| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| 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
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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 |
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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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Published: 26 April 2020
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51903207), Priority Research and Development Foundations of Shaanxi Provincial Government (2018GY-115, 2018GY-174), the Science and Technology Activity Foundation for Overseas Person of Shaanxi Provincial Go-vernment (2017030). |
Corresponding Authors:
Qinghao Yangreceived his Ph.D. degree in material science and engineering from Xi'an Jiaotong University in 2009. He is currently an associate professor and master tutor in Xi'an University of Science and Technology. He is the special researcher in applied chemistry in Osaka University. His research interests are functional polymer Composites and conductive polymers.
Liang Zhangreceived his master degree in materials engineering from Xi'an University of Science and Technology. He is currently an associate senior technician in the First Affiliated Hospital of Xi'an Jiaotong University. His research interests are functional polymer, medical & industrial materials and material test method.
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| About author:: Ying Lireceived her Ph.D. degree in materials scie-nce from Northwestern Polytechnical University in 2012. She is currently an associate professor and master tutor in Xi'an University of Science and Technology. She is the visiting scholar in California State University (2015—2016). Her research interests are thermal conductivity polymers and liquid crystalline polymers. |
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2020, Vol. 34 
