Effect of Ultraviolet Absorber on Photo-Degradation of Epoxy Coating Studied by Slow Positron Beam

• Authors: Zheng Wang , Fuwei Liu , Jingjing Li , Chunqing He , Xiangyang Peng , Zhen Huang , Pengfei Fang
• Languages of publication: EN

Abstracts

EN

The photo-degradation progress of epoxy coating and the effect of ultraviolet absorber under UV-B irradiation have been investigated in slow positron beam and by the Fourier transform infrared spectrometer. After 120 h of irradiation, the value of S parameter in sample bulk is reduced while compared with the virgin sample. The result is mostly due to post-cure process happening in this initial irradiation stage. As the irradiation time increases to 360 h, the S parameter decreases sharply. This is due to the growth of carbonyl group and the generation of free radical. After 528 h or longer time of irradiation, a very low S value was obtained near sample surface, indicating the formation of a dead surface layer. Positron results also reveal that the addition of ultraviolet absorber suppresses the development of the dead layer after long-term UV-B irradiation. Ultraviolet absorber has a suppressing effect on generation of polar groups towards sample bulk. The addition of ultraviolet absorber is a key factor that affects the photo-degradation of epoxy coating.

Keywords

EN

epoxy coating; photo-degradation; ultraviolet absorber; slow positron beam; microstructure

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 132
• Issue: 5
• Pages: 1523-1526

Dates

published

2017-11

Contributors

author

Zheng Wang

• Department of Physics and Hubei Nuclear-Solid Physics Key Laboratory, Wuhan University, Wuhan 430072, China

author

Fuwei Liu

• Department of Physics and Hubei Nuclear-Solid Physics Key Laboratory, Wuhan University, Wuhan 430072, China

author

Jingjing Li

• Department of Physics and Hubei Nuclear-Solid Physics Key Laboratory, Wuhan University, Wuhan 430072, China

author

Chunqing He

• Department of Physics and Hubei Nuclear-Solid Physics Key Laboratory, Wuhan University, Wuhan 430072, China

author

Xiangyang Peng

• Electric Power Research Institute of Guangdong Power Grid Co., Ltd, Guangzhou 510080, China

author

Zhen Huang

• Electric Power Research Institute of Guangdong Power Grid Co., Ltd, Guangzhou 510080, China

author

Pengfei Fang

• Department of Physics and Hubei Nuclear-Solid Physics Key Laboratory, Wuhan University, Wuhan 430072, China

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Identifiers

DOI

10.12693/APhysPolA.132.1523