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Breaking Through Bottlenecks for thermally Conductive Polymer Composites:A Perspective for intrinsic thermal conductivity,Interfacial thermal Resistance and Theoretics

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Nano-Micro Letters 2021年第7期13卷 118-126页

作者： Junwei Gu Kunpeng Ruan MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions Shaanxi Key Laboratory of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’anShaanxi 710072P.R.China

Rapid development of energy,electrical and electronic technologies has put forward higher requirements for the thermal conductivities of polymers and their ***,the thermal conductivity coefficient(λ)values of prepared thermally conductive polymer composites are still difficult to achieve expectations,which has become the bottleneck in the fields of thermally conductive polymer *** at that,based on the accumulation of the previous research works by related researchers and our research group,this paper proposes three possible directions for breaking through the bottlenecks:(1)preparing and synthesizing intrinsically thermally conductive polymers,(2)reducing the interfacial thermal resistance in thermally conductive polymer composites,and(3)establishing suitable thermal conduction models and studying inner thermal conduction mechanism to guide experimental ***,the future development trends of the three above-mentioned directions are foreseen,hoping to provide certain basis and guidance for the preparation,researches and development of thermally conductive polymers and their composites.

关键词： thermally conductive polymer composites intrinsic thermal conductivity Interfacial thermal resistance thermal conduction models thermal conduction mechanisms

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intrinsic high thermal conductive liquid crystal epoxy film simultaneously combining with excellent intrinsic self-healing performance

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Journal of Materials Science & Technology 2021年第9期68卷 209-215页

作者： Xutong Yang Xiao Zhong Junliang Zhang Junwei Gu Research&Development JnsMute of Northwestern Polytechnical University in Shenzhen Guangdong518057China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi'anShaanxi710072China School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang471023China

One kind of side chain liquid crystal epoxy(S-LCE) based on biphenyl mesomorphic unit is synthesized from 2,2-bis(hydroxymethyl)propionic acid,4-phenyl phenol,and *** the intrinsic thermal conductive liquid crystal epoxy film(LCEF) simultaneously combining with intrinsic self-healing performance is then prepared via thiol-epoxide nucleophilic ring-opening reaction and coating method.1 H NMR and FTIR show that S-LCE and LCEF have been successfully prepared.S-LCE presents nematic liquid crystal from room temperature to 160℃.LCEF maintains nematic liquid crystal performance and shows highly intrinsic thermal conductivity & excellent self-healing *** conductivity coefficient(λ)values in vertical direction(λ⊥)and parallel direction(λ‖)of LCEF are 0.33 and 1.25 W/mK,re spectively,much higher than that of general bisphenol A epoxy resin(E-51,λ⊥ of 0.19 W/mK and λ‖ of0.65 W/mK).Tensile strength of LCEF is 10.6 MPa,which can maintain at 90.6 % and 61.3 % after one and four cycles of self-healing behavior,*** addition,LCEF presents a wide service temperature range(-9.8-251℃) and good thermal stability(THRI of 148.5℃).Simultaneously,LCEF has good transparency,flexibility,and tailorability,expected to be utilized in the fields of flexible electronic devices and intelligent structures.

关键词： Liquid crystal epoxy Self-healing performance intrinsic thermal conductivity thermal stability

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Revealing the low thermal conductivity of high-entropy rare-earth tantalates via multi-scale defect analysis

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Journal of Advanced Ceramics 2023年第11期12卷 2087-2100页

作者： Jun Wang Qianqian Jin Jianbo Song Di Zhang Bin Xu Zhiyi Ren Meng Wang Shixiao Yan Xiaoliang Sun Chi Liu Xiaoyu Chong Jing Feng Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Materials Science and Engineering Research Center Guangxi University of Science and TechnologyLiuzhou 545006China Shanghai Electro–Mechanical Engineering Institute Shanghai 201109China Shanghai Spaceflight Precision Machinery Institute Shanghai 201109China

thermal barrier coating(TBC)materials can improve energy conversion efficiency and reduce fossil fuel ***,novel rare earth tantalates RETaO_(4),as promising candidates for TBCs,were reassembled into multi-component solid solutions with a monoclinic structure to further depress thermal conductivity via an entropy *** formation mechanisms of oxygen vacancy defects,dislocations,and ferroelastic domains associated with the thermal conductivity are demonstrated by aberration-corrected scanning transmission electron *** to single-RE RETaO_(4)and 8YSZ,the intrinsic thermal conductivity of(5RE1/5)TaO4 was decreased by 35%–47%and 57%–69%at 1200℃,respectively,which is likely attributed to multi-scale phonon scattering from Umklapp phonon–phonon,point defects,domain structures,and dislocations.r¯3+RE/r5+Ta and low-temperature thermal conductivity are negatively correlated,as are the ratio of elastic modulus to thermal conductivity(E/κ)and high-temperature thermal ***,the high defects’concentration and lattice distortion in high-entropy ceramics enhance the scattering of transverse-wave phonons and reduce the transverse-wave sound velocity,leading to a decrease in the thermal conductivity and Young’s *** addition,5HEC-1 has ultra-low thermal conductivity,moderate thermal expansion coefficients,and high hardness among three five-component high-entropy ***,5HEC-1 with superior thermal barrier and mechanical properties can be used as promising thermal insulating materials.

关键词： thermal barrier coating(TBC) entropy strategy oxygen vacancy dislocation ferroelastic domains intrinsic thermal conductivity

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