Atmospheric chemistry of CF3CHFCF2OCH2CF2CF3: Kinetics and mechanism on the (OH)-O-0.7 center dot-initiated degradation and subsequent reactions in the presence of O-2 and NO

Atmospheric degradation mechanisms of CF3CHFCF2OCH2CF2CF3 initiated by (OH)-O-center dot radical were researched by DFT calculations. Two H-abstraction channels from the -CHF- and -CH2- groups were found and the latter was dominated pathway because of its lower barrier. The calculated CVT/SCT rate constants agree well with measured values (253-328 K). The results of subsequent reactions show that CF3CHFCF2OC(ONO2)HCF2CF3, CF3CHFCF2OC(OOH)HCF2CF3, CF3CF2COOCF2CHFCF3, and CF3CHFCF2OCHO are the possible products in the presence of NO, O-2, and HO2 center dot. The GWP(100) of CF3CHFCF2OCH2CF2CF3 was estimated to be 365.68, showing that its contribution to greenhouse effect cannot be overlooked.