Syntheses and degradations of fluorinated heterocyclics II. Perfluoroalkyl and perfluoroalkylether-1,2,4-oxadiazoles |
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Authors: | KJL Paciorek RH Kratzer J Kaufman JH Nakahara RW Rosser JA Parker |
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Institution: | Ultrasystems, Inc., 2400 Michelson Drive Irvine, California 92715 U.S.A. |
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Abstract: | 3-Perfluoroalkylether-5-perfluoro-n-heptyl-1,2,4-oxadiazole and 3,5-bis(perfluoroalkylether)-1,2,4-oxadiazole were synthesized and characterized. The 3,5-bis(perfluoroalkylether)-1,2,4-oxadiazole was subjected to thermal, thermal oxidative, and hydrolytic degradations at 235 and 325°C and was found to be stable under these conditions as evidenced by practically quantitative recovery of the test samples. In the presence of Jet-A-fuel at 235°C a low degree of degradation,~4%, was observed. 3,5-Bis(perfluoro-n-heptyl)-1,2,4-oxadiazole was found to be stable to attack by water at 325°C; however in air in the presence of Jet-A at 235°C the extent of degradation was in excess of 10%. |
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