[24p-F407-1~17] 22.1 Joint Session M "Phonon Engineering"

[24p-F407-14] Investigation of the correlation between covalent/non-covalent interactions and thermal transport properties using polymerizable/depolymerizable single crystals

〇Ryosuke Takehara^1,2, Tomoya Fukui^1,2, Meguya Ryu^2,3, Suguru Kitani¹, Yoshiaki Shoji^1,2, Junko Morikawa^1,2, Kawaji Hitoshi¹, Takanori Fukushima^1,2 (1.Tokyo Tech, 2.CREST-JST, 3.AIST)

Keywords:covalent and non-covalent bonds, thermal conductivity and diffusivity, organic single crystal

To investigate the correlation between covalent/non-covalent interactions and thermal transport properties, we measured the thermophysical properties of a single crystal of BIT-Hep₂ before and after polymerization, which is switchable between the covalently bonded state and the intermolecular force-assembled state of constituent molecules by external stimuli. As a result, thermal conductivity and diffusivity showed a slight change before and after the polymerization, but no drastic change was observed. This result clearly demonstrates that there are important factors determining thermal transport properties other than the presence of covalent bonds.