Abstract
The synthesis of two hybrid methacrylate-silicone-epoxycyclohexane monomers is described. These monomers were prepared by sequential hydrosilation reactions attaching first the 4-vinyl-1-cyclohexene 1,2-epoxide, using the Wilkinson catalyst, and then the allyl methacrylate in the presence of chloroplatinic acid as catalyst for the hydrosilation reaction. The reactivity of these monomers was evaluated by RT-FT-IR finding that the methacrylate groups can be photopolymerized concomitantly with the epoxide groups using only a diaryliodonium salt as photoinitiator, in air-free conditions. The addition of a free radical photoinitiator helps to overcome the oxygen inhibition when the radical photopolymerization is performed in air. The films obtained from these monomers were almost totally crosslinked with T g's of 54 and 31 °C for EM2Si and EM4Si, respectively. It was found that the film made with the monomer with a longer siloxane chain exhibited a higher contact angle as a direct result of the higher hydrophobic surface.
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