51
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Yamanaka T, Endo K. Network Formation of Interlocked Copolymer Obtained from Copolymerization of 1,2-Dithiane and Lipoic Acid by Metal Salt. Polym J 2007. [DOI: 10.1295/polymj.pj2007069] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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52
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Yu F, He J, Wang X, Gao G, Yang Y. Synthesis of graft copolymers with “V-shaped” and “Y-shaped” side chains via controlled radical and anionic polymerizations. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.22155] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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53
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54
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Takeuchi D, Inoue A, Osakada K, Kobayashi M, Yamaguchi K. Palladium-Complex-Promoted Living Polymerization of 2-Alkoxy-1-methylenecyclopropanes. Synthesis of Linear and Cyclic Polymers and Block Copolymers Having Alkoxy and Vinylidene Groups. Organometallics 2006. [DOI: 10.1021/om0603013] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Daisuke Takeuchi
- Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan, and Faculty of Pharmaceutical Sciences, Tokushima Bunri University, 1314-1, Shido, Sanuki 769-2193, Japan
| | - Akihisa Inoue
- Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan, and Faculty of Pharmaceutical Sciences, Tokushima Bunri University, 1314-1, Shido, Sanuki 769-2193, Japan
| | - Kohtaro Osakada
- Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan, and Faculty of Pharmaceutical Sciences, Tokushima Bunri University, 1314-1, Shido, Sanuki 769-2193, Japan
| | - Minoru Kobayashi
- Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan, and Faculty of Pharmaceutical Sciences, Tokushima Bunri University, 1314-1, Shido, Sanuki 769-2193, Japan
| | - Kentaro Yamaguchi
- Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama 226-8503, Japan, and Faculty of Pharmaceutical Sciences, Tokushima Bunri University, 1314-1, Shido, Sanuki 769-2193, Japan
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55
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Endo K, Yamanaka T. Copolymerization of Lipoic Acid with 1,2-Dithiane and Characterization of the Copolymer as an Interlocked Cyclic Polymer. Macromolecules 2006. [DOI: 10.1021/ma060063n] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kiyoshi Endo
- Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Taku Yamanaka
- Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka 558-8585, Japan
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56
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Ouarti N, Viville P, Lazzaroni R, Minatti E, Schappacher M, Deffieux A, Putaux JL, Borsali R. Micellar aggregation in blends of linear and cyclic poly(styrene-b-isoprene) diblock copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:9085-90. [PMID: 16171336 DOI: 10.1021/la050935z] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The morphology of micelles formed from blends of linear and cyclic poly(styrene-b-isoprene) (PS-b-PI) block copolymers has been investigated in solution using dynamic light scattering (DLS) and in thin solid deposits by atomic force microscopy (AFM) and transmission electron microscopy under cryogenic conditions (cryo-TEM). Micelles of the pure cyclic PS(290)-b-PI(110) copolymers are wormlike cylindrical objects built by unidirectional aggregation of 33 nm wide sunflower micelles, while the linear block copolymer having the same volume fraction and molar mass forms spherical micelles 40 nm in diameter. The DLS, AFM, and cryo-TEM results consistently show that the addition of the linear copolymer (even for amounts as low as 5% w/w) to the cyclic copolymer rather favors the formation of spherical micelles at the expense of the cylindrical aggregates. Those results clearly show that the linear block copolymer chains can be used to stabilize the thermodynamically unstable elementary sunflower micelle. The thermal stability of the micelles (from the pure copolymers and from the blends) has been examined in solid deposits with in situ AFM measurements. Coalescence starts at about 70 degrees C, and the surface roughness shows a two-step decrease toward a fully homogeneous and flat structure.
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Affiliation(s)
- Nadia Ouarti
- Service de Chimie des Matériaux Nouveaux, Université de Mons-Hainaut/Materia Nova, 20 Place du Parc, 7000 Mons, Belgium.
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57
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Babin J, Rodriguez-Hernandez J, Lecommandoux S, Klok HA, Achard MF. Self-assembled nanostructures from peptide-synthetic hybrid block copolymers: complex, stimuli-responsive rod-coil architectures. Faraday Discuss 2005; 128:179-92. [PMID: 15658774 DOI: 10.1039/b403203a] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis, solution and solid state self-assembly properties of a series of polyisoprene-b-poly(epsilon-benzyloxycarbonyl-L-lysine) PI-b-PZLys and polyisoprene-b-poly(L-lysine) PI-b-PLys block copolymers have been examined. The formation of stimuli-responsive micelles in water has been studied as a function of pH and ionic strength using static and dynamic light scattering, UV-circular dichroism and transmission electron microscopy. The observed change in the micelles dimensions has been directly attributed to the conformational transition in the secondary structure of polypeptide chains. In bulk, these rod-coil copolymers form self-assembled structures that have been characterized using DSC, DMA, WAXS and SAXS techniques. Hexagonal in lamellar (HL) and more interestingly hexagonal in hexagonal (HH) morphologies have been evidenced as a function of the chemical composition.
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Affiliation(s)
- Jérôme Babin
- Laboratoire de Chimie des Polymères Organiques, CNRS, ENSCPB-Université Bordeaux 1, PESSAC, France
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58
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Ouarti N, Viville P, Lazzaroni R, Minatti E, Schappacher M, Deffieux A, Borsali R. Control of the morphology of linear and cyclic PS-b-PI block copolymer micelles via PS addition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:1180-1186. [PMID: 15697258 DOI: 10.1021/la048944f] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We have studied the effect of polystyrene (PS) homopolymer addition on the morphology of self-assembled block copolymer micelles made from linear or cyclic poly(styrene-b-isoprene), PS-b-PI, in a selective solvent for the PI block (heptane). Both copolymers have the same composition: the degree of polymerization is 290 for the PS block, and 110 for the PI block, and we focused on the influence of the addition of small amounts of PS homopolymer on the micellar morphology. For the copolymer concentrations considered, the linear copolymer self-organizes into spherical micelles while the cyclic copolymer forms cylindrical micelles. PS and PI chains constitute the core and the corona of these micelles, respectively, due to the different affinity of the blocks for heptane. Consequently, the PS homopolymer added is "solubilized" into the micellar core. Dynamic light scattering (DLS) data combined with atomic force microscopy (AFM) results show that the addition of PS homopolymer induces a drastic change in the micellar organization. Indeed, a morphological transition, from spheres to cylinders for the linear copolymer, and from cylinders to vesicles for the cyclic copolymer, is observed. These results highlight the fact that a small incorporation of PS homopolymer is clearly sufficient to modify the morphology (size and shape) of the micelles. This approach could be a key parameter for the design/control of micelles for specific applications in nanotechnology.
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Affiliation(s)
- Nadia Ouarti
- Laboratoire de Chimie des Polymères Organiques, CNRS, ENSCPB and Bordeaux-1 University, 16 Avenue Pey Berland 33607 PESSAC CEDEX, France.
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59
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Qian HJ, Lu ZY, Chen LJ, Li ZS, Sun CC. Computer Simulation of Cyclic Block Copolymer Microphase Separation. Macromolecules 2005. [DOI: 10.1021/ma0478658] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hu-Jun Qian
- State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China
| | - Zhong-Yuan Lu
- State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China
| | - Li-Jun Chen
- State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China
| | - Ze-Sheng Li
- State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China
| | - Chia-Chung Sun
- State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China
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60
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Microphase Separation of Linear and Cyclic Block Copolymers Poly(styrene-b-isoprene): SAXS Experiments. Macromolecules 2004. [DOI: 10.1021/ma035627r] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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61
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Singla S, Zhao T, Beckham HW. Purification of Cyclic Polymers Prepared from Linear Precursors by Inclusion Complexation of Linear Byproducts with Cyclodextrins. Macromolecules 2003. [DOI: 10.1021/ma034654e] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Swati Singla
- School of Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Tiejun Zhao
- School of Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Haskell W. Beckham
- School of Textile and Fiber Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
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62
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Designing 8-Shaped Polymer Topology by Metathesis Condensation with Cyclic Poly(THF) Precursors Having Allyl Groups. Macromolecules 2002. [DOI: 10.1021/ma021495a] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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63
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Zhu Y, Gido SP, Iatrou H, Hadjichristidis N, Mays JW. Microphase Separation of Cyclic Block Copolymers of Styrene and Butadiene and of Their Corresponding Linear Triblock Copolymers. Macromolecules 2002. [DOI: 10.1021/ma021408e] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | - Jimmy W. Mays
- Department of Chemistry, University of Tennessee, 655 Buehler Hall, Knoxville, Tennessee 37996-1600
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64
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Tezuka Y, Komiya R. Metathesis Polymer Cyclization with Telechelic Poly(THF) Having Allyl Groups. Macromolecules 2002. [DOI: 10.1021/ma021023w] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yasuyuki Tezuka
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8552 Japan
| | - Ryota Komiya
- Department of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo, 152-8552 Japan
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