Presentation Information
[9a-B12-8]In-Plane Photoreorientation and Anisotropic Proton Conductivity of Liquid Crystalline Copolymers with Proton Conductive Side Chains in Thin Films
〇Oichiro Kumamoto1, Yuya Ishizaki2, Shusaku Nagano1 (1.Rikkyo Univ., 2.Shinshu Univ.)
Keywords:
liquid crystalline polymer,azobenzene,proton conductivity
Liquid crystalline (LC) random copolymers with azobenzene and proton-conductive side chains were synthesized via reversible addition-fragmentation chain transfer polymerization. The proton-conductive LC random copolymer thin films were prepared by spin-casting and annealed above the isotropic temperature. The thin films exhibited homeotropic orientation. We induced random planar orientation of the LC phase with the perpendicular orientation of the proton lamellar nanochannels in the films by adding a small amount of photo-responsive LC block copolymer with low surface free energy blocks, and the in-plane alignment was controlled by subsequent linearly polarized light (LPL) at 430 nm at the LC temperature. Large dichroism was induced for the films at the absorption bands of the mesogenic side chains. Moreover, the photoaligned films exhibited large anisotropic proton conductivity in the parallel direction to the proton nanochannels compared with that of the perpendicular direction.