| http://www.w3.org/ns/prov#value | - a substrate and a barrier layer comprising a polymer film comprising the structure: wherein at least one of R??? and R??? is a fluorinated aromatic group and the other of R??? and R??? is independently selected from the group consisting of fluorinated alkyl groups; aromatic groups and fluorinated aromatic groups, wherein n is an integer, said polymer film made from a cyclic precursor. 19.
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