Photo-oxidative Aging Behaviors of Acrylic Coatings during UV Irradiation Investigated by Positron Annihilation Spectroscopy
Xipo Zhao a, Xiaolin Cai a, Chang Liu a, Ting Chen a, Chunqing He a, Pengfei Fang b and Shaoxian Peng a
aHubei Provincial Key Laboratory of Green Materials for Light Industry, Collaborative Innovation Center of Green Light-weight Materials and Processing, School of Materials Science and Engineering, Hubei University of Technology, Wuhan 430068, China
b School of Physics and Technology, Wuhan University, Wuhan, 430072, China
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Slow positron annihilation spectroscopy, contact angle and scanning electron microscope (SEM) were employed to investigate the surface polarity and morphologies as functions of aging time in acrylic coatings during UV-a irradiation. The S parameter plots of each exposed sample are lower than that of the virgin sample in the whole range of E. The S parameter plots become lower as the exposing longer time, indicated that the irradiation generated more polar groups and increased the oxidation layer depth. Combined with surface morphology and the surface energy of acrylic coating, the variation of contact angle, and surface energy, polar component and dispersive component is related with surface polarity and morphologies.

DOI: 10.12693/APhysPolA.132.1527
topics: Acrylic coating, UV irradiation, positron annihilation spectroscopy