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Effect of microscopic-ordered structures on intrinsic thermal conductivity of liquid-crystalline polysiloxane

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Abstract

Intrinsic insulating and thermal conductive polymers were prepared by synthesizing liquid-crystalline polysiloxanes elastomer (LCPE) with chemical cross-linking (0.83 W/m K and 0.81 W/m K). The microscopic-ordered structures were found in LCPE and considered affording high thermal conductivity. Chemical structures were observed by hydrogen nuclear magnetic resonance spectroscopy (1H-NMR) and fourier transform infrared (FT-IR) spectroscopy. Microscopic-ordered structures were analyzed by polarizing optical microscopy, scanning electron microscope and X-ray diffraction. Thermal conductivities were calculated according to equation: λ = α·ρ·Cp. Thermal properties were researched by differential scanning calorimeter and thermal gravimetric analyzer. The results revealed that LCPE showed high thermal conductivity because of the microscopic-ordered structures existing. The phonon scattering was suppressed and the mean free path of phonon was extended maximally. In addition, phonon conduction path was more complete. Our study provided a useful method to enhance the thermal conductivities of intrinsic thermal conductivity polymer themselves.

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Acknowledgements

The authors would like to thank the Priority Research and Development Foundations of Shaanxi Provincial Government (Project No. 2018GY-174) and (Project No. 2018GY-115), the Science and Technology activity Foundation for overseas person of Shaanxi Provincial Government (Project No. 2017030) and National Natural Science Foundation of China (Project No. 51577154) for financial support of this work.

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Authors and Affiliations

  1. College of Material Science and Engineering, Xi’an University of Science and Technology, Xi’an, 710054, Shaanxi, China

    Ying Li & Chenggong Li

  2. Department of the Tender and Supply, The First Affiliated Hospital of Xi’an Jiaotong University, Xi’an, 710061, Shaanxi, China

    Liang Zhang

  3. College of Chemistry and Chemical Engineering, Xi’an University of Science and Technology, Xi’an, 710054, Shaanxi, China

    Wenying Zhou

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  1. Ying Li
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Li, Y., Li, C., Zhang, L. et al. Effect of microscopic-ordered structures on intrinsic thermal conductivity of liquid-crystalline polysiloxane. J Mater Sci: Mater Electron 30, 8329–8338 (2019). https://doi.org/10.1007/s10854-019-01150-1

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  • DOI: https://doi.org/10.1007/s10854-019-01150-1

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