Đơn vị công tác
1University of Engineering and Technology, Vietnam National University at Hanoi
Corrosion can be controlled by isolation of the metal from the corrosive environment. Isolation of corrodible metals from corrosive environments is probably the most general method of the corrosion protection afforded by paint films, sealers and lining on base materials. Fluoropolymers provide superior chemical resistance and are used in a variety of markets. These polymers are widely used to seal and isolate materials, especially under harsh conditions, in the chemical process industries and in the semi conductor, pharmaceutical, and biotechnology industries, where contamination may be critical. This study investigated the phenomenon of permeation only into the fluoropolymers materials lining under corrosive environment. Permeation behavior of water and acid solution or vapor into undegradable polymer is studied and explained. The weight changes generally increase with the increase of temperatures. Relatively rapid diffusion rate of water in the fluoropolymers sheets were observed from these results. Ethylene tetrafluoroethylene (ETFE) sheet absorbed less water but has the biggest diffusion coefficient than other fluoropolymers in this research. The highest weight uptake is obtained for PFA sheet immersion. The transport of water vapor is considered the same as water solution. In other words, they might move in the same phase. Weight changes could be plotted against square root time following Fickian diffusion type. Activation energy of water diffusion in fluoropolymer in liquid phase is higher than in vapor phase. The weight of fluoropolymers sheets could be recovered to the initial weight after dried at 50oC for four days.
Trích dẫn bài báo
Dinh Van Chau (2019), Permeation Behavior of Water and Acid Solution/vapor into Undegradable Polymer. Tạp chí Khí tượng Thủy văn, EME2, 164-173.
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