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Environmental fate & pathways

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PMVE is a gas. In the atmosphere the substance is rapidly degraded by reactions with photochemically produced hydroxyl radicals (OH). The products of the atmospheric degradation of PMVE are the same generating from HFCs photooxydation (HF, CF3OCFC(O)F) and do not contribute to ozone depletion.

With respect to reactions with hydroxyl radicals, a rate constant of (2.6 +/- 0.3) x 10^-12 cm3 molecule^-1s^-1at 296 K in 700 Torr of air and an atmospheric lifetime of 0.023 years (8 days) have been estimated for PMVE

(Mashino, M. et al, 2000).The global warming potential (GWP) for PMVE, estimated using the radiative forcing, lifetime and molecular weight, was considered to be negligible(Zhuangjie L. et al, 2000)

 

Due to the gaseous nature of the substance and its tendency to distribute into the air, the hydrolytic degradation of PMVE is neither measurable nor expected. According to section 2 of REACH Annex XI, testing hydrolysis is not technically feasible as PMVE is a volatile gas at ambient conditions.

Although no partition into water is expected, the tendency to hydrolyze has been however assessed basing on the chemical structure of PMVE molecule.

This does not contain any functional groups associated with hydrolysis properties at relevant environmental conditions.

Particularly, the carbon-fluorine bond is the strongest bond in organic chemistry (O'Hagan, 2008). Substitution of hydrogen atoms with fluorine results in increased bond strengths for both carbon-fluorine and adjacent carbon-carbon bonds over the corresponding hydrocarbon and would increase the resistance to hydrolysis (Lemal, 2003). Therefore, based on this qualitative structure-activity relationship, it can be concluded that hydrolysis is not a relevant degradation mechanism for PMVE.