Electric-field-aligned liquid crystal polymer for doubling anisotropic thermal conductivity

Electric-field-aligned liquid crystal polymer for doubling anisotropic thermal conductivity

2024 | Maohua Li, Ping Gong, Zhenbang Zhang, Linhong Li, Yapeng Chen, Yue Qin, Yingying Guo, Rongjie Yang, Jianxiang Zhang, Yiwei Zhou, Kang Xu, Yandong Wang, Hainam Do, Xiaofei Jia, Tao Cai, Cheng-Te Lin, Nan Jiang, Jinhong Yu
This study presents a method to enhance the thermal conductivity of liquid crystal polymers (LCPs) by aligning the molecular directionality using an external electric field. The researchers synthesized a liquid crystal monomer, PBPE-C3-AA, which was then polymerized into an LCP with a high intrinsic thermal conductivity of 1.02 W m⁻¹ K⁻¹. The alignment of the molecular chains was confirmed through various techniques, including polarized Raman spectroscopy, X-ray diffraction (XRD), and small-angle X-ray scattering (SAXS). The thermal conductivity of the aligned LCP was significantly higher than that of the disordered sample, reaching 1.02 W m⁻¹ K⁻¹, compared to 0.45 W m⁻¹ K⁻¹ for the disordered sample. The study also explored the electrical properties of the LCP, showing excellent electrical stability and dielectric behavior. This work demonstrates the potential of using electric fields to control the alignment of liquid crystal polymers, opening new possibilities for their application in thermal management materials.This study presents a method to enhance the thermal conductivity of liquid crystal polymers (LCPs) by aligning the molecular directionality using an external electric field. The researchers synthesized a liquid crystal monomer, PBPE-C3-AA, which was then polymerized into an LCP with a high intrinsic thermal conductivity of 1.02 W m⁻¹ K⁻¹. The alignment of the molecular chains was confirmed through various techniques, including polarized Raman spectroscopy, X-ray diffraction (XRD), and small-angle X-ray scattering (SAXS). The thermal conductivity of the aligned LCP was significantly higher than that of the disordered sample, reaching 1.02 W m⁻¹ K⁻¹, compared to 0.45 W m⁻¹ K⁻¹ for the disordered sample. The study also explored the electrical properties of the LCP, showing excellent electrical stability and dielectric behavior. This work demonstrates the potential of using electric fields to control the alignment of liquid crystal polymers, opening new possibilities for their application in thermal management materials.
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[slides and audio] Electric-field-aligned liquid crystal polymer for doubling anisotropic thermal conductivity