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Wu Z, Dong J, Guo H, Shang R, Qin X, Xia Y, Li X, Zhao X, Ji C, Zhang Q. Robust, Self-Healing, and Multi-Use Poly(Urethane-Urea-Imide) Elastomer as a Durable Adhesive for Thermal Interface Materials. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2401815. [PMID: 38573922 DOI: 10.1002/smll.202401815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2024] [Revised: 03/20/2024] [Indexed: 04/06/2024]
Abstract
Currently, research on thermal interface materials (TIMs) is primarily focused on enhancing thermal conductivity. However, strong adhesion and multifunctionality are also important characteristics for TIMs when pursing more stable interface heat conduction. Herein, a novel poly(urethane-urea-imide) (PUUI) elastomer containing abundant dynamic hydrogen bonds network and reversible disulfide linkages is successfully synthesized for application as a TIM matrix. The PUUI can self-adapt to the metal substrate surface at moderate temperatures (80 °C) and demonstrates a high adhesion strength of up to 7.39 MPa on aluminum substrates attributed its noncovalent interactions and strong intrinsic cohesion. Additionally, the PUUI displays efficient self-healing capability, which can restore 94% of its original mechanical properties after self-healing for 6 h at room temperature. Furthermore, PUUI composited with aluminum nitride and liquid metal hybrid fillers demonstrates a high thermal conductivity of 3.87 W m-1 K-1 while maintaining remarkable self-healing capability and adhesion. When used as an adhesive-type TIM, it achieves a low thermal contact resistance of 22.1 mm2 K W-1 at zero pressure, only 16.7% of that of commercial thermal pads. This study is expected to break the current research paradigm of TIMs and offers new insights for the development of advanced, reliable, and sustainable TIMs.
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Affiliation(s)
- Zhiqiang Wu
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Jie Dong
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Han Guo
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Rui Shang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Xiuzhi Qin
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Yanfei Xia
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Xiuting Li
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Xin Zhao
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Chengchang Ji
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
| | - Qinghua Zhang
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China
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2
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Ruan K, Gu J. Ordered Alignment of Liquid Crystalline Graphene Fluoride for Significantly Enhancing Thermal Conductivities of Liquid Crystalline Polyimide Composite Films. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00491] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Kunpeng Ruan
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, Guangdong 518057, P. R. China
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, P. R. China
| | - Junwei Gu
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen, Guangdong 518057, P. R. China
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, P. R. China
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3
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Okamoto S, Sudo A, Endo T. Molecular design and synthesis of crosslinked polyimides using radical isomerization of vinylcyclopropane with thiols. J Appl Polym Sci 2021. [DOI: 10.1002/app.50529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shusuke Okamoto
- Molecular Engineering Institute Kyushu Institute of Technology Fukuoka Japan
| | - Atsushi Sudo
- Department of Applied Chemistry, Faculty of Science and Engineering Kindai University Osaka Japan
| | - Takeshi Endo
- Molecular Engineering Institute Kyushu Institute of Technology Fukuoka Japan
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4
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Ishige R, Song CL, Hara S, Ando S, Kazarian SG. Analysis of spatial orientation distribution of highly oriented polyimide film using micro ATR-FTIR spectroscopic imaging method. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123616] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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5
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Thermally conductive molecular assembly composed of an oligo(ethylene glycol)-modified filamentous virus with improved solubility and resistance to organic solvents. Polym J 2020. [DOI: 10.1038/s41428-020-0328-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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6
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Sasaki R, Takahashi Y, Hayashi Y, Kawauchi S. Atomistic Mechanism of Anisotropic Heat Conduction in the Liquid Crystal 4-Heptyl-4'-cyanobiphenyl: All-Atom Molecular Dynamics. J Phys Chem B 2020; 124:881-889. [PMID: 31880459 DOI: 10.1021/acs.jpcb.9b08158] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
All-atom molecular dynamics simulations were performed on 4-heptyl-4'-cyanobiphenyl (7CB) to study the mechanism of heat conduction in this nematic liquid crystal atomistically. To describe 7CB properly, the AMBER-type force field was optimized for the dihedral parameter of biphenyl and the Lennard-Jones parameters. The molecular dynamics calculation using the optimized force field well reproduced the experimental values of the isotropic-nematic phase transition temperature, density, and anisotropy of the thermal conductivity. Furthermore, the contributions of convection, intramolecular interaction, and intermolecular interaction to the thermal conductivity were determined by performing thermal conductivity decomposition analysis. According to the analysis, the contributions of convection, bond stretching, and bond bending interactions were higher in the direction parallel to the nematic director than that perpendicular to the director, which is the origin of the anisotropy in the nematic phase. This result indicates that the anisotropy is caused by well-aligned covalent bonds and high mobility parallel to the director. This quantitative description of the mechanism of heat conduction of 7CB is foreseen to provide new insights toward designing highly thermally conductive liquid-crystalline materials.
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Affiliation(s)
- Ryoma Sasaki
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology , Tokyo Institute of Technology , 2-12-1-E4-6 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan.,Tokyo Tech Academy for Convergence of Materials and Informatics (TAC-MI) , Tokyo Institute of Technology , 2-12-1 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan
| | - Yuki Takahashi
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology , Tokyo Institute of Technology , 2-12-1-E4-6 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan
| | - Yoshihiro Hayashi
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology , Tokyo Institute of Technology , 2-12-1-E4-6 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan.,Research Institute of Polymer Science and Technology (RIPST) , Tokyo Institute of Technology , 2-12-1 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan
| | - Susumu Kawauchi
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology , Tokyo Institute of Technology , 2-12-1-E4-6 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan.,Tokyo Tech Academy for Convergence of Materials and Informatics (TAC-MI) , Tokyo Institute of Technology , 2-12-1 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan.,Research Institute of Polymer Science and Technology (RIPST) , Tokyo Institute of Technology , 2-12-1 Ookayama , Meguro-ku, Tokyo 152-8552 , Japan
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7
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Tanaka K, Ando S, Ishige R. Spontaneous Chain Orientation of Aromatic Polyimides Evolved during Thermal Imidization from Shear-Oriented Glassy Liquid Crystalline Precursors. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00953] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kazuyuki Tanaka
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, E4-5, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Shinji Ando
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, E4-5, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Ryohei Ishige
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, E4-5, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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8
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Kamitani K, Hamada A, Yokomachi K, Ninomiya K, Uno K, Mukai M, Konishi Y, Ohta N, Nishibori M, Hirai T, Takahara A. Depth-Resolved Characterization of Perylenediimide Side-Chain Polymer Thin Film Structure Using Grazing-Incidence Wide-Angle X-ray Diffraction with Tender X-rays. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:8516-8521. [PMID: 29950098 DOI: 10.1021/acs.langmuir.8b01566] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Polymers with a perylenediimide (PDI) side chain (PAc12PDI) consist of two kinds of crystalline structures with various types of orientations in a thin film. Understanding the population of the microcrystalline structure and its orientation along the thickness is strongly desired. Grazing-incidence wide-angle X-ray diffraction (GIWAXD) measurements with hard X-rays, which are generally chosen as λ = 0.1 nm, are a powerful tool to evaluate the molecular aggregation structure in thin films. A depth-resolved analysis for the outermost surface of the polymeric materials using conventional GIWAXD measurements, however, has limitations on depth resolution because the X-ray penetration depth dramatically increases above the critical angle. Meanwhile, tender X-rays (λ = 0.5 nm) have the potential advantage that the penetration depth gradually increases above the critical angle, leading to precise characterization for the population of crystallite distribution along the thickness. The population of the microcrystalline states in the PAc12PDI thin film was precisely characterized utilizing GIWAXD measurements using tender X-rays. The outermost surface of the PAc12PDI thin film is occupied by a monoclinic lattice with a = 2.38 nm, b = 0.74 nm, c = 5.98 nm, and β = 108.13°, while maintaining the c-axis perpendicular to the substrate surface. Additionally, the presence of solid substrate controls the formation of the crystallite with unidirectional orientation.
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Affiliation(s)
| | | | | | | | | | | | | | - Noboru Ohta
- Japan Synchrotron Radiation Research Institute/SPring-8 , Sayo , Hyogo 679-5198 , Japan
| | - Maiko Nishibori
- Research Center for Synchrotron Light Applications , Kyushu University , 6-1 Kasugakoen , Kasuga , Fukuoka 816-8580 , Japan
| | | | - Atsushi Takahara
- Research Center for Synchrotron Light Applications , Kyushu University , 6-1 Kasugakoen , Kasuga , Fukuoka 816-8580 , Japan
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10
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Sawada T, Murata Y, Marubayashi H, Nojima S, Morikawa J, Serizawa T. Filamentous Virus-based Assembly: Their Oriented Structures and Thermal Diffusivity. Sci Rep 2018; 8:5412. [PMID: 29615694 PMCID: PMC5883014 DOI: 10.1038/s41598-018-23102-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2017] [Accepted: 03/01/2018] [Indexed: 12/27/2022] Open
Abstract
Organic polymers are generally regarded as thermal insulators because amorphous arrangement of molecular chains reduces the mean free path of heat-conducting phonons. However, recent studies indicated that single chains of polymers with highly oriented structures could have high thermal conductivity than bulk polymers because stretched polymer chains effectively conduct phonons through polymeric covalent bonds. Here, we demonstrated the possibility of non-covalent virus assembly prepared by simple flow-induced methods toward high thermal conductive polymeric materials. Films with high thermal diffusivity composed of non-covalent bond-based assemblies of liquid crystalline filamentous viruses were prepared using a simple flow-induced orientation method. Structural and thermal characterization demonstrated that highly oriented structures of the viruses in the film were attributed to the high thermal diffusivity. Our results will open attractive opportunities for biomolecular-based thermally conductive soft materials even though the assemblies are based on non-covalent bonds.
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Affiliation(s)
- Toshiki Sawada
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan. .,Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawacughi-shi, Saitama, 332-0012, Japan.
| | - Yuta Murata
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Hironori Marubayashi
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Shuichi Nojima
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Junko Morikawa
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Takeshi Serizawa
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan.
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11
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Ge SJ, Zhao TP, Wang M, Deng LL, Lin BP, Zhang XQ, Sun Y, Yang H, Chen EQ. A homeotropic main-chain tolane-type liquid crystal elastomer film exhibiting high anisotropic thermal conductivity. SOFT MATTER 2017; 13:5463-5468. [PMID: 28726970 DOI: 10.1039/c7sm01154g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The development of pure polymeric films with anisotropic thermal conductivities for electronic device packaging applications has attracted intense scientific attention. In order to enhance the polymeric film's normal-direction thermal conductivity, homeotropic alignment of macromolecular chains is the primary concern. One of the promising preparation strategies is to perform in situ photopolymerization of homeotropic-oriented liquid crystal monomers. In this work, we design and synthesize a novel tolane-core thiol-ene-tailed liquid crystal monomer. Benefitting from the conjugated and extended tolane π-system of the mesogenic core and length extension of the terminal aliphatic tails, the normal-to-plane thermal conductivity value and the thermal conductivity anisotropy value of the corresponding cross-linked main-chain end-on liquid crystal polymer (xMELCP) film reach 3.56 W m-1 K-1 and 15.0, respectively. Compared with the data of a previously reported ester-type thiol-ene xMELCP film, the two primary values of this novel tolane-type thiol-ene xMELCP material are increased dramatically by 46% and 29%, respectively.
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Affiliation(s)
- Si-Jia Ge
- School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory for Science and Application of Molecular Ferroelectrics, Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Southeast University, Nanjing, 211189, P. R. China.
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12
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Pichaimani P, Krishnan S, Song JK, Muthukaruppan A. Bio-silicon reinforced siloxane core polyimide green nanocomposite with multifunctional behavior. HIGH PERFORM POLYM 2017. [DOI: 10.1177/0954008317709891] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Prabunathan Pichaimani
- Department of Handloom and Textile Technology, Indian Institute of Handloom Technology, Salem, Tamil Nadu, India
- Display Devices and Materials Lab, School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea
| | - Srinivasan Krishnan
- Centre of Excellence for Advanced Material Manufacturing, Processing and Characterization (CoExAMMPC), VFSTR University, Vadlamudi, Guntur, India
| | - Jang-Kun Song
- Display Devices and Materials Lab, School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, Republic of Korea
| | - Alagar Muthukaruppan
- Centre of Excellence for Advanced Material Manufacturing, Processing and Characterization (CoExAMMPC), VFSTR University, Vadlamudi, Guntur, India
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13
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Kido M, Nojima S, Ishige R, White KL, Kamitani K, Ohta N, Hirai T, Takahara A. Effect of molecular weight on microcrystalline structure formation in polymer with perylenediimide side chain. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/polb.24115] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Makoto Kido
- Graduate School of Engineering; Kyushu University; 744 Motooka, Nishi-Ku Fukuoka 819-0395 Japan
| | - Shiki Nojima
- Graduate School of Engineering; Kyushu University; 744 Motooka, Nishi-Ku Fukuoka 819-0395 Japan
| | - Ryohei Ishige
- Institute for Materials Chemistry and Engineering, Kyushu University; 744 Motooka, Nishi-Ku, Fukuoka, 819-0395, Japan
| | - Kevin L. White
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University; 744 Motooka, Nishi-Ku Fukuoka 819-0395 Japan
| | - Kazutaka Kamitani
- Institute for Materials Chemistry and Engineering, Kyushu University; 744 Motooka, Nishi-Ku, Fukuoka, 819-0395, Japan
| | - Noboru Ohta
- Japan Synchrotron Radiation Research Institute/SPring-8; Sayo Hyogo 679-5198 Japan
| | - Tomoyasu Hirai
- Graduate School of Engineering; Kyushu University; 744 Motooka, Nishi-Ku Fukuoka 819-0395 Japan
- Institute for Materials Chemistry and Engineering, Kyushu University; 744 Motooka, Nishi-Ku, Fukuoka, 819-0395, Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University; 744 Motooka, Nishi-Ku Fukuoka 819-0395 Japan
| | - Atsushi Takahara
- Graduate School of Engineering; Kyushu University; 744 Motooka, Nishi-Ku Fukuoka 819-0395 Japan
- Institute for Materials Chemistry and Engineering, Kyushu University; 744 Motooka, Nishi-Ku, Fukuoka, 819-0395, Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University; 744 Motooka, Nishi-Ku Fukuoka 819-0395 Japan
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Wang M, Wang J, Yang H, Lin BP, Chen EQ, Keller P, Zhang XQ, Sun Y. Homeotropically-aligned main-chain and side-on liquid crystalline elastomer films with high anisotropic thermal conductivities. Chem Commun (Camb) 2016; 52:4313-6. [DOI: 10.1039/c6cc00081a] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Homeotropically-aligned main-chain and side-on liquid3crystalline elastomer films are reported. Their thermal conductivities in the normal direction are both dramatically higher than those along the horizontal direction.
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Affiliation(s)
- Meng Wang
- School of Chemistry and Chemical Engineering
- Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research
- Jiangsu Optoelectronic Functional Materials and Engineering Laboratory
- Southeast University
- Nanjing
| | - Jun Wang
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Polymer Chemistry and Physics at the Ministry of Education
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Hong Yang
- School of Chemistry and Chemical Engineering
- Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research
- Jiangsu Optoelectronic Functional Materials and Engineering Laboratory
- Southeast University
- Nanjing
| | - Bao-Ping Lin
- School of Chemistry and Chemical Engineering
- Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research
- Jiangsu Optoelectronic Functional Materials and Engineering Laboratory
- Southeast University
- Nanjing
| | - Er-Qiang Chen
- Beijing National Laboratory for Molecular Sciences
- Key Laboratory of Polymer Chemistry and Physics at the Ministry of Education
- College of Chemistry and Molecular Engineering
- Peking University
- Beijing 100871
| | - Patrick Keller
- Institut Curie
- Centre De Recherche
- CNRS UMR 168
- Université Pierre et Marie Curie
- 26 rue d'Ulm 75248 Paris Cedex 05
| | - Xue-Qin Zhang
- School of Chemistry and Chemical Engineering
- Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research
- Jiangsu Optoelectronic Functional Materials and Engineering Laboratory
- Southeast University
- Nanjing
| | - Ying Sun
- School of Chemistry and Chemical Engineering
- Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research
- Jiangsu Optoelectronic Functional Materials and Engineering Laboratory
- Southeast University
- Nanjing
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15
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Zhuo L, Kou K, Wang Y, Chen H. Synthesis and characterization of pyrimidine-containing hyperbranched polyimides. Des Monomers Polym 2014. [DOI: 10.1080/15685551.2014.947552] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
Affiliation(s)
- Longhai Zhuo
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
| | - Kaichang Kou
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
| | - Yiqun Wang
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
| | - Hong Chen
- Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Science, Northwestern Polytechnical University, Xi’an 710072, China
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16
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Ishige R, Shinohara T, White KL, Meskini A, Raihane M, Takahara A, Ameduri B. Unique Difference in Transition Temperature of Two Similar Fluorinated Side Chain Polymers Forming Hexatic Smectic Phase: Poly{2-(perfluorooctyl)ethyl acrylate} and Poly{2-(perfluorooctyl)ethyl vinyl ether}. Macromolecules 2014. [DOI: 10.1021/ma500503z] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
| | | | | | - Ahmed Meskini
- Organometallic and Macromolecular Chemistry-Composite
Materials Laboratory − Cadi Ayyad University-Faculté des Sciences et Techniques, Avenue Abdelkrim Khattabi, BP 549, 40000 Marrakech, Morocco
| | - Mustapha Raihane
- Organometallic and Macromolecular Chemistry-Composite
Materials Laboratory − Cadi Ayyad University-Faculté des Sciences et Techniques, Avenue Abdelkrim Khattabi, BP 549, 40000 Marrakech, Morocco
| | - Atsushi Takahara
- Exploratory Research for Advanced Technology
(ERATO), Takahara Soft Interfaces Project, Japan Science and Technology Agency (JST), 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Bruno Ameduri
- Engineering
and Macromolecular Architectures, Institut Charles Gerhardt, UMR (CNRS)
5253, Ecole Nationale Supérieure de Chimie de Montpellier, 8 Rue Ecole Normale, 34296 Montpellier Cedex 5, France
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Shoji Y, Higashihara T, Tokita M, Morikawa J, Watanabe J, Ueda M. Thermal diffusivity of hexagonal boron nitride composites based on cross-linked liquid crystalline polyimides. ACS APPLIED MATERIALS & INTERFACES 2013; 5:3417-3423. [PMID: 23506319 DOI: 10.1021/am400460p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Hexagonal boron nitride (h-BN) composites with the oriented cross-linked liquid crystalline (LC) polyimide have been developed as high thermally conductive materials. Well-dispersed h-BN composite films were obtained, as observed by scanning electron microscopy. The morphology of the composite films was further investigated in detail by the wide-angle X-ray diffraction. The obtained composite films based on the cross-linked LC polyimide showed that the polymer chains vertically aligned in the direction parallel to the films, while those based on the amorphous polyimide showed an isotropic nature. Moreover, the alignment of the cross-linked LC polyimides was maintained, even after increasing the volume fraction of h-BN. This alignment plays an important role in the effective phonon conduction between h-BN and the matrices. Indeed, the thermal diffusivity in the thickness direction of the composite films based on the LC polyimide measured by a temperature wave analysis method was increased to 0.679 mm(2) s(-1) at a 30 vol % h-BN loading, which was higher than that based on the amorphous polyimide.
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Affiliation(s)
- Yu Shoji
- Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H-120, O-okayama, Tokyo 152-8550, Japan
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