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Manipulating the structures and photoresponsive properties of an azobenzene-containing triblock copolymer by changing solvency and adding salts. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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2
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Hou C, Zhou C, Cheng J. Norbornenyl-based amphiphilic ABA-triblock azobenzene copolymers: Synthesis, photoresponsive and self-assembly properties. POLYMER 2021. [DOI: 10.1016/j.polymer.2020.123310] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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3
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Tai HT, Lin YC, Ma JY, Lo CT. Hydrogen Bonding-Induced Assembled Structures and Photoresponsive Behavior of Azobenzene Molecule/Polyethylene Glycol Complexes. Polymers (Basel) 2019; 11:E1360. [PMID: 31426429 PMCID: PMC6723479 DOI: 10.3390/polym11081360] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 08/15/2019] [Accepted: 08/15/2019] [Indexed: 11/22/2022] Open
Abstract
We investigated the self-assembled structures and photoresponsive and crystallization behaviors of supramolecules composed of 4-methoxy-4'-hydroxyazobenzene (Azo) molecules and polyethylene glycol (PEG) that were formed through hydrogen-bonding interactions. The Azo/PEG complexes exhibited the characteristics of photoresponse and crystallization, which originated from Azo and PEG, respectively. When Azo/PEG complexes were dissolved in solvents, hydrogen-bonding interaction hindered the rotation and inversion of mesogens, causing a reduction in the photoisomerization rate compared with the photoisomerization rate of the neat Azo. The confinement of Azo/PEG complexes in thin films further resulted in a substantial decrease in the photoisomerization rate but an increase in the amounts of H-aggregated and J-aggregated mesogens. Regarding PEG crystallization, ultraviolet irradiation of Azo/PEG complexes increased the quantity of high-polarity cis isomers, which improved the compatibility between mesogens and PEG, subsequently increasing the crystallization temperature of PEG. Moreover, the complexation of Azo and PEG induced microphase separation, forming a lamellar morphology. Within the Azo-rich microphases, mesogens aggregated to form tilted monosmectic layers. By contrast, PEG crystallization within the PEG-rich microphases was hard confined, indicating that the domain size of the lamellar morphology was unchanged during PEG crystallization.
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Affiliation(s)
- Hsin-Tzu Tai
- Department of Chemical Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan
| | - Yen-Chun Lin
- Department of Chemical Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan
| | - Jing-Yao Ma
- Department of Chemical Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan
| | - Chieh-Tsung Lo
- Department of Chemical Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701, Taiwan.
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Huang S, Pang L, Chen Y, Zhou L, Fang S, Yu H. Hydrogen Bond Induces Hierarchical Self-Assembly in Liquid-Crystalline Block Copolymers. Macromol Rapid Commun 2018; 39:e1700783. [DOI: 10.1002/marc.201700783] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 01/09/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Shuai Huang
- Department of Material Science and Engineering; College of Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education; Peking University; Beijing 100871 China
| | - Linlin Pang
- State Laboratory of Surface and Interface; Zhengzhou University of Light Industry; Zhengzhou 450002 China
| | - Yuxuan Chen
- Department of Material Science and Engineering; College of Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education; Peking University; Beijing 100871 China
| | - Liming Zhou
- State Laboratory of Surface and Interface; Zhengzhou University of Light Industry; Zhengzhou 450002 China
| | - Shaoming Fang
- State Laboratory of Surface and Interface; Zhengzhou University of Light Industry; Zhengzhou 450002 China
| | - Haifeng Yu
- Department of Material Science and Engineering; College of Engineering and Key Laboratory of Polymer Chemistry and Physics of Ministry of Education; Peking University; Beijing 100871 China
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Honda S, Koga M, Tokita M, Yamamoto T, Tezuka Y. Phase separation and self-assembly of cyclic amphiphilic block copolymers with a main-chain liquid crystalline segment. Polym Chem 2015. [DOI: 10.1039/c5py00346f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effects of the macrocyclization of amphiphiles with a liquid crystalline segment were investigated in the solid state, and electric field-responsive cylindrical micelles and vesicles were self-assembled.
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Affiliation(s)
- Satoshi Honda
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Maito Koga
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Masatoshi Tokita
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Takuya Yamamoto
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
| | - Yasuyuki Tezuka
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo 152-8552
- Japan
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He X, Gao C, Sun W, Huang W, Lin S, Yan D. Synthesis and photoresponsive behavior of azobenzene-containing side-chain liquid crystalline diblock polymers with polypeptide block. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26472] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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9
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Li N, Li Y, Wang X. Photoresponsive submicron-sized hollow spheres obtained from amphiphilic azobenzene-containing random copolymer. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.07.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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10
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Schacher FH, Rupar PA, Manners I. Funktionale Blockcopolymere: nanostrukturierte Materialien mit neuen Anwendungsmöglichkeiten. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201200310] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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11
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Schacher FH, Rupar PA, Manners I. Functional Block Copolymers: Nanostructured Materials with Emerging Applications. Angew Chem Int Ed Engl 2012; 51:7898-921. [DOI: 10.1002/anie.201200310] [Citation(s) in RCA: 564] [Impact Index Per Article: 47.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Indexed: 01/07/2023]
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Menghetti S, Alderighi M, Galli G, Tantussi F, Morandini M, Fuso F, Allegrini M. All-optical pulsed writing in azobenzene copolymer films in the sub-millisecond regime. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm30596h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Abstract
AbstractAmphiphilic macromolecular micelles are advantageous for drug delivery applications due to the decrease of side-effects, ease of screening drugs against degradation, long-term stability, targeted delivery and control of the amount of the released drug. A series of amphiphilic azo-polymers having a flexible or rigid main-chain were synthesized and characterized. The presence of chlorobenzyl side-groups allowed both the easy bonding of photo-sensitive or hydrophilic groups and good control of the degree of substitution. The chemical structure was confirmed by 1H-NMR. The critical concentration of aggregation (CCA) was calculated using the fluorescence emission spectrum of pyrene. The interest was focused on a preliminary study concerning the disaggregation capacity of micelles under UV irradiation. The presence of micellar aggregates was confirmed by DLS and SEM and different organization of the amphiphilic polymers was evidenced depending on polymers concentration and polymers structure. In low polymer concentrations in water predominantly globular aggregates were formed. The increase in concentration increased the polydispersity index due to the fusion of micelles and formation of associates of globular aggregates, inter-micellar associates (clusters) and vesicles.
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Kotharangannagari VK, Sánchez-Ferrer A, Ruokolainen J, Mezzenga R. Photoresponsive Reversible Aggregation and Dissolution of Rod–Coil Polypeptide Diblock Copolymers. Macromolecules 2011. [DOI: 10.1021/ma2008145] [Citation(s) in RCA: 111] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Venkata Krishna Kotharangannagari
- Department of Physics and Frimat Center for Nanomaterials, University of Fribourg, Chemin du Museé 3, 1700 Fribourg, Switzerland
- Food & Soft Materials Science, Institute of Food, Nutrition & Health, ETH Zurich LFO E23, Schmelzbergstrasse 9, 8092 Zurich, Switzerland
| | - Antoni Sánchez-Ferrer
- Food & Soft Materials Science, Institute of Food, Nutrition & Health, ETH Zurich LFO E23, Schmelzbergstrasse 9, 8092 Zurich, Switzerland
| | - Janne Ruokolainen
- Department of Applied Physics, AALTO University, P.O. Box 15100, FIN-00076, Helsinki, Finland
| | - Raffaele Mezzenga
- Food & Soft Materials Science, Institute of Food, Nutrition & Health, ETH Zurich LFO E23, Schmelzbergstrasse 9, 8092 Zurich, Switzerland
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Yu H, Ikeda T. Photocontrollable liquid-crystalline actuators. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2011; 23:2149-2180. [PMID: 21484890 DOI: 10.1002/adma.201100131] [Citation(s) in RCA: 368] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2011] [Revised: 02/23/2011] [Indexed: 05/30/2023]
Affiliation(s)
- Haifeng Yu
- Top Runner Incubation Center for Academia-Industry Fusion and Department of Materials and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan.
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Kimura M, Kitao A, Fukawa T, Shirai H. Rodlike Macromolecules through Spatial Overlapping of Thiophene Dendrons. Chemistry 2011; 17:6821-9. [DOI: 10.1002/chem.201003627] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Revised: 02/17/2011] [Indexed: 11/12/2022]
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17
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Yu H, Kobayashi T, Hu GH. Photocontrolled microphase separation in a nematic liquid–crystalline diblock copolymer. POLYMER 2011. [DOI: 10.1016/j.polymer.2011.01.053] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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18
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Hussain H, Amado E, Kressler J. Functional Polyether-based Amphiphilic Block Copolymers Synthesized by Atom-transfer Radical Polymerization. Aust J Chem 2011. [DOI: 10.1071/ch11147] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This review deals with the synthesis, physical properties, and applications of amphiphilic block copolymers based on hydrophilic poly(ethylene oxide) (PEO) or hydrophobic poly(propylene oxide) (PPO). Oligomeric PEO and PPO are frequently functionalized by converting their OH end groups into macroinitiators for atom-transfer radical polymerization. They are then used to generate additional blocks as part of complex copolymer architectures. Adding hydrophobic and hydrophilic blocks, respectively, leads to polymers with amphiphilic character in water. They are surface active and form micelles above a critical micellization concentration. Together with recent developments in post-polymerization techniques through quantitative coupling reactions (‘click’ chemistry) a broad variety of tailored functionalities can be introduced to the amphiphilic block copolymers. Examples are outlined including stimuli responsiveness, membrane penetrating ability, formation of multi-compartmentalized micelles, etc.
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Schumers JM, Fustin CA, Gohy JF. Light-Responsive Block Copolymers. Macromol Rapid Commun 2010; 31:1588-607. [DOI: 10.1002/marc.201000108] [Citation(s) in RCA: 282] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2010] [Indexed: 11/08/2022]
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Holographic Gratings and Data Storage in Azobenzene-Containing Block Copolymers and Molecular Glasses. ADVANCES IN POLYMER SCIENCE 2010. [DOI: 10.1007/12_2009_35] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
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Yu H, Kobayashi T. Photoresponsive block copolymers containing azobenzenes and other chromophores. Molecules 2010; 15:570-603. [PMID: 20110910 PMCID: PMC6256985 DOI: 10.3390/molecules15010570] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2009] [Revised: 01/11/2010] [Accepted: 01/25/2010] [Indexed: 11/18/2022] Open
Abstract
Photoresponsive block copolymers (PRBCs) containing azobenzenes and other chromophores can be easily prepared by controlled polymerization. Their photoresponsive behaviors are generally based on photoisomerization, photocrosslinking, photoalignment and photoinduced cooperative motions. When the photoactive block forms mesogenic phases upon microphase separation of PRBCs, supramolecular cooperative motion in liquid-crystalline PRBCs enables them to self-organize into hierarchical structures with photoresponsive features. This offers novel opportunities to photocontrol microphase-separated nanostructures of well-defined PRBCs and extends their diverse applications in holograms, nanotemplates, photodeformed devices and microporous films.
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Affiliation(s)
- Haifeng Yu
- Top Runner Incubation Center for Academia-Industry Fusion, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +81 0258-47-9310; Fax: +81 0258-47-9300
| | - Takaomi Kobayashi
- Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan; E-Mail:
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Ouchi M, Terashima T, Sawamoto M. Transition metal-catalyzed living radical polymerization: toward perfection in catalysis and precision polymer synthesis. Chem Rev 2010; 109:4963-5050. [PMID: 19788190 DOI: 10.1021/cr900234b] [Citation(s) in RCA: 1001] [Impact Index Per Article: 71.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Makoto Ouchi
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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24
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Wang LY, Li KC, Lin HC. Synthesis and characterization of side-chain liquid-crystalline block-copolymers containing laterally attached photoluminescent quinquephenyl units via ATRP. POLYMER 2010. [DOI: 10.1016/j.polymer.2009.10.071] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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Yu H, Kobayashi T. Fabrication of stable nanocylinder arrays in highly birefringent films of an amphiphilic liquid-crystalline diblock copolymer. ACS APPLIED MATERIALS & INTERFACES 2009; 1:2755-2762. [PMID: 20356153 DOI: 10.1021/am900509v] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
An amphiphilic liquid-crystalline diblock copolymer (LCDC) with a highly birefringent cyanobiphenyl (CB) group as a mesogen was prepared by atom-transfer radical polymerization. The obtained LCDC showed a well-defined structure and a narrow molecular-weight distribution. In its spin-coated films, both liquid-crystalline (LC) alignment and microphase-separated nanostructures were systematically studied. Random LC arrangement and ambiguous microphase separation were observed in as-prepared films because of the high viscosity at room temperature. Upon annealing of the films in an isotropic phase of the LCDC, the CB mesogens self-organized into a smectic texture of a conic fan and the microphase separation proceeded completely. It is the supramolecular cooperative motion that enables the LCDC to hierarchically assemble into a regular patterning of normally aligned nanocylinders to the substrate, dispersed in the out-of-plane-oriented mesogens. With the help of homogeneous alignment of the CB groups induced by a rubbing technique, uniform patterning of highly ordered nanocylinders parallel to the rubbing direction was successfully fabricated in the plane. The fabricated perpendicular and parallel patterning of nanocylinders dispersed in the highly birefringent films with the CB block as the majority phase show good stability under room light, indicating their potential applications as nanotemplates for preparing advanced nanoscaled materials.
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Affiliation(s)
- Haifeng Yu
- Top Runner Incubation Center for Academia-Industry Fusion and Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka, 940-2188 Nagaoka, Niigata, Japan.
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Wang D, Liu J, Ye G, Wang X. Amphiphilic block copolymers bearing strong push–pull azo chromophores: Synthesis, micelle formation and photoinduced shape deformation. POLYMER 2009. [DOI: 10.1016/j.polymer.2008.11.010] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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27
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Wang D, Ren H, Wang X, Wang X. Amphiphilic Diblock Copolymers Functionalized with Strong Push−Pull Azo Chromophores: Synthesis and Multi-Morphological Aggregation. Macromolecules 2008. [DOI: 10.1021/ma801565e] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dongrui Wang
- Department of Chemical Engineering, Laboratory for Advanced Materials, Tsinghua University, Beijing 100084, P. R. China
| | - Huifeng Ren
- Department of Chemical Engineering, Laboratory for Advanced Materials, Tsinghua University, Beijing 100084, P. R. China
| | - Xiaoqi Wang
- Department of Chemical Engineering, Laboratory for Advanced Materials, Tsinghua University, Beijing 100084, P. R. China
| | - Xiaogong Wang
- Department of Chemical Engineering, Laboratory for Advanced Materials, Tsinghua University, Beijing 100084, P. R. China
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Yu H, Naka Y, Shishido A, Ikeda T. Well-Defined Liquid-Crystalline Diblock Copolymers with an Azobenzene Moiety: Synthesis, Photoinduced Alignment and their Holographic Properties. Macromolecules 2008. [DOI: 10.1021/ma801077g] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Haifeng Yu
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1-11, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Yumiko Naka
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1-11, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Atsushi Shishido
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1-11, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Tomiki Ikeda
- Chemical Resources Laboratory, Tokyo Institute of Technology, R1-11, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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Ding L, Mao H, Xu J, He J, Ding X, Russell TP, Robello DR, Mis M. Morphological Study on an Azobenzene-Containing Liquid Crystalline Diblock Copolymer. Macromolecules 2008. [DOI: 10.1021/ma702625c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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30
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He X, Sun W, Yan D, Xie M, Zhang Y. Synthesis and characterization of side-chain liquid crystalline ABC triblock copolymers withp-methoxyazobenzene moieties by atom transfer radical polymerization. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.22779] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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31
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He X, Sun W, Yan D, Liang L. Novel ABC2-type liquid-crystalline block copolymers with azobenzene moieties prepared by atom transfer radical polymerization. Eur Polym J 2008. [DOI: 10.1016/j.eurpolymj.2007.11.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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32
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Wang D, Ye G, Wang X. Synthesis of Aminoazobenzene-Containing Diblock Copolymer and Photoinduced Deformation Behavior of its Micelle-Like Aggregates. Macromol Rapid Commun 2007. [DOI: 10.1002/marc.200700424] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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33
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Lee KW, Lin HC. Synthesis and characterization of side-chain liquid crystalline homopolymers and block copolymers containing biphenyl-4-ylthiophene and biphenyl-4-ylfluorene pendants. POLYMER 2007. [DOI: 10.1016/j.polymer.2007.04.057] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Bo Q, Zhao Y. Fluorescence from an azobenzene-containing diblock copolymer micelle in solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:5746-51. [PMID: 17407334 DOI: 10.1021/la063551x] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We report the observation of unusual fluorescence emission from an azobenzene-containing polymer micellar solution. An amphiphilic diblock copolymer composed of the hydrophilic quaternized poly(4-vinyl pyridine) (QP4VP) and a hydrophobic liquid crystalline polymethacrylate bearing azobenzene side groups (PAzoMA) is nonfluorescent in molecularly dissolved state in N,N-dimethyl formamide (DMF) but becomes fluorescent as a result of the micellization upon addition of water, which confines azobenzene groups into the core region of micellar aggregates. Experimental results suggest that the micellization-enhanced fluorescence was caused by a slowdown, due to the confinement effect, in the rate of the trans-to-cis photoisomerization that is the main nonradiative relaxation process for excited azobenzene groups in the trans form. Furthermore, it was found that the fluorescence intensity of aqueous micellar solution is sensitive to changes in pH (reversible fluorescence variation) and to illumination (irreversible fluorescence variation). The results indicate that a subtle change in the state of polymer micellar association may alter the confining state of azobenzene groups responsible for the fluorescence emission.
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Affiliation(s)
- Qi Bo
- Département de Chimie, Université de Sherbrooke, Sherbrooke, Québec, Canada J1K 2R1
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Yu H, Asaoka S, Shishido A, Iyoda T, Ikeda T. Photoinduced nanoscale cooperative motion in a well-defined triblock copolymer. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2007; 3:768-71. [PMID: 17429816 DOI: 10.1002/smll.200600724] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Affiliation(s)
- Haifeng Yu
- Chemical Resources Laboratory, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama, Japan
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Yu H, Shishido A, Iyoda T, Ikeda T. Novel Wormlike Nanostructures Self-Assembled in a Well Defined Liquid Crystalline Diblock Copolymer with Azobenzene Moieties. Macromol Rapid Commun 2007. [DOI: 10.1002/marc.200600901] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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37
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Zhang Y, Zhang W, Chen X, Cheng Z, Wu J, Zhu J, Zhu X. Synthesis of novel three-arm star azo side-chain liquid crystalline polymer via ATRP and photoinduced surface relief gratings. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.22423] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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38
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Tang X, Gao L, Fan X, Zhou Q. ABA-type amphiphilic triblock copolymers containingp-ethoxy azobenzene via atom transfer radical polymerization: Synthesis, characterization, and properties. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.21989] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Yu H, Shishido A, Li J, Kamata K, Iyoda T, Ikeda T. Stable macroscopic nanocylinder arrays in an amphiphilic diblock liquid-crystalline copolymer with successive hydrogen bonds. ACTA ACUST UNITED AC 2007. [DOI: 10.1039/b705748b] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hussain H, Mya KY, Xiao Y, He C. Octafunctional cubic silsesquioxane (CSSQ)/poly(methyl methacrylate) nanocomposites: Synthesis by atom transfer radical polymerization at mild conditions and the influence of CSSQ on nanocomposites. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.22422] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Tang X, Gao L, Han N, Fan X, Zhou Q. Synthesis and characterization of 4-arm star side-chain liquid crystalline polymers containing azobenzene with different terminal substituents via ATRP. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.22084] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Tang X, Gao L, Fan X, Zhou Q. Effect of the terminal substituent of azobenzene on the properties of ABA triblock copolymers via atom transfer radical polymerization. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.22263] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Wang G, Zhu X, Wu J, Zhu J, Chen X, Cheng Z. Synthesis and photoinduced surface-relief grating of well-defined azo-containing polymethacrylates via atom transfer radical polymerization. J Appl Polym Sci 2007. [DOI: 10.1002/app.24828] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Lee KW, Wei KH, Lin HC. Synthesis and characterization of liquid-crystalline block copolymers with cyanoterphenyl moieties by atom transfer radical polymerization. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/pola.21556] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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