1
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König N, Willner L, Pipich V, Mahmoudi N, Lund R. Tale of Two Tails: Molecular Exchange Kinetics of Telechelic Polymer Micelles. PHYSICAL REVIEW LETTERS 2020; 124:197801. [PMID: 32469600 DOI: 10.1103/physrevlett.124.197801] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 04/14/2020] [Indexed: 06/11/2023]
Abstract
Telechelic polymers contain two chain ends that are able to promote self-assembly into "flowerlike" or interconnected micellar structures. Here, we investigate the molecular exchange kinetics of such micelles using time-resolved small-angle neutron scattering. We show that the activation energies of monofunctional and telechelic chain exchange are identical. This demonstrates that the two chain ends are not simultaneously released in a single event. Instead, the results show that, contrary to regular micelles, the kinetics occurs in a multistep process involving a collision-induced single-molecule exchange mechanism where the exchange rate is directly proportional to the polymer concentration. We show that this novel mechanism can be quantitatively explained by a simple kinetic model.
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Affiliation(s)
- Nico König
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
- Jülich Centre for Neutron Science (JCNS) and Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Lutz Willner
- Jülich Centre for Neutron Science (JCNS) and Institute for Complex Systems (ICS), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Vitaliy Pipich
- Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, 85747 Garching, Germany
| | - Najet Mahmoudi
- ISIS-STFC, Rutherford Appleton Laboratory, Chilton, Oxon OX11 0QX, United Kingdom
| | - Reidar Lund
- Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
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2
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Zinn T, Willner L, Knudsen KD, Lund R. Self-Assembly of Mixtures of Telechelic and Monofunctional Amphiphilic Polymers in Water: From Clusters to Flowerlike Micelles. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b01501] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Thomas Zinn
- Department
of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo, Norway
| | - Lutz Willner
- Jülich
Centre for Neutron Science JCNS and Institute for Complex Systems
ICS, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Kenneth D. Knudsen
- Department
of Physics, Institute for Energy Technology, Postboks 40, 2027 Kjeller, Norway
| | - Reidar Lund
- Department
of Chemistry, University of Oslo, Postboks 1033 Blindern, 0315 Oslo, Norway
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3
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Yuan F, Larson RG. Multiscale Molecular Dynamics Simulations of Model Hydrophobically Modified Ethylene Oxide Urethane Micelles. J Phys Chem B 2015; 119:12540-51. [PMID: 26337615 DOI: 10.1021/acs.jpcb.5b04895] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The flower-like micelles of various aggregation numbers of a model hydrophobically modified ethylene oxide urethane (HEUR) molecule, C16E45C16, and their corresponding starlike micelles, containing the surfactants C16E22 and C16E23, were studied by atomistic and coarse-grained molecular dynamic (MD) simulations. We used free energies from umbrella sampling to calculate the size distribution of micelle sizes and the average time for escape of a hydrophobic group from the micelle. Using the coarse-grained MARTINI force field, the most probable size of the model HEUR molecule was thereby determined to be about 80 hydrophobes per micelle and the average hydrophobe escape time to be about 0.1 s, both of which are consistent with previous experimental studies. Atomistic simulations reveal that hydrogen bond formation and the mean lifetime of hydration waters of the poly(ethylene oxide) (or PEO) groups are location-dependent in the HEUR micelle, with PEO groups immediately adjacent to the C16 groups forming the fewest hydrogen bonds with water and having hydration waters with longer lifetimes than those of the PEO groups located further away from the C16 groups.
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Affiliation(s)
- Fang Yuan
- Department of Chemical Engineering and ‡Departments of Mechanical Engineering, Biomedical Engineering, and Macromolecular Science and Engineering Program, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Ronald G Larson
- Department of Chemical Engineering and ‡Departments of Mechanical Engineering, Biomedical Engineering, and Macromolecular Science and Engineering Program, University of Michigan , Ann Arbor, Michigan 48109, United States
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4
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Van Dyk AK, Chatterjee T, Ginzburg VV, Nakatani AI. Shear-Dependent Interactions in Hydrophobically Modified Ethylene Oxide Urethane (HEUR) Based Coatings: Mesoscale Structure and Viscosity. Macromolecules 2015. [DOI: 10.1021/ma502174x] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Antony K. Van Dyk
- Dow Coatings Materials, The Dow Chemical Company, Collegeville, Pennsylvania 19426, United States
| | - Tirtha Chatterjee
- Materials Science and Engineering, The Dow Chemical Company, Midland, Michigan 48674, United States
| | - Valeriy V. Ginzburg
- Materials Science and Engineering, The Dow Chemical Company, Midland, Michigan 48674, United States
| | - Alan I. Nakatani
- Analytical
Sciences, The Dow Chemical Company, Collegeville, Pennsylvania 19426, United States
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5
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Patterson JP, Kelley EG, Murphy RP, Moughton AO, Robin M, Lu A, Colombani O, Chassenieux C, Cheung D, Sullivan MO, Epps TH, O’Reilly RK. Structural characterization of amphiphilic homopolymer micelles using light scattering, SANS, and cryo-TEM. Macromolecules 2013; 46:6319-6325. [PMID: 24058209 PMCID: PMC3777398 DOI: 10.1021/ma4007544] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the aqueous solution self-assembly of a series of poly(N-isopropylacrylamide) (PNIPAM) polymers end-functionalized with a hydrophobic sulfur-carbon-sulfur (SCS) pincer ligand. Although the hydrophobic ligand accounted for <5 wt% of the overall homopolymer mass, the polymers self-assembled into well-defined spherical micelles in aqueous solution, and these micelles are potential precursors to solution-assembled nanoreactors for small molecule catalysis applications. The micelle structural details were investigated using light scattering, cryogenic transmission electron microscopy (cryo-TEM), and small angle neutron scattering (SANS). Radial density profiles extracted from the cryo-TEM micrographs suggested that the PNIPAM chains formed a diffuse corona with a radially decreasing corona density profile and provided valuable a priori information about the micelle structure for SANS data modeling. SANS analysis indicated a similar profile in which the corona surrounded a small hydrophobic core containing the pincer ligand. The similarity between the SANS and cryo-TEM results demonstrated that detailed information about the micelle density profile can be obtained directly from cryo-TEM and highlighted the complementary use of scattering and cryo-TEM in the structural characterization of solution-assemblies, such as the SCS pincer-functionalized homopolymers described here.
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Affiliation(s)
- Joseph P. Patterson
- University of Warwick, Department of Chemistry, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom
| | - Elizabeth G. Kelley
- University of Warwick, Department of Chemistry, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom
| | - Ryan P. Murphy
- University of Delaware, Department of Chemical and Biomolecular Engineering, 150 Academy Street, Newark, DE 19716, United States
| | - Adam O. Moughton
- University of Warwick, Department of Chemistry, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom
| | - Mathew Robin
- University of Warwick, Department of Chemistry, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom
| | - Annhelen Lu
- University of Warwick, Department of Chemistry, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom
| | - Olivier Colombani
- LUNAM Université, Université du Maine, IMMM UMR CNRS 6283, Département PCI, Avenue Olivier Messiaen, 72085 Le Mans Cedex 09, France
| | - Christophe Chassenieux
- LUNAM Université, Université du Maine, IMMM UMR CNRS 6283, Département PCI, Avenue Olivier Messiaen, 72085 Le Mans Cedex 09, France
| | - David Cheung
- University of Warwick, Department of Chemistry, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom
| | - Millicent O. Sullivan
- University of Delaware, Department of Chemical and Biomolecular Engineering, 150 Academy Street, Newark, DE 19716, United States
| | - Thomas H. Epps
- University of Delaware, Department of Chemical and Biomolecular Engineering, 150 Academy Street, Newark, DE 19716, United States
| | - Rachel K. O’Reilly
- University of Warwick, Department of Chemistry, Gibbet Hill Road, Coventry, CV4 7AL, United Kingdom
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Chen S, Duhamel J. Probing the hydrophobic interactions of a series of pyrene end-labeled poly(ethylene oxide)s in aqueous solution using time-resolved fluorescence. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2821-2834. [PMID: 23305407 DOI: 10.1021/la304628d] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The hydrophobic association of a series of poly(ethylene oxide)s covalently labeled at both ends with pyrene (PEO(X)-Py2 where X represents the number average molecular weight (Mn) of the PEO chains equal to 2, 5, 10, and 16.5 kDa) in aqueous solutions was investigated at different polymer concentrations (CP) using steady-state and time-resolved fluorescence measurements. Phase separation was observed with PEO(2 kDa)-Py2 and PEO(5 kDa)-Py2 samples at high CP. The steady-state fluorescence spectra showed that the ratios of excimer-to-monomer fluorescence intensities (IE/IM) of all PEO samples remained constant when CP was below 4 × 10(-5) M and decreased dramatically with increasing PEO chain length due to a decrease in intramolecular pyrene excimer formation. The IE/IM ratio in this regime was found to scale as Mn(-2.3±0.2). For CP > 4 × 10(-5) M, pyrene excimer is formed by both intra- and intermolecular interactions and the IE/IM ratio increases linearly with increasing CP except for PEO(2 kDa)-Py2 which undergoes phase separation. The decays obtained at various polymer concentrations were fitted according to a "sequential model" (SM) which assumes that the pyrene excimer is formed in a sequential manner. The molar fractions of all excited pyrene species and the rate constants for pyrene excimer formation were determined from the global analysis of the monomer and excimer fluorescence decays. The fraction of pyrenes that formed excimer from ground-state pyrene aggregates (fE0) was found to increase with CP in the regime where the pyrene excimer is formed both intra- and intermolecularly and decrease with Mn in the regime where the pyrene excimer is formed only intramolecularly. The fraction of pyrene pendants subject to hydrophobic interactions were used to determine the hydrophobic capture radius (Rc) of pyrene in water from the distribution of PEO end-to-end distances. Rc was found to equal 2.2 ± 0.2 nm using fE0.
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Affiliation(s)
- Shaohua Chen
- Institute for Polymer Research, Waterloo Institute for Nanotechnology, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
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7
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Herfurth C, Malo de Molina P, Wieland C, Rogers S, Gradzielski M, Laschewsky A. One-step RAFT synthesis of well-defined amphiphilic star polymers and their self-assembly in aqueous solution. Polym Chem 2012. [DOI: 10.1039/c2py20126g] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Rufier C, Collet A, Viguier M, Oberdisse J, Mora S. Influence of Surfactants on Hydrophobically End-Capped Poly(ethylene oxide) Self-Assembled Aggregates Studied by SANS. Macromolecules 2011. [DOI: 10.1021/ma201150g] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | - Julian Oberdisse
- Laboratoire Leon Brillouin, CEA Saclay, F-91191 Gif Sur Yvette, France
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9
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Lai CT, Chien RH, Kuo SW, Hong JL. Tetraphenylthiophene-Functionalized Poly(N-isopropylacrylamide): Probing LCST with Aggregation-Induced Emission. Macromolecules 2011. [DOI: 10.1021/ma201089j] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Chung-Tin Lai
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, Republic of China
| | - Rong-Hong Chien
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, Republic of China
| | - Shiao-Wei Kuo
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, Republic of China
| | - Jin-Long Hong
- Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, Republic of China
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10
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Koga T, Tanaka F, Motokawa R, Koizumi S, Winnik FM. Theoretical Modelling of Hierarchically Associated Structures in Hydrophobically Modified PNIPAM Aqueous Solutions on the Basis of a Neutron Scattering Study. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/masy.201050521] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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11
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Volet G, Deschamps ACL, Amiel C. Association of hydrophobically α,ω-end-capped poly(2-methyl-2-oxazoline) in water. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.24019] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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12
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Taribagil RR, Hillmyer MA, Lodge TP. Hydrogels from ABA and ABC Triblock Polymers. Macromolecules 2010. [DOI: 10.1021/ma100464z] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Timothy P. Lodge
- Department of Chemical Engineering & Materials Science
- Department of Chemistry
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13
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Conformations and Solution Properties of Star-Branched Polyelectrolytes. SELF ORGANIZED NANOSTRUCTURES OF AMPHIPHILIC BLOCK COPOLYMERS I 2010. [DOI: 10.1007/12_2010_104] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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14
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Volet G, Auvray L, Amiel C. Monoalkyl poly(2-methyl-2-oxazoline) micelles. a small-angle neutron scattering study. J Phys Chem B 2009; 113:13536-44. [PMID: 19769344 DOI: 10.1021/jp9029634] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This paper presents a SANS study of hydrophobically end-modified poly(2-methyl-2-oxazoline) (POXZ-C(n)) micelles in aqueous solutions. Strong long-range repulsive interactions between the micelles are evidenced by correlation peaks present at concentrations as low as 0.5 wt %. Due to the dissymmetry in size between the hydrophobic and hydrophilic parts of the chains, the micelles have been analyzed using a model of star-like micelles. Large extension of the POXZ arms into the micelles can explain the original SANS behavior. The dissociation of the micellar structures by adding a complexing agent of the alkyl groups, hydroxypropy-beta-cyclodextrin (HPbeta-CD), has been followed by SANS. The micelles are progressively disrupted by the addition of increasing amounts of HPbeta-CD, and the SANS behavior of free chains is recovered in the presence of an excess of the complexing agent.
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Affiliation(s)
- Gisèle Volet
- Systèmes Polymères Complexes, Institut de Chimie et des Matériaux Paris-Est, 2 rue Henri Dunant, 94320 Thiais, France.
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15
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Koga T, Tanaka F, Motokawa R, Koizumi S, Winnik FM. Theoretical Modeling of Associated Structures in Aqueous Solutions of Hydrophobically Modified Telechelic PNIPAM Based on a Neutron Scattering Study. Macromolecules 2008. [DOI: 10.1021/ma800957z] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tsuyoshi Koga
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8510, Japan; Soft Matter & Neutron Scattering Group, ASRC, JAEA, Ibaraki 319-1195, Japan; and Department of Chemistry and Faculty of Pharmacy, University of Montréal, CP 6128, Succursale Centre Ville, Montréal QC, Canada H3C 3J7
| | - Fumihiko Tanaka
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8510, Japan; Soft Matter & Neutron Scattering Group, ASRC, JAEA, Ibaraki 319-1195, Japan; and Department of Chemistry and Faculty of Pharmacy, University of Montréal, CP 6128, Succursale Centre Ville, Montréal QC, Canada H3C 3J7
| | - Ryuhei Motokawa
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8510, Japan; Soft Matter & Neutron Scattering Group, ASRC, JAEA, Ibaraki 319-1195, Japan; and Department of Chemistry and Faculty of Pharmacy, University of Montréal, CP 6128, Succursale Centre Ville, Montréal QC, Canada H3C 3J7
| | - Satoshi Koizumi
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8510, Japan; Soft Matter & Neutron Scattering Group, ASRC, JAEA, Ibaraki 319-1195, Japan; and Department of Chemistry and Faculty of Pharmacy, University of Montréal, CP 6128, Succursale Centre Ville, Montréal QC, Canada H3C 3J7
| | - Françoise M. Winnik
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8510, Japan; Soft Matter & Neutron Scattering Group, ASRC, JAEA, Ibaraki 319-1195, Japan; and Department of Chemistry and Faculty of Pharmacy, University of Montréal, CP 6128, Succursale Centre Ville, Montréal QC, Canada H3C 3J7
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16
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Kadam VS, Badiger MV, Wadgaonkar PP, Ducouret G, Hourdet D. Synthesis and self-assembling properties of α,ω-hydroxy-poly(ethylene oxide) end-capped with 1-isocyanato-3-pentadecylcyclohexane. POLYMER 2008. [DOI: 10.1016/j.polymer.2008.07.064] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Laurati M, Stellbrink J, Lund R, Willner L, Zaccarelli E, Richter D. Asymmetric poly(ethylene-alt-propylene)-poly(ethylene oxide) micelles: a system with starlike morphology and interactions. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2007; 76:041503. [PMID: 17994990 DOI: 10.1103/physreve.76.041503] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2007] [Indexed: 05/25/2023]
Abstract
We report on an experimental study of single particle properties and interactions of poly(ethylene-alt-propylene)-poly(ethylene oxide) (PEP-PEO) starlike micelles. The starlike regime is achieved by an extremely asymmetric block ratio (1:20) and the number of arms (functionality) is changed by varying the composition of the solvent (the interfacial tension). Small angle neutron scattering (SANS) data in the dilute regime can be modeled by assuming a constant density profile in the micellar core (compact core) and a starlike density profile in the corona (starlike shell). The starlike morphology of the corona is confirmed by a direct comparison with SANS measurements of dilute poly butadiene star solutions. Comparison of structure factors obtained by SANS measurements in the concentrated regime shows in addition that the interactions in the two systems are equivalent. Micellar structure factors at several packing fractions can be modeled by using the ultrasoft potential recently proposed for star polymers [Likos, Phys. Rev. Lett. 80, 4450 (1998)]. The experimental phase diagram of PEP-PEO micelles is quantitatively compared to theoretical expectations, finding good agreement for the location of the liquid-solid boundary and excellent agreement for the critical packing fraction where the liquid-to-bcc crystal transition takes place for f<70. The functionality, i.e., the coronal density, strongly influences the nature of the solid phase: for f<70 the system crystallizes into a bcc phase, high f>70 formation of amorphous arrested states prevents crystallization.
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Affiliation(s)
- M Laurati
- Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany.
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18
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English RJ, Ratcliffe I, Blanchard RL, Parsons BJ. Effect of Polydispersity on Fluorescence Quenching in Micelles Formed by Telechelic Associative Polymers. Macromolecules 2007. [DOI: 10.1021/ma0624649] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Robert J. English
- Centre for Water-Soluble Polymers, The North East Wales Institute of Higher Education, Wrexham, LL11 2AW, UK, and Faculty of Health, Leeds Metropolitan University, Leeds, LS1 3HE, UK
| | - Ian Ratcliffe
- Centre for Water-Soluble Polymers, The North East Wales Institute of Higher Education, Wrexham, LL11 2AW, UK, and Faculty of Health, Leeds Metropolitan University, Leeds, LS1 3HE, UK
| | - Rowan-Louise Blanchard
- Centre for Water-Soluble Polymers, The North East Wales Institute of Higher Education, Wrexham, LL11 2AW, UK, and Faculty of Health, Leeds Metropolitan University, Leeds, LS1 3HE, UK
| | - Barry J. Parsons
- Centre for Water-Soluble Polymers, The North East Wales Institute of Higher Education, Wrexham, LL11 2AW, UK, and Faculty of Health, Leeds Metropolitan University, Leeds, LS1 3HE, UK
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19
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Yoshida T, Taribagil R, Hillmyer MA, Lodge TP. Viscoelastic Synergy in Aqueous Mixtures of Wormlike Micelles and Model Amphiphilic Triblock Copolymers. Macromolecules 2007. [DOI: 10.1021/ma062428+] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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Karaky K, Péré E, Pouchan C, Desbrières J, Dérail C, Billon L. Effect of the synthetic methodology on molecular architecture: from statistical to gradient copolymers. SOFT MATTER 2006; 2:770-778. [PMID: 32680217 DOI: 10.1039/b607797h] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Styrene-butyl acrylate (S-BuA) copolymers were synthesized by nitroxide-mediated controlled radical polymerization using an alkoxyamine as an initiator. Using different synthetic methodologies, statistical copolymers were be obtained by batch nitroxide mediated polymerization while the gradient composition was a forced gradient by continuous addition of S during BuA polymerization (semi-batch process). These gradient copolymers have been studied by H NMR and size exclusion chromatography to characterize the gradient composition molecular structure. The evolution of the composition was correlated with the glass transition temperature () of the copolymers. The gradient copolymers exhibit one with a value in between the of polystyrene and poly(butyl acrylate), indicating that the materials did not present well defined microphase separation. Specific organization at the air-polymer interface of such copolymers has also been demonstrated by comparison between classical and attenuated total reflection (ATR) Fourier transform infra-red spectra. This bulk soft matter assembly was confirmed by AFM analysis, which showed a different morphology at the surface and in the bulk following removal of the top layer. Moreover, for the most well defined gradient composition, a specific nano-structuring was demonstrated by small angle neutron scattering. The preliminary rheological properties of these gradient copolymers were studied and are discussed in relation with their molecular structure.
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Affiliation(s)
- Khaled Karaky
- Laboratoire de Physico-Chimie des Polymères, UMR 5067 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc 2 Avenue du Président Angot, 64053 Pau cedex, France.
| | - Eve Péré
- Laboratoire de Chimie Théorique et Physico-chimie Moléculaire, UMR 5624 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc 2 Avenue du Président Angot, 64053 Pau cedex, France.
| | - Claude Pouchan
- Laboratoire de Chimie Théorique et Physico-chimie Moléculaire, UMR 5624 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc 2 Avenue du Président Angot, 64053 Pau cedex, France.
| | - Jacques Desbrières
- Laboratoire de Physico-Chimie des Polymères, UMR 5067 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc 2 Avenue du Président Angot, 64053 Pau cedex, France.
| | - Christophe Dérail
- Laboratoire de Physico-Chimie des Polymères, UMR 5067 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc 2 Avenue du Président Angot, 64053 Pau cedex, France.
| | - Laurent Billon
- Laboratoire de Physico-Chimie des Polymères, UMR 5067 CNRS, Université de Pau et des Pays de l'Adour, Hélioparc 2 Avenue du Président Angot, 64053 Pau cedex, France.
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21
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Mistry D, Annable T, Yuan XF, Booth C. Rheological behavior of aqueous micellar solutions of a triblock copolymer of ethylene oxide and 1,2-butylene oxide: B10E410B10. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:2986-92. [PMID: 16548547 DOI: 10.1021/la0532205] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
A triblock copolymer of ethylene oxide and 1,2-butylene oxide, denoted B10E410B10, was prepared by sequential oxyanionic polymerization and characterized by 13C NMR spectroscopy and gel permeation chromatography. Micellization and the formation of micelle clusters in dilute aqueous solution, the latter a consequence of micelle bridging, was confirmed by dynamic light scattering, and average association numbers of the micelles were determined by static light scattering for T = 20-40 degrees C. The frequency dependence of the dynamic storage and loss moduli was investigated for solutions in the range of 5-20 wt %. Comparison with results for poly(oxyethylene) dialkyl ethers (10 wt %, T = 25 degrees C) indicated that the viscoelasticity of a copolymer with terminal B10 hydrophobic blocks was roughly equivalent to one with terminal C14 alkyl chains. The temperature dependence of the modulus was investigated for 15 wt % solutions at T = 5-40 degrees C. Superposition of the data led, via an Arrhenius plot, to an activation energy for the relaxation process of -40 kJ mol(-1). The negative value contrasts with the positive values found for poly(oxyethylene) dialkyl ethers and related HEUR copolymers with urethane-linked terminal alkyl chains. This difference is attributed to the block-length distribution in copolymer B10E410B10, whereby the activation energy of the relaxation process has a positive contribution from the disengagement of B blocks from micelles but a negative contribution from micellization. The negative value of the activation energy for solutions of B10E410B10 was confirmed by determining the temperature dependence of the zero-shear viscosity of its 15 wt % solution.
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Affiliation(s)
- Dharmista Mistry
- School of Chemistry, University of Manchester, Manchester M13 9PL, United Kingdom
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Temperature-Dependent Properties of Telechelic Hydrophobically Modified Poly(N-isopropylacrylamides) in Water: Evidence from Light Scattering and Fluorescence Spectroscopy for the Formation of Stable Mesoglobules at Elevated Temperatures. Macromolecules 2006. [DOI: 10.1021/ma0600254] [Citation(s) in RCA: 118] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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23
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Grassl B, Billon L, Borisov O, François J. Poly(ethylene oxide)- and poly (acrylamide)-based water-soluble associative polymers: synthesis, characterisation, properties in solution. POLYM INT 2006. [DOI: 10.1002/pi.2015] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Kujawa P, Segui F, Shaban S, Diab C, Okada Y, Tanaka F, Winnik FM. Impact of End-Group Association and Main-Chain Hydration on the Thermosensitive Properties of Hydrophobically Modified Telechelic Poly(N-isopropylacrylamides) in Water. Macromolecules 2005. [DOI: 10.1021/ma051876z] [Citation(s) in RCA: 256] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Piotr Kujawa
- Department of Chemistry and Faculty of Pharmacy, University of Montreal, CP 6128 Succursale Centre Ville, Montreal, QC, Canada H3C 3J7, and Department of Polymer Chemistry, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Florence Segui
- Department of Chemistry and Faculty of Pharmacy, University of Montreal, CP 6128 Succursale Centre Ville, Montreal, QC, Canada H3C 3J7, and Department of Polymer Chemistry, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Sherry Shaban
- Department of Chemistry and Faculty of Pharmacy, University of Montreal, CP 6128 Succursale Centre Ville, Montreal, QC, Canada H3C 3J7, and Department of Polymer Chemistry, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Charbel Diab
- Department of Chemistry and Faculty of Pharmacy, University of Montreal, CP 6128 Succursale Centre Ville, Montreal, QC, Canada H3C 3J7, and Department of Polymer Chemistry, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Yukinori Okada
- Department of Chemistry and Faculty of Pharmacy, University of Montreal, CP 6128 Succursale Centre Ville, Montreal, QC, Canada H3C 3J7, and Department of Polymer Chemistry, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Fumihiko Tanaka
- Department of Chemistry and Faculty of Pharmacy, University of Montreal, CP 6128 Succursale Centre Ville, Montreal, QC, Canada H3C 3J7, and Department of Polymer Chemistry, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Françoise M. Winnik
- Department of Chemistry and Faculty of Pharmacy, University of Montreal, CP 6128 Succursale Centre Ville, Montreal, QC, Canada H3C 3J7, and Department of Polymer Chemistry, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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Laurati M, Stellbrink J, Lund R, Willner L, Richter D, Zaccarelli E. Starlike micelles with starlike interactions: a quantitative evaluation of structure factors and phase diagram. PHYSICAL REVIEW LETTERS 2005; 94:195504. [PMID: 16090186 DOI: 10.1103/physrevlett.94.195504] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2004] [Indexed: 05/03/2023]
Abstract
Starlike PEP-PEO block copolymer micelles offer the possibility to investigate the phase behavior and interactions of regular star polymers (ultrasoft colloids). Micellar functionality f can be smoothly varied by changing solvent composition (interfacial tension). Structure factors obtained by small-angle neutron-scattering can be quantitatively described in terms of an effective potential for star polymers. The experimental phase diagram reproduces to a high level of accuracy the predicted liquid-solid transition. Whereas for intermediate f a bcc phase is observed, for high f the formation of a fcc phase is preempted by glass formation.
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Affiliation(s)
- M Laurati
- Institut für Festkörperforschung, Forschungszentrum Jülich, Germany
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26
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Sommer C, Pedersen JS, Garamus VM. Structure and interactions of block copolymer micelles of Brij 700 studied by combining small-angle X-ray and neutron scattering. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:2137-49. [PMID: 15752000 DOI: 10.1021/la047489k] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Spherical micelles of the diblock copolymer/surfactant Brij 700 (C(18)EO(100)) in water (D(2)O) solution have been investigated by small-angle X-ray scattering (SAXS) and small-angle neutron scattering (SANS). SAXS and SANS experiments are combined to obtain complementary information from the two different contrast conditions of the two techniques. Solutions in a concentration range from 0.25 to 10 wt % and at temperatures from 10 to 80 degrees C have been investigated. The data have been analyzed on absolute scale using a model based on Monte Carlo simulations, where the micelles have a spherical homogeneous core with a graded interface surrounded by a corona of self-avoiding, semiflexible interacting chains. SANS and SAXS data were fitted simultaneously, which allows one to obtain extensive quantitative information on the structure and profile of the core and corona, the chain interactions, and the concentration effects. The model describes the scattering data very well, when part of the EO chains are taken as a "background"contribution belonging to the solvent. The effect of this becomes non-negligible at polymer concentrations as low as 2 wt %, where overlap of the micellar coronas sets in. The results from the analysis on the micellar structure, interchain interactions, and structure factor effects are all consistent with a decrease in solvent quality of water for the PEO block as the theta temperature of PEO is approached.
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Affiliation(s)
- Cornelia Sommer
- Department of Chemistry, University of Aarhus, Langelandsgade 140, DK-8000 Aarhus C, Denmark
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27
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Siu H, Prazeres TJV, Duhamel J, Olesen K, Shay G. Characterization of the Aggregates Made by Short Poly(ethylene oxide) Chains Labeled at One End with Pyrene. Macromolecules 2005. [DOI: 10.1021/ma047959h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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28
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Pellens L, Vermant J, Mewis J. Deviations from the Stress−Optical Rule in Telechelic Associative Polymer Solutions. Macromolecules 2005. [DOI: 10.1021/ma047672k] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Linda Pellens
- Department of Chemical Engineering, K.U. Leuven, W. de Croylaan 46, B-3001 Leuven, Belgium
| | - Jan Vermant
- Department of Chemical Engineering, K.U. Leuven, W. de Croylaan 46, B-3001 Leuven, Belgium
| | - Jan Mewis
- Department of Chemical Engineering, K.U. Leuven, W. de Croylaan 46, B-3001 Leuven, Belgium
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29
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Meng XX, Russel WB. Structure and Size of Spherical Micelles of Telechelic Polymers. Macromolecules 2004. [DOI: 10.1021/ma048968t] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiao-Xia Meng
- Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544
| | - William B. Russel
- Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544
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30
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Habas JP, Pavie E, Perreur C, Lapp A, Peyrelasse J. Nanostructure in block copolymer solutions: rheology and small-angle neutron scattering. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2004; 70:061802. [PMID: 15697392 DOI: 10.1103/physreve.70.061802] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2004] [Revised: 07/06/2004] [Indexed: 05/24/2023]
Abstract
Triblock copolymers composed of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) present an amphiphilic character in aqueous solutions. Since PPO is less hydrophilic than PEO and since their solubilities decrease when the temperature increases, the copolymers self-assemble spontaneously, forming micelles at moderate temperatures. For higher temperatures or concentrations, the copolymers or the micelles are ordered because of repulsive interactions and form lyotropic liquid crystalline phases. These are phases of very great viscosity with the aspect of gels, and transitions between different crystalline phases can occur at fixed concentration during an increase of temperature. We studied solutions of three different copolymers. The first two have a star structure. They are both composed of four branches (EO)x (PO)y fixed on an ethylene diamine, but differ by the values of x and y . Their commercial name is Tetronic 908 (x=114, y=21) and Tetronic 704 (x=16, y=18) . The third copolymer (EO)37(PO)56(EO)37 is linear and is known under the name of Pluronic P105 . The measurements of the shear complex elastic modulus according to the temperature is used to determine the temperatures of the different transitions. Then, small-angle neutron scattering on samples under flow and true crystallographic arguments make it possible to identify the nature of the crystalline phases. For the systems studied, we show that the branched copolymers form only one type of liquid crystalline phase, which is bcc for the T908 and lamellar for the T704 . For the linear copolymer, it is possible to identify three transitions: micellar solution to hexagonal phase, hexagonal phase to body-centered cubic phase, and finally body-centered cubic phase to lamellar phase.
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Affiliation(s)
- Jean-Pierre Habas
- Laboratoire de Physico-Chimie des Polymères UMR 5067, Université de Pau et des Pays de l'Adour, Avenue de l'Université, 64000 Pau, France
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31
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Laruelle G, François J, Billon L. Self-Assembly in Water of Poly(acrylic acid)-Based Diblock Copolymers Synthesized by Nitroxide-Mediated Polymerization. Macromol Rapid Commun 2004. [DOI: 10.1002/marc.200400315] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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32
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Kim M, Choi YW, Sim JH, Choo J, Sohn D. End Chain Length Effect of Hydrophobically End-Capped Poly(ethylene oxide)s on Their Self-Assemblies in Solution. J Phys Chem B 2004. [DOI: 10.1021/jp0492725] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Myungwoong Kim
- Department of Chemistry, Hanyang University, Seoul, 133-791, Korea, and Department of Chemistry, Hanyang University, Ansan 425-791, Korea
| | - Young-Wook Choi
- Department of Chemistry, Hanyang University, Seoul, 133-791, Korea, and Department of Chemistry, Hanyang University, Ansan 425-791, Korea
| | - Jae-Hyun Sim
- Department of Chemistry, Hanyang University, Seoul, 133-791, Korea, and Department of Chemistry, Hanyang University, Ansan 425-791, Korea
| | - Jaebum Choo
- Department of Chemistry, Hanyang University, Seoul, 133-791, Korea, and Department of Chemistry, Hanyang University, Ansan 425-791, Korea
| | - Daewon Sohn
- Department of Chemistry, Hanyang University, Seoul, 133-791, Korea, and Department of Chemistry, Hanyang University, Ansan 425-791, Korea
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33
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Song T, Dai S, Tam K, Lee S, Goh S. Aggregation behavior of two-arm fullerene-containing poly(ethylene oxide). POLYMER 2003. [DOI: 10.1016/s0032-3861(03)00107-1] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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