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Odarchenko Y, Defaux M, Rosenthal M, Akhkiamova A, Bovsunovskaya P, Melnikov A, Rodygin A, Rychkov A, Gerasimov K, Anokhin DV, Zhu X, Ivanov DA. One Methylene Group in the Side Chain Can Alter by 90 Degrees the Orientation of a Main-Chain Liquid Crystal on a Unidirectional Substrate. ACS Macro Lett 2018; 7:453-458. [PMID: 35619342 DOI: 10.1021/acsmacrolett.8b00044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The mechanisms of orientation of columnar liquid crystals (LCs) on a PTFE-rubbed surface are explored on a homologous series of symmetrically substituted poly(di-n-alkylsiloxanes) (PDAS). It is shown that by increasing the side-chain length in steps of one CH2 group, the orientation of PDAS switches back and forth from perpendicular to parallel with respect to PTFE chains. These changes are sensitive to the smallest possible variation of the macromolecular structure (i.e., modification of the side chain length by just one CH2 group) reflect the alteration of the alignment mechanism identified as graphoepitaxial or epitaxial for the perpendicular and parallel orientation, respectively. The results show that two orthogonal LC orientations are realizable on the same rubbed substrate, which can open new perspectives in the field of organic and printed electronics such as multidomain LCD technology.
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Affiliation(s)
- Yaroslav Odarchenko
- Institut de Sciences des Matériaux de Mulhouse-IS2M, CNRS UMR 7361 Jean Starcky, 15, F-68057 Mulhouse, France
| | - Matthieu Defaux
- Institut de Sciences des Matériaux de Mulhouse-IS2M, CNRS UMR 7361 Jean Starcky, 15, F-68057 Mulhouse, France
| | - Martin Rosenthal
- Institut de Sciences des Matériaux de Mulhouse-IS2M, CNRS UMR 7361 Jean Starcky, 15, F-68057 Mulhouse, France
| | - Azaliia Akhkiamova
- Lomonosov Moscow State University, Faculty of Fundamental Physical and Chemical Engineering, Leninskie Gory 1/51, 119991, Moscow, Russian Federation.,Moscow Institute of Physics and Technology (State University), Institutskiy per. 9, Dolgoprudny, 141700, Russian Federation
| | - Polina Bovsunovskaya
- Lomonosov Moscow State University, Faculty of Fundamental Physical and Chemical Engineering, Leninskie Gory 1/51, 119991, Moscow, Russian Federation.,Moscow Institute of Physics and Technology (State University), Institutskiy per. 9, Dolgoprudny, 141700, Russian Federation
| | - Alexey Melnikov
- Lomonosov Moscow State University, Faculty of Fundamental Physical and Chemical Engineering, Leninskie Gory 1/51, 119991, Moscow, Russian Federation.,Moscow Institute of Physics and Technology (State University), Institutskiy per. 9, Dolgoprudny, 141700, Russian Federation
| | - Alexander Rodygin
- Lomonosov Moscow State University, Faculty of Fundamental Physical and Chemical Engineering, Leninskie Gory 1/51, 119991, Moscow, Russian Federation.,Moscow Institute of Physics and Technology (State University), Institutskiy per. 9, Dolgoprudny, 141700, Russian Federation
| | - Andrey Rychkov
- Lomonosov Moscow State University, Faculty of Fundamental Physical and Chemical Engineering, Leninskie Gory 1/51, 119991, Moscow, Russian Federation.,Moscow Institute of Physics and Technology (State University), Institutskiy per. 9, Dolgoprudny, 141700, Russian Federation
| | - Kirill Gerasimov
- Lomonosov Moscow State University, Faculty of Fundamental Physical and Chemical Engineering, Leninskie Gory 1/51, 119991, Moscow, Russian Federation.,Moscow Institute of Physics and Technology (State University), Institutskiy per. 9, Dolgoprudny, 141700, Russian Federation
| | - Denis V Anokhin
- Lomonosov Moscow State University, Faculty of Fundamental Physical and Chemical Engineering, Leninskie Gory 1/51, 119991, Moscow, Russian Federation.,Moscow Institute of Physics and Technology (State University), Institutskiy per. 9, Dolgoprudny, 141700, Russian Federation.,Institute of Problems of Chemical Physics, Russian Academy of Sciences, Semenov Av. 1, Chernogolovka, Moscow region, 142432, Russian Federation
| | - Xiaomin Zhu
- DWI - Leibniz-Institute for Interactive Materials e.V. and Institute for Technical and Macromolecular Chemistry of RWTH Aachen University, Forkenbeckstr. 50, D-52056 Aachen, Germany
| | - Dimitri A Ivanov
- Institut de Sciences des Matériaux de Mulhouse-IS2M, CNRS UMR 7361 Jean Starcky, 15, F-68057 Mulhouse, France.,Lomonosov Moscow State University, Faculty of Fundamental Physical and Chemical Engineering, Leninskie Gory 1/51, 119991, Moscow, Russian Federation.,Moscow Institute of Physics and Technology (State University), Institutskiy per. 9, Dolgoprudny, 141700, Russian Federation
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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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Shoji Y, Ishige R, Higashihara T, Morikawa J, Hashimoto T, Takahara A, Watanabe J, Ueda M. Cross-Linked Liquid Crystalline Polyimides with Siloxane Units: Their Morphology and Thermal Diffusivity. Macromolecules 2013. [DOI: 10.1021/ma302486s] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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,
Meguro-Ku, Tokyo 152-8550, Japan
| | - Ryohei Ishige
- Institute for Materials Chemistry
and Engineering, Kyushu University, 744
Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Tomoya Higashihara
- Department
of Organic and Polymeric
Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H-120, O-okayama,
Meguro-Ku, Tokyo 152-8550, Japan
- PRESTO, Japan Science and Technology Agency (JST), 4-1-8, Honcho, Kawaguchi,
Saitama 332-0012, Japan
| | - Junko Morikawa
- Department
of Organic and Polymeric
Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H-120, O-okayama,
Meguro-Ku, Tokyo 152-8550, Japan
| | - Toshimasa Hashimoto
- Department
of Organic and Polymeric
Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H-120, O-okayama,
Meguro-Ku, Tokyo 152-8550, Japan
| | - Atsushi Takahara
- Institute for Materials Chemistry
and Engineering, Kyushu University, 744
Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Junji Watanabe
- Department
of Organic and Polymeric
Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H-120, O-okayama,
Meguro-Ku, Tokyo 152-8550, Japan
| | - Mitsuru Ueda
- Department
of Organic and Polymeric
Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 H-120, O-okayama,
Meguro-Ku, Tokyo 152-8550, Japan
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Anokhin DV, Lejnieks J, Mourran A, Zhu X, Keul H, Möller M, Konovalov O, Erina N, Ivanov DA. Interplay between H-bonding and alkyl-chain ordering in self-assembly of monodendritic L-alanine derivatives. Chemphyschem 2012; 13:1470-8. [PMID: 22407506 DOI: 10.1002/cphc.201100739] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 02/01/2012] [Indexed: 11/10/2022]
Abstract
This paper reports on the synthesis and self-organizing properties of monodendrons consisting of L-alanine at the focal point and alkyl chains with different length at the periphery. The structures of thin films and monolayers are studied by temperature-resolved grazing-incidence X-ray diffraction and scanning force microscopy. The interplay between H-bonding and ordering of the alkyl chains results in a rich temperature-dependent phase behavior. The monodendrons form H-bonded stabilized clusters with the number of molecules depending on the length of the aliphatic chains and temperature. The clusters play the role of constitutive units in the subsequent self-assembly. Short alkyl chains allow the material to form thermodynamically stable crystalline phases. The molecules with longer side groups exhibit additional transitions from the crystalline phase to thermotropic columnar hexagonal or columnar rectangular liquid-crystalline phases. In monolayers deposited on highly ordered pyrolytic graphite, the materials show ordering similar to thin films. However, for the compound bearing hexadecyl chains the affinity of the alkyl groups to graphite dominates the self-assembly and thereby allows epitaxial growth of a 2D lattice with flat-on oriented molecules.
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Affiliation(s)
- Denis V Anokhin
- Institut de Sciences des Matériaux de Mulhouse (CNRS IS2M), Mulhouse, France
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Hsiao TJ, Lee JY, Mao YC, Chen YC, Tsai JC, Lin SC, Ho RM. Stereoregular Diblock Copolymers of Syndiotactic Polystyrene Derivatives and Polylactide: Syntheses and Self-Assembled Nanostructures. Macromolecules 2010. [DOI: 10.1021/ma102048v] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ting-Jui Hsiao
- Department of Chemical Engineering, National Chung Cheng University, Chia-Yi 62142, Taiwan
| | - Jing-Yu Lee
- Department of Chemical Engineering, National Chung Cheng University, Chia-Yi 62142, Taiwan
| | - Yung-Cheng Mao
- Department of Chemical Engineering, National Chung Cheng University, Chia-Yi 62142, Taiwan
| | - Yu-Chin Chen
- Department of Chemical Engineering, National Chung Cheng University, Chia-Yi 62142, Taiwan
| | - Jing-Cherng Tsai
- Department of Chemical Engineering, National Chung Cheng University, Chia-Yi 62142, Taiwan
| | - Shih-Chieh Lin
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Rong-Ming Ho
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
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