Wavelength-dependent photoaging mechanism of organic thermochromic materials

Related Articles

Abstract Two three-component reversible thermochromic materials, with phenyl benzoate and 1-octadecanol as the solvent respectively, were employed to study the photoaging mechanism of electron-transfer-based organic thermochromic materials. Five light sources with different wavelengths were exerted to illuminate the thermochromic materials. UV light sources have a center wavelength of 254 nm, 302 nm, 365 nm and 395 nm respectively, and the visible light source is a xenon lamp with a wavelength range of 400—1000 nm. The aging progress together with the phenomenon of thermochromic materials were showed and the ¹H NMR spectra of each irradiated-component were analyzed to investigate their changes by the irradiation of different light sources. The retention content of each component was evaluated to discover the different changes of thermochromic materials with the various wavelength of light sources. Our results suggest that UV-light-induced photoaging of thermochromic materials is mainly caused by the photodegradation of components, and visible-light-induced photoaging of thermochromic materials is primarily due to the loss of solvent component. As the wavelength of UV lights reduces, the photodegradation rate of phenyl benzoate and thermosensitive green dye increases, resulting in the accelerated photoaging rate of corresponding thermochromic materials; whereas the negligible degradation effect of 1-octadecanol by UV lights leads to little degradation of corresponding thermochromic material. Under the visible light, the fact that the loss of phenyl benzoate is much greater than that of 1-octadecanol shows the faster photoaging of phenyl benzoate-based thermochromic material in comparison with 1-octadecanol-based thermochromic material. In conclusion, a wavelength-dependent photoaging mechanism has been discovered for three-components thermochromic materials and this sheds a new light on the anti-photoaging strategy of organic reversible thermochromic materials.

	Service

	Email this article
	Add to my bookshelf
	Add to citation manager
	Email Alert
	RSS
	Articles by authors
	LI Ruizhen
	ZHAO Zhen
	LOU Hongfei
	LI Wei
	LIU Dongzhi
	ZHOU Xueqin

Keywords： organic reversible thermochromic materials photoaging photodegradation aging-rate mechanism

Received 2022-04-29;

About author:

Cite this article:

LI Ruizhen, ZHAO Zhen, LOU Hongfei, LI Wei, LIU Dongzhi, ZHOU Xueqin.Wavelength-dependent photoaging mechanism of organic thermochromic materials[J] Chemcial Industry and Engineering, 2024,V41(4): 20-27

[1] CHENG Y, ZHANG X, FANG C, et al. Discoloration mechanism, structures and recent applications of thermochromic materials via different methods: A review[J]. Journal of Materials Science & Technology, 2018, 34(12): 2225-2234
[2] MA X, ZHAO S, WANG L, et al. Research on the behaviors of extending thermochromic colors for a new thermochromic microcapsule[J]. The Journal of the Textile Institute, 2020, 111(8): 1097-1105
[3] WANG Y, WU R, FENG M, et al. Synthesis of microcapsules with waste oil core and application in self-healing asphalt[J]. Petroleum Science and Technology, 2020, 38(3): 203-209
[4] MILOŠEVI? R, KAŠIKOVI? N, CIGULA T, et al. The characterization of microcapsules printed by screen printing and coating technology[J]. Journal of Graphic Engineering and Design, 2017, 8(1): 45-56
[5] MA X, WANG L, LI L, et al. The novel thermochromic and energy-storage microcapsules with significant extension of color change range to different tones[J]. Journal of Macromolecular Science, Part A, 2019, 56(6): 588-596
[6] ZHU C, WU A. Studies on the synthesis and thermochromic properties of crystal violet lactone and its reversible thermochromic complexes[J]. Thermochimica Acta, 2005, 425(1/2): 7-12
[7] HU L, LYU S, FU F, et al. Preparation and properties of multifunctional thermochromic energy-storage wood materials[J]. Journal of Materials Science, 2016, 51(5): 2716-2726
[8] SHARMA M, WHALEY M, CHAMBERLAIN J, et al. Evaluation of thermochromic elastomeric roof coatings for low-slope roofs[J]. Energy and Buildings, 2017, 155: 459-466
[9] 王雅群, 陈萌, 周桂月, 等. 电力设备测温用可逆热致变色材料的老化特性研究[J]. 绝缘材料, 2018, 51(12): 16-22 WANG Yaqun, CHEN Meng, ZHOU Guiyue, et al. Ageing characteristics of reversible thermochromic materials used for temperature measurement of power equipment[J]. Insulating Materials, 2018, 51(12): 16-22(in Chinese)
[10] CHEN Z, ZHANG H, DUAN H, et al. Long-term photo oxidation aging investigation of temperature-regulating bitumen based on thermochromic principle[J]. Fuel, 2021, 286: 119403
[11] KARLESSI T, SANTAMOURIS M, APOSTOLAKIS K, et al. Development and testing of thermochromic coatings for buildings and urban structures[J]. Solar Energy, 2009, 83(4): 538-551
[12] 牟明鹏. 有机可逆热致变色材料的制备研究[D]. 沈阳: 沈阳理工大学, 2020 MOU Mingpeng. Preparation and study of organic reversible thermochromic materials[D].Shenyang: Shenyang Ligong University, 2020 (in Chinese)
[13] 齐萌, 王琼, 王新宇, 等. 热敏微胶囊的制备与性能研究[J]. 印染助剂, 2014, 31(4): 28-31 QI Meng, WANG Qiong, WANG Xinyu, et al. Study on preparation and performance of thermochromic microcapsules[J]. Textile Auxiliaries, 2014, 31(4): 28-31(in Chinese)
[14] ÖZKAYALAR S, ADIGVZEL E, ALAY AKSOY S, et al. Reversible color-changing and thermal-energy storing nanocapsules of three-component thermochromic dyes[J]. Materials Chemistry and Physics, 2020, 252: 123162
[15] 高力娇, 朱晓冬, 刘乾, 等. 改性热敏黑温致变色木材的耐老化性研究[J]. 森林工程, 2018, 34(4): 63-69 GAO Lijiao, ZHU Xiaodong, LIU Qian, et al. Study on aging resistance of modified thermosensitive black thermochromic wood[J]. Forest Engineering, 2018, 34(4): 63-69(in Chinese)