Add time:08/12/2019         Source:sciencedirect.com

The photochemical stability of copolymers of 2,2,2-trifluoroethyl methacrylate with butyl vinyl ether (TFEMA/BVE) and of methyl α-trifluoromethyl acrylate with 2-ethylhexyl vinyl ether, has been investigated under artificial solar light irradiation. In both copolymers, as well as in a reference ethyl methacrylate/BVE copolymer, the photoageing behaviour is controlled by the reactivity of the corresponding ether component. The degradation occurs mainly in the tertiary positions of the ether units, followed either by formation of γ-lactones or by chain scissions. Only in the case of TFEMA/BVE does the fluorinated methyl of the side chain have an influence on the degradation pathways, i.e. a clear inhibition of cyclization.

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