tailieunhanh - Permeation behavior of water and acid solution vapor into undegradable polymer

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. | Permeation behavior of water and acid solution vapor into undegradable polymer BÀI BÁO KHOA HỌC DOI:(EME2).164-173 PERMEATION BEHAVIOR OF WATER AND ACID SOLU- TION/VAPOR INTO UNDEGRADABLE POLYMER Dinh Van Chau1 Abstract: 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. Fluoropoly- mers 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 con- tamination may be critical. This study investigated the phenomenon of permeation only into the flu- oropolymers materials lining under corrosive environment. Permeation behavior of water and acid solution or vapor into undegradable polymer is studied and explained. The weight changes gener- ally increase with the increase of temperatures. Relatively rapid diffusion rate of water in the fluo- ropolymers sheets were observed from these results. Ethylene tetrafluoroethylene (ETFE) sheet absorbed less water but has the biggest diffusion coefficient than other fluoropolymers in this re- search. 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 en- ergy 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. Keywords: Polymer lining, .

• Môi trường
• Polymer lining
• Semi conductor
• Biotechnology industries
• Ethylene tetrafluoroethylene
• Fickian diffusion type