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Yan H, He Y, Yao L, Wang X, Zhang X, Zhang Y, Han D, Li C, Sun L, Zhang J. Thermo-crosslinking assisted preparation of thiol-acrylate main-chain liquid-crystalline elastomers. JOURNAL OF POLYMER RESEARCH 2022. [DOI: 10.1007/s10965-022-03238-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Hong HJ, Park SY. Effects of network structure of main-chain liquid crystal elastomer on its thermal actuation performance. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.03.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Liu S, Li Q, Hua L, Zhao Z, Ren Z, Yan S. Thermally Activated Delayed Fluorescence Polysiloxanes with Short Delay Fluorescence Lifetimes. Macromol Rapid Commun 2022; 43:e2200064. [PMID: 35218087 DOI: 10.1002/marc.202200064] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 02/18/2022] [Indexed: 11/10/2022]
Abstract
Blue-emitting thermally activated delayed fluorescence (TADF) polymers are still in demand for high-efficiency display materials. Through-space charge transfer (TSCT) strategy is promising for keeping color purity of blue-emitting polymers with non-conjugated main chains. It is, however, hard to synthesize copolymers with well-dispersed donors or acceptors utilizing traditional polyethylene backbones via radical polymerization. Herein, two series of blue-emiting polysiloxane with TADF properties, random and order-controlled copolysiloxanes, were succsuccfully designed and synthesized and their photophysical properties were investigated and compared in detail. All of them display short prompt and delay fluorescence lifetimes, very fast reverse intersystem crossing (RISC) rate of 107 s-1 . Compared with random copolysiloxanes, acceptors are well seperated by donors for order-controlled copolysiloxanes, whcih exhibit the faster RISC processes and the higher photoluminescence quantum yield. Therefore, the order-controlled architecture provides a guide for improving light-emitting efficiency of TSCT-type TADF polymers. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Silu Liu
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Quanwei Li
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Lei Hua
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Zhennan Zhao
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Zhongjie Ren
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Shouke Yan
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.,Key Laboratory of Rubber-Plastics, Ministry of Education, Qingdao University of Science & Technology, Qingdao, 266042, P. R. China
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Liquid Crystal-Based Organosilicone Elastomers with Supreme Mechanical Adaptability. Polymers (Basel) 2022; 14:polym14040789. [PMID: 35215702 PMCID: PMC8880581 DOI: 10.3390/polym14040789] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 01/30/2022] [Accepted: 02/03/2022] [Indexed: 02/04/2023] Open
Abstract
Elastomers with supreme mechanical adaptability where the increasing stress under continuous deformation is significantly inhibited within a large deformation zone, are highly desired in many areas, such as artificial muscles, flexible and wearable electronics, and soft artificial-intelligence robots. Such system comprises the advantages of recoverable elasticity and internal compensation to external mechanical work. To obtain elastomer with supreme mechanical adaptability, a novel liquid crystal-based organosilicon elastomer (LCMQ) is developed in this work, which takes the advantages of reversible strain-induced phase transition of liquid crystal units in polymer matrix and the recoverable nano-sized fillers. The former is responsible for the inhibition of stress increasing during deformation, where the external work is mostly compensated by internal phase transition, and the latter provides tunable and sufficient high tensile strength. Such LCMQs were synthesized with 4-methoxyphenyl 4-(but-3-en-1-yloxy)benzoate (MBB) grafted thiol silicone oil (crosslinker-g-MBB) as crosslinking agent, vinyl terminated polydimethylsiloxane as base adhesive, and fumed silica as reinforcing filler by two-step thiol-ene “click” reaction. The obtained tensile strength and the elongation at break are better than previously reported values. Moreover, the resulting liquid crystal elastomers exhibit different mechanical behavior from conventional silicone rubbers. When the liquid crystal content increases from 1% (w/w) to 4% (w/w), the stress plateau for mechanical adaptability becomes clearer. Moreover, the liquid crystal elastomer has no obvious deformation from 25 °C to 120 °C and is expected to be used in industrial applications. It also provides a new template for the modification of organosilicon elastomers.
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Li Y, Keum JK, Wang J, Jiang N, Bras W, Kessler MR, Rios O. Multiscale Structural Characterization of a Smectic Liquid Crystalline Elastomer upon Mechanical Deformation Using Neutron Scattering. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yuzhan Li
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Jong K. Keum
- Center for Nanophase Materials Sciences and Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Jun Wang
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Naisheng Jiang
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Wim Bras
- Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Michael R. Kessler
- Department of Mechanical Engineering, North Dakota State University, Fargo, North Dakota 58108, United States
| | - Orlando Rios
- Department of Materials Science and Engineering, The University of Tennessee, Knoxville, Tennessee 37996, United States
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Cho EH, Luu K, Park SY. Mechano-Actuated Light-Responsive Main-Chain Liquid Crystal Elastomers. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00088] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eun-hye Cho
- School of Applied Chemical Engineering, Polymeric Nanomaterials Laboratory, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Khuong Luu
- School of Applied Chemical Engineering, Polymeric Nanomaterials Laboratory, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Soo-young Park
- School of Applied Chemical Engineering, Polymeric Nanomaterials Laboratory, Kyungpook National University, Daegu 41566, Republic of Korea
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Wang X, Zhao N, Qin B, Xu J, Yang W, Li C, Sun L, Zhang J. Ultrasonics Sonochemistry Assisted Preparation of Polysiloxane Main‐Chain Liquid‐Crystalline Elastomers. MACROMOL CHEM PHYS 2020. [DOI: 10.1002/macp.202000071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Xiuxiu Wang
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang University Harbin 150080 China
- Key Laboratory of Chemical Engineering Process and Technology for High‐Efficiency Conversion, School of Chemistry and Material ScienceHeilongjiang University Harbin 150080 China
| | - Nan Zhao
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang University Harbin 150080 China
| | - Ban Qin
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang University Harbin 150080 China
| | - Jiaojiao Xu
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang University Harbin 150080 China
| | - Wenlong Yang
- Department of Applied ScienceHarbin University of Science and Technology Harbin 150080 China
| | - Chensha Li
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang University Harbin 150080 China
| | - Liguo Sun
- Key Laboratory of Chemical Engineering Process and Technology for High‐Efficiency Conversion, School of Chemistry and Material ScienceHeilongjiang University Harbin 150080 China
| | - Jianqi Zhang
- Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and Technology Beijing 100190 China
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Pan L, Ban J, Ren L, Zhang Z, Peng Q, Lu S. The influence of liquid crystals on the properties of sisal fibre polyurethanes with multi-shape memory effects. NEW J CHEM 2019. [DOI: 10.1039/c8nj05791e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
LC-SF-SMPUs show excellent multi-shape memory properties.
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Affiliation(s)
- Lulu Pan
- Key Laboratory of New Processing Technology for Nonferrous Metals and Materials
- Ministry of Education
- School of Material Science and Engineering
- Guilin University of Technology
- Guilin
| | - Jianfeng Ban
- College of Chemical Engineering
- Guangdong University of Petrochemical Technology
- Maoming
- China
| | - Li Ren
- Key Laboratory of New Processing Technology for Nonferrous Metals and Materials
- Ministry of Education
- School of Material Science and Engineering
- Guilin University of Technology
- Guilin
| | - Zuocai Zhang
- Key Laboratory of New Processing Technology for Nonferrous Metals and Materials
- Ministry of Education
- School of Material Science and Engineering
- Guilin University of Technology
- Guilin
| | - Qingyuan Peng
- Key Laboratory of New Processing Technology for Nonferrous Metals and Materials
- Ministry of Education
- School of Material Science and Engineering
- Guilin University of Technology
- Guilin
| | - Shaorong Lu
- Key Laboratory of New Processing Technology for Nonferrous Metals and Materials
- Ministry of Education
- School of Material Science and Engineering
- Guilin University of Technology
- Guilin
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Rogez D, Krause S, Martinoty P. Main-chain liquid-crystal elastomers versus side-chain liquid-crystal elastomers: similarities and differences in their mechanical properties. SOFT MATTER 2018; 14:6449-6462. [PMID: 30035290 DOI: 10.1039/c8sm00936h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
After a general introduction on the main aspects of the mechanical properties of main-chain liquid-crystal elastomers (MCLCEs) and side-chain liquid-crystal elastomers (SCLCEs), new results will be presented dealing with several MCLCEs with a cross-linker density C = 8%, 6% and 4% and with a SCLCE with C = 10%, all prepared by the two-step cross-linking process. A non-SCLCE with bulky side-groups similar in shape to the mesogens was also synthesized for comparison with the SCLCE. Most of the experiments were performed with a piezorheometer allowing the determination of the shear anisotropy of the samples by applying shear in a direction parallel or perpendicular to the director, and with a thermo-elastic device for the E measurements. The main results concern: (a) the influence of the supercritical nature of SCLCE and the subcritical nature of MCLCEs on the mechanical properties of these elastomers, as well as that of SmC domains present in MCLCEs; (b) the relationship between the degrees of elongation and of anisotropy deduced from the variations of and during the poly-domain to mono-domain transition of the 10% SCLCE and the 8% MCLCE; (c) the determination of the Poisson's ratio showing that it is isotropic for the non-SCLCE, with a crossover between 0.5 (classical value for rubbers) for small strains and 0.38 for high strains, and anisotropic for the 10% SCLCE and 8% MCLCE, with values <0.5. The particular behaviors of the Poisson's ratios can be explained by confinement effects occurring when stretching increases.
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Affiliation(s)
- D Rogez
- Institut Charles Sadron, UPR 22, CNRS, 23 rue du Loess, 67034 Strasbourg Cedex 2, France.
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Martella D, Parmeggiani C. Advances in Cell Scaffolds for Tissue Engineering: The Value of Liquid Crystalline Elastomers. Chemistry 2018; 24:12206-12220. [DOI: 10.1002/chem.201800477] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Daniele Martella
- Chemistry Department “Ugo Schiff”; University of Florence; Via della Lastruccia 3-13 Sesto Fiorentino Italy
- CNR-INO; European Laboratory for Non-Linear Spectroscopy (LENS); University of Florence; via Nello Carrara 1 Sesto Fiorentino Italy
| | - Camilla Parmeggiani
- Chemistry Department “Ugo Schiff”; University of Florence; Via della Lastruccia 3-13 Sesto Fiorentino Italy
- CNR-INO; European Laboratory for Non-Linear Spectroscopy (LENS); University of Florence; via Nello Carrara 1 Sesto Fiorentino Italy
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