Impact of ultraviolet aging on the composition and characteristics of multifunctional composite coatings

Author:

Wang Yanyan12,Liu Siyu12,Yin Xiaoqing12,Pang Nan12,Yu Meijie12ORCID,Wang Chengguo12

Affiliation:

1. Key Laboratory of Liquid‐Solid Structural Evolution and Processing of Materials of Ministry of Education Shandong University Jinan China

2. Carbon Fiber Engineering Research Center School of Materials Science and Engineering, Shandong University Jinan China

Abstract

AbstractMultifunctional composite coatings exposed to environmental conditions are prone to aging and potential functional failure due to ultraviolet (UV) radiation. This study investigates the impact of UV radiation on the structure and properties of low infrared emissivity composite coatings, comprising ethylene propylene diene monomer (EPDM) as the matrix and antistatic carbon fiber (CF) and flaky floating aluminum powder as fillers. In addition to analyzing the photochemical degradation reactions of the composite coating under UV irradiation, the role of fillers in resisting UV aging is elucidated. The performance parameters examined include infrared (IR) emissivity, surface resistivity, mechanical properties, and dielectric properties. The results indicate that after UV aging, EPDM undergoes the most significant changes, leading to the formation of carbonyl groups. CFs experience mild UV aging and an increase in resistivity. Aluminum powder, on the other hand, remains largely unchanged after UV aging and its addition significantly reduces the UV aging rate of the composite coating, resulting in a low IR emissivity of as low as 0.2 after UV aging. Among them, Coating 4 exhibits the best overall performance after UV aging.Highlights The UV aging mechanism of EPDM and the role of fillers were revealed. The UV aging of the coating significantly reduced the infrared emissivity (Reduced from 0.5 to 0.2). Al powder effectively reduced the UV degradation rate of the coating by reflecting UV light. The properties of the double‐formulated coating perform best after UV aging.

Funder

National Natural Science Foundation of China

Key Technology Research and Development Program of Shandong Province

Publisher

Wiley

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