Preparation of Liquid Crystalline Polymer with Intrinsic Thermal Conductivity and Establishment of Thermal Conductivity Model:a Method of Increasing Polymer Matrix Thermal Conductivity
LI Ying1, LI Chenggong1, HOU Zhenzhong1, ZHANG Liang2, YANG Qinghao1, LIU Xinyi1
1 College of Material Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China 2 Department of the Tender and Supply, the First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China
Abstract: Liquid crystalline polymers (LCPs) containing rigid mesogenic monomer were synthesized. The ordered arrangement of molecular chain in LCP were increased via integrated networks of polymers and spontaneously ordered arrangement of mesogenic monomers. The phonon transmission interflow net based on microscopic-ordered structure was built and the high thermal conductivity of polymer matrix was ensured. Chemical structures were characterized by Fourier transform infrared (FTIR). Liquid crystalline properties were analyzed by polarizing optical microscope (POM) and differential scanning calorimetry (DSC). Microstructures were observed by scanning electron microscopy (SEM). Thermal conductivities were researched by thermogravimetric analysis (TGA). And the thermal conductivities of LCPs films were tested as following: λ=α·ρ·Cp. The results indicated that: LCP1 and LCP2 both exhibited microscopic-ordered structures and possessed high thermal conductivities, 0.79 W/(m·K) and 0.72 W/(m·K) respectively. The thermal conductivity increased with the increasing of mesogenic monomer content grafted into PMHS. In addition, LCP1 and LCP2 showed high thermal stabilities, the highest melting temperature (Tm) and 5% weight loss temperature (Td(5wt%)) reaches 230 ℃ and 420.36 ℃ respectively. Results enrich the research foundation of intrinsic thermal conductivity liquid crystalline polymers and expand the application of liquid crystalline polymers.
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2020, Vol. 34 
