Synthesis and Characterization of UV-curable Fluorinated Poly(dimethyl)siloxanes as UV-transparent Coatings for Optical Fiber Gratings and for Membranes used in VOC Elimination

摘要

The synthesis of photocrosslinkable fluorinated polydimethylsiloxane was carried out through direct hydrosilylation of allyl perfluoroalkane or alkyl ether with copoly(dimethyl)(methyl-hydro)siloxane. The hydrosilylation of the fluorinated allyl compound allows the introduction of fluorinated groups onto the polysiloxane backbone. Then, a second hydrosilylation of allyl methacrylate led to poly(dimethyl)siloxane bearing both fluorinated and photocrosslinkable groups. The ratio between fluorinated groups and allyl methacrylate groups allowed to tune the refractive index of the resin without changing thermal properties. Formulations containing fluorinated poly(dimethyl)siloxane) were UV cured and their UV transparency and YAG laser resistance were investigated.