Methacrylate based copolymers containing thermal and UV cross-linkable groups were prepared, ad their optical properties were investigated. Copolymerization of octafluoropentyl methacrylate (OFPMA) with hydroxyethyl methacrylate (HEMA) was followed by reacting HEMA and methacrylic anhydride (MAAN), yielding a fluorinated copolymer with cross-linkable pendant group. The refractive indices of the copolymers before cross-linking ranged from 1.4329 to 1.4646, and those of the cross-linked copolymers varied from 1.4500 to 1.4822, depending on the fluorine content.
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