期刊
PHYSICA B-CONDENSED MATTER
卷 422, 期 -, 页码 36-39出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physb.2013.04.033
关键词
Composite coatings; Infrared emissivity; One-dimensional photonic structure; Optimum pigment content; Mechanical properties
资金
- National Natural Science Foundation of China [51173079]
Polyurethane (PU)/Ag composite coatings with low infrared emissivity were successfully prepared by using PU and flaky Ag powders as adhesives and pigments, respectively. The infrared emissivity and microstructure of as-prepared products were systematically investigated by infrared emissometer and scanning electron microscopy, respectively. Infrared emissivity measurement shows that the emissivity of the coatings approaches the lowest value of 0.082 at the wavelength of 8-14 mu m when the Ag content is about 20 wt%. Microstructure observation shows that the coatings have similar one-dimensional photonic structural characteristics. According to the structural characteristics, a simulation method for optimum pigment content and the cause of low infrared emissivity of the coatings were successfully obtained and discussed by using the theories of one-dimensional photonic structure, respectively. The results indicate that the low infrared emissivity of PU/Ag composite coatings is derived from the similar one-dimensional photonic structure in the coatings, and the calculated optimum Ag content is in good agreement with the experimental value, which reveals that it is a practical simulation method for optimum pigment content of low infrared emissivity composite coatings. (C) 2013 Elsevier B.V. All rights reserved.
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