Abstract
AbstractWe recently reported a bifunctional methacrylate monomer having a side‐opened cage‐silsesquioxane as a scaffold. Although free‐radical polymerization proceeded mainly through cyclopolymerization, cross‐linking structures were included. In this work, we have optimized the reaction conditions for reversible addition‐fragmentation chain transfer cyclopolymerization using 2‐cyano‐2‐propyl dithiobenzoate. As a result, polymers with relatively low polydispersity indices were successfully obtained. After removal of dithiobenzoate end groups, the transparency was high (>98%) in the range of visible range (400–800 nm). The content of the unreacted dangling vinyl groups, which was controlled by monomer concentration, affected the thermal stability of the resulting polymers. In addition, the bifunctional cage‐silsesquioxane monomer can be readily copolymerized with methyl methacrylate without cross‐linking.
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