Polystyrene-polysiloxane Diblock Copolymer having Liquid Crystalline Side Chains

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The polystyrene-b-poly(vinyl methylsiloxane) (PS-b-PVMS) main chain was synthesized via the anionic polymerization of styrene and cyclotrisioxane momomer consecutively. The catalytic hydrosililation of vinyl groups with the hydrodisiloxane tethered by liquid crystalline stilbene mesogen unit afforded a diblock copolymer PS-b-PMS(Stb) with the narrow polydispersity (M_N = 52100, M_W/M_N = 1.25). This diblock copolymer exhibited liquid crystalline phase, and gave a lamellae-like nanostructure in the thin film thermally annealed at higher temperature than the isotropic-to-LC transition point.