Presentation Information
[9a-S103-5]Mesogenic Orientation and Thermal Diffusivity of Side-Chain Liquid Crystalline Polymers with Smectic Phases in Thin Films
〇(M2)Kanna Kobayashi1, Yuya Ishizaki1, Seki Takahiro2, Nagano Shusaku1 (1.Rikkyo Univ., 2.Nagoya Univ.)
Keywords:
Thermal diffusivity,Mesogenic orientation,Polymer
Liquid crystalline (LC) polymers have attracted attention as thermal management materials because of their highly ordered structures and optically large LC domains. In the present study, we investigated the relation between the LC orientation and thermal diffusivity in thin films with Sm phases. A side-chain liquid crystalline (SCLC) azobenzene polymer exhibiting smectic (Sm) A phases was synthesized by reversible addition-fragmentation chain transfer polymerization . We evaluated thermal diffusivity in the through-plane direction of the SCLC polymer thin films with the thickness ranging from 1.1 to 1.7 µm. The LC orientation was analyzed by grazing incidence X-ray scattering. The thermal diffusivity in thin films with homeotropic orientation was higher than that with planar orientation. This indicates that SmA polymers with planar orientation in thin films suppress the phonon diffusion in the through-plane direction owing to the low molecular order within the SmA lamellar layer. Moreover, we discussed the relation between the LC orientation and thermal diffusivity for thin films with the other Sm phases.