzoM5), with two different substituents were synthesized by the Mills method. The chemical structures of Azo5 and AzoM5 were characterized by nuclear magnetic resonance hydrogen spectroscopy and Fourier transform infrared spectroscopy. The isomerization performance, cycling stability, thermal storage, exothermic properties and the ability to release heat at ?10 ℃ of the materials were analyzed by ultraviolet-visible spectroscopy, differential scanning calorimetry and infrared thermography. The results show that Azo5 and AzoM5 exhibit low melting point and rapid isomerization transformation due to the low intermolecular force. And due to the photo-induced phase change at low temperature, the energy density increases significantly, reaching 216 and 218 J/g, respectively. Infrared thermography shows that Azo5 can achieve a temperature increase of 6 ℃ at low temperatures(-10 ℃) under visible light irradiation.

Key words: Phase change azobenzene, Photo-induced phase change, Photo-induced isomerization, Low temperature exothermic property

CLC Number: 

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