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He W, Wang F, Qiang Y, Pan Y, Li W, Liu M. Asymmetric Binary Spherical Phases Self-Assembled by Mixing AB Diblock/ABC Triblock Copolymers. Macromolecules 2023. [DOI: 10.1021/acs.macromol.2c02217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Wangping He
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Feng Wang
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Yicheng Qiang
- Department of Macromolecular Science, Fudan University, Shanghai 200433, China
| | - Yuchao Pan
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Weihua Li
- State Key Laboratory of Molecular Engineering of Polymers, Key Laboratory of Computational Physical Sciences, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
| | - Meijiao Liu
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou 310018, China
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2
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Hybrid Time-Dependent Ginzburg–Landau Simulations of Block Copolymer Nanocomposites: Nanoparticle Anisotropy. Polymers (Basel) 2022; 14:polym14091910. [PMID: 35567080 PMCID: PMC9103753 DOI: 10.3390/polym14091910] [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: 03/14/2022] [Revised: 04/27/2022] [Accepted: 05/02/2022] [Indexed: 11/16/2022] Open
Abstract
Block copolymer melts are perfect candidates to template the position of colloidal nanoparticles in the nanoscale, on top of their well-known suitability for lithography applications. This is due to their ability to self-assemble into periodic ordered structures, in which nanoparticles can segregate depending on the polymer–particle interactions, size and shape. The resulting coassembled structure can be highly ordered as a combination of both the polymeric and colloidal properties. The time-dependent Ginzburg–Landau model for the block copolymer was combined with Brownian dynamics for nanoparticles, resulting in an efficient mesoscopic model to study the complex behaviour of block copolymer nanocomposites. This review covers recent developments of the time-dependent Ginzburg–Landau/Brownian dynamics scheme. This includes efforts to parallelise the numerical scheme and applications of the model. The validity of the model is studied by comparing simulation and experimental results for isotropic nanoparticles. Extensions to simulate nonspherical and inhomogeneous nanoparticles are discussed and simulation results are discussed. The time-dependent Ginzburg–Landau/Brownian dynamics scheme is shown to be a flexible method which can account for the relatively large system sizes required to study block copolymer nanocomposite systems, while being easily extensible to simulate nonspherical nanoparticles.
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3
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Sengupta R, Tikekar MD, Delaney KT, Villet MC, Fredrickson GH. Interfacial reaction-induced roughening in polymer thin films. SOFT MATTER 2022; 18:2936-2950. [PMID: 35348172 DOI: 10.1039/d2sm00150k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Reactive blending of immiscible polymers is an important process for synthesizing polymer blends with superior properties. We use a phase-field model to understand reaction dynamics and morphology evolution by diffusive transport in layered films of incompatible, end-reactive polymers. We thoroughly investigate this phenomenon over a large parameter space of interface shapes, layer thicknesses, reaction rates specified by a Damkohler number (Daf), and Flory-Huggins interaction parameter (χ), under static conditions with no external fields. For films of the same thickness, the dynamics of the system is not significantly influenced by the length of the film or the initial shape of the interface. The interface between the polymers is observed to roughen, leading to the formation of a spontaneous emulsion. The reaction progresses slower and the interface roughens later for thicker films, and systems with higher χ. Increasing Daf increases the reaction rate and hastens the onset of roughening. The quasi-static interfacial tension decreases with the extent of reaction, but does not become vanishingly small or negative at the onset of roughening. Simulations with reversible reactions and systems where only a fraction of the homopolymers have reactive end groups show that a critical diblock (reaction product) concentration exists, below which interfacial roughening and spontaneous emulsification is not observed. We also demonstrate that thermal fluctuations accelerate the onset of interfacial roughening, and help sustain the system in an emulsified state.
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Affiliation(s)
- Rajarshi Sengupta
- Materials Research Laboratory, University of California Santa Barbara, Santa Barbara, CA, USA.
| | - Mukul D Tikekar
- DSM Materials Science Center, Royal DSM, Geleen, The Netherlands
| | - Kris T Delaney
- Materials Research Laboratory, University of California Santa Barbara, Santa Barbara, CA, USA.
| | | | - Glenn H Fredrickson
- Materials Research Laboratory, University of California Santa Barbara, Santa Barbara, CA, USA.
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4
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Tikekar MD, Delaney KT, Villet MC, Tree DR, Fredrickson GH. A phase field model for dynamic simulations of reactive blending of polymers. SOFT MATTER 2022; 18:877-893. [PMID: 35005764 DOI: 10.1039/d1sm01686e] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
A facile way to generate compatibilized blends of immiscible polymers is through reactive blending of end-functionalized homopolymers. The reaction may be reversible or irreversible depending on the end-groups and is affected by the immiscibility and transport of the reactant homopolymers and the compatibilizing copolymer product. Here we describe a phase-field framework to model the combined dynamics of reaction kinetics, diffusion, and multi-component thermodynamics on the evolution of the microstructure and reaction rate in reactive blending. A density functional with no fitting parameters, which is obtained by adapting a framework of Uneyama and Doi and qualitatively agrees with self-consistent field theory, is used in a diffusive dynamics model. For a symmetric mixture of equal-length reactive polymers mixed in equal proportions, we find that depending on the Flory χ parameter, the microstructure of an irreversibly reacting blend progresses through a rich evolution of morphologies, including from two-phase coexistence to a homogeneous mixture, or a two-phase to three-phase coexistence transitioning to a homogeneous blend or a lamellar copolymer. The emergence of a three-phase region at high χ leads to a previously unreported reaction rate scaling. For a reversible reaction, we find that the equilibrium composition is a function of both the equilibrium constant for the reaction and the χ parameter. We demonstrate that phase-field models are an effective way to understand the complex interplay of thermodynamic and kinetic effects in a reacting polymer blend.
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Affiliation(s)
- Mukul D Tikekar
- Materials Research Laboratory, University of California, Santa Barbara, USA.
| | - Kris T Delaney
- Materials Research Laboratory, University of California, Santa Barbara, USA.
| | | | - Douglas R Tree
- Chemical Engineering Department, Brigham Young University, Provo, USA
| | - Glenn H Fredrickson
- Materials Research Laboratory, University of California, Santa Barbara, USA.
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5
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Diaz J, Pinna M, Zvelindovsky AV, Pagonabarraga I. Nematic Ordering of Anisotropic Nanoparticles in Block Copolymers. ADVANCED THEORY AND SIMULATIONS 2021. [DOI: 10.1002/adts.202100433] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Javier Diaz
- CECAM, Centre Européen de Calcul Atomique et Moléculaire École Polytechnique Fédérale de Lausanne 1015 Lausanne Switzerland
| | - Marco Pinna
- Centre for Computational Physics University of Lincoln Brayford Pool Lincoln LN6 7TS UK
| | | | - Ignacio Pagonabarraga
- CECAM, Centre Européen de Calcul Atomique et Moléculaire École Polytechnique Fédérale de Lausanne 1015 Lausanne Switzerland
- Departament de Física de la Matèria Condensada Universitat de Barcelona Barcelona 08028 Spain
- Universitat de Barcelona Institute of Complex Systems (UBICS) Universitat de Barcelona Barcelona 08028 Spain
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6
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Müller M, Abetz V. Nonequilibrium Processes in Polymer Membrane Formation: Theory and Experiment. Chem Rev 2021; 121:14189-14231. [PMID: 34032399 DOI: 10.1021/acs.chemrev.1c00029] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Porous polymer and copolymer membranes are useful for ultrafiltration of functional macromolecules, colloids, and water purification. In particular, block copolymer membranes offer a bottom-up approach to form isoporous membranes. To optimize permeability, selectivity, longevity, and cost, and to rationally design fabrication processes, direct insights into the spatiotemporal structure evolution are necessary. Because of a multitude of nonequilibrium processes in polymer membrane formation, theoretical predictions via continuum models and particle simulations remain a challenge. We compiled experimental observations and theoretical approaches for homo- and block copolymer membranes prepared by nonsolvent-induced phase separation and highlight the interplay of multiple nonequilibrium processes─evaporation, solvent-nonsolvent exchange, diffusion, hydrodynamic flow, viscoelasticity, macro- and microphase separation, and dynamic arrest─that dictates the complex structure of the membrane on different scales.
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Affiliation(s)
- Marcus Müller
- Georg-August Universität, Institut für Theoretische Physik, 37073 Göttingen, Germany
| | - Volker Abetz
- Helmholtz-Zentrum Hereon, Institut für Membranforschung, 21502 Geesthacht, Germany.,Universität Hamburg, Institut für Physikalische Chemie, 20146 Hamburg, Germany
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7
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Dau H, Keyes A, Basbug Alhan HE, Ordonez E, Tsogtgerel E, Gies AP, Auyeung E, Zhou Z, Maity A, Das A, Powers DC, Beezer DB, Harth E. Dual Polymerization Pathway for Polyolefin-Polar Block Copolymer Synthesis via MILRad: Mechanism and Scope. J Am Chem Soc 2020; 142:21469-21483. [PMID: 33290059 DOI: 10.1021/jacs.0c10588] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
This work explores the mechanism whereby a cationic diimine Pd(II) complex combines coordination insertion and radical polymerization to form polyolefin-polar block copolymers. The initial requirement involves the insertion of a single acrylate monomer into the Pd(II)-polyolefin intermediates, which generate a stable polymeric chelate through a chain-walking mechanism. This thermodynamically stable chelate was also found to be photochemically inactive, and a unique mechanism was discovered which allows for radical polymerization. Rate-determining opening of the chelate by an ancillary ligand followed by additional chain walking allows the metal to migrate to the α-carbon of the acrylate moiety. Ultimately, the molecular parameters necessary for blue-light-triggered Pd-C bond homolysis from this α-carbon to form a carbon-centered macroradical species were established. This intermediate is understood to initiate free radical polymerization of acrylic monomers, thereby facilitating block copolymer synthesis from a single Pd(II) complex. Key intermediates were isolated and comprehensively characterized through exhaustive analytical methods which detail the mechanism while confirming the structural integrity of the polyolefin-polar blocks. Chain walking combined with blue-light irradiation functions as the mechanistic switch from coordination insertion to radical polymerization. On the basis of these discoveries, robust di- and triblock copolymer syntheses have been demonstrated with olefins (ethylene and 1-hexene) which produce amorphous or crystalline blocks and acrylics (methyl acrylate, ethyl acrylate, n-butyl acrylate, and methyl methacrylate) in broad molecular weight ranges and compositions, yielding AB diblocks and BAB triblocks.
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Affiliation(s)
- Huong Dau
- Department of Chemistry, Center of Excellence in Polymer Chemistry (CEPC), University of Houston, 3585 Cullen Boulevard, Houston, Texas 77004, United States
| | - Anthony Keyes
- Department of Chemistry, Center of Excellence in Polymer Chemistry (CEPC), University of Houston, 3585 Cullen Boulevard, Houston, Texas 77004, United States
| | - Hatice E Basbug Alhan
- Department of Chemistry, Center of Excellence in Polymer Chemistry (CEPC), University of Houston, 3585 Cullen Boulevard, Houston, Texas 77004, United States
| | - Estela Ordonez
- Department of Chemistry, Center of Excellence in Polymer Chemistry (CEPC), University of Houston, 3585 Cullen Boulevard, Houston, Texas 77004, United States
| | - Enkhjargal Tsogtgerel
- Department of Chemistry, Center of Excellence in Polymer Chemistry (CEPC), University of Houston, 3585 Cullen Boulevard, Houston, Texas 77004, United States
| | - Anthony P Gies
- The Dow Chemical Company, Lake Jackson, Texas 77566, United States
| | - Evelyn Auyeung
- The Dow Chemical Company, Lake Jackson, Texas 77566, United States
| | - Zhe Zhou
- The Dow Chemical Company, Lake Jackson, Texas 77566, United States
| | - Asim Maity
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Anuvab Das
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - David C Powers
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Dain B Beezer
- Department of Chemistry, Center of Excellence in Polymer Chemistry (CEPC), University of Houston, 3585 Cullen Boulevard, Houston, Texas 77004, United States
| | - Eva Harth
- Department of Chemistry, Center of Excellence in Polymer Chemistry (CEPC), University of Houston, 3585 Cullen Boulevard, Houston, Texas 77004, United States
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8
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Diaz J, Pinna M, Zvelindovsky AV, Pagonabarraga I. Large scale three dimensional simulations of hybrid block copolymer/nanoparticle systems. SOFT MATTER 2019; 15:9325-9335. [PMID: 31687717 DOI: 10.1039/c9sm01760g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Block copolymer melts self-assemble in the bulk into a variety of nanostructures, making them perfect candidates to template the position of nanoparticles. The morphological changes of block copolymers are studied in the presence of a considerable filling fraction of colloids. Furthermore, colloids can be found to assemble into ordered hexagonally close-packed structures in a defined number of layers when softly confined within the phase-separated block copolymer. A high concentration of interface-compatible nanoparticles leads to complex long-lived block copolymer morphologies depending on the polymeric composition. Macrophase separation between the colloids and the block copolymer can be induced if colloids are unsolvable within the matrix. This leads to the formation of ellipsoid-shaped polymer-rich domains elongated along the direction perpendicular to the interface between block copolymer domains.
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Affiliation(s)
- Javier Diaz
- Centre for Computational Physics, University of Lincoln, Brayford Pool, Lincoln, LN6 7TS, UK. and CECAM, Centre Européen de Calcul Atomique et Moléculaire, École Polytechnique Fédérale de Lausanne, Batochime - Avenue Forel 2, 1015 Lausanne, Switzerland
| | - Marco Pinna
- Centre for Computational Physics, University of Lincoln, Brayford Pool, Lincoln, LN6 7TS, UK.
| | - Andrei V Zvelindovsky
- Centre for Computational Physics, University of Lincoln, Brayford Pool, Lincoln, LN6 7TS, UK.
| | - Ignacio Pagonabarraga
- CECAM, Centre Européen de Calcul Atomique et Moléculaire, École Polytechnique Fédérale de Lausanne, Batochime - Avenue Forel 2, 1015 Lausanne, Switzerland and Departament de Física de la Matéria Condensada, Universitat de Barcelona, Martíi Franqués 1, 08028 Barcelona, Spain. and Universitat de Barcelona Institute of Complex Systems (UBICS), Universitat de Barcelona, 08028 Barcelona, Spain
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9
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Santos AP, Pȩkalski J, Panagiotopoulos AZ. Thermodynamic signatures and cluster properties of self-assembly in systems with competing interactions. SOFT MATTER 2017; 13:8055-8063. [PMID: 29052681 DOI: 10.1039/c7sm01721a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Colloidal particles, amphiphiles and functionalized nanoparticles are examples of systems that frequently exhibit short-range attraction coupled with long-range repulsion. We vary the ratio of attraction and repulsion in a simple isotropic model with competing interactions, using molecular simulations, and observe significant differences in the properties of the self-assembled clusters that form. We report conditions that lead to the self-assembly of clusters of a preferred size, accompanied by a change in the slope of the pressure with respect to density, similar to micelles formed by amphiphilic molecules. We also report conditions where repulsion dominates, clusters of a preferred size form and the pressure vs. density slope is unaffected by self-assembly. We investigate cluster structure by calculating the size distributions, free colloid density, cluster shape and density profiles. The system dynamics are characterized by cluster life-times. We do not find qualitative differences in structure or dynamics of the clusters, regardless the pressure behavior. Therefore, thermodynamic and structural quantities are required to classify the different clustering characteristics that are observable in systems with competing interactions. Our results have implications in terms of development of design principles for stable cluster self-assembly.
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Affiliation(s)
- Andrew P Santos
- Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, USA.
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10
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11
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Phase behavior and interfacial properties of diblock copolymer-homopolymer ternary mixtures: Influence of volume fraction of copolymers and interaction energy. CHINESE JOURNAL OF POLYMER SCIENCE 2017. [DOI: 10.1007/s10118-017-1915-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Directed self-assembly of block copolymers by chemical or topographical guiding patterns: Optimizing molecular architecture, thin-film properties, and kinetics. Prog Polym Sci 2016. [DOI: 10.1016/j.progpolymsci.2015.10.008] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Liu M, Xia B, Li W, Qiu F, Shi AC. Self-Assembly of Binary Mesocrystals from Blends of BABCB Multiblock Copolymers and ABC Triblock Copolymers. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00529] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Meijiao Liu
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Polymers and Polymer Composite Materials, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
| | - Binkai Xia
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Polymers and Polymer Composite Materials, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
| | - Weihua Li
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Polymers and Polymer Composite Materials, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
| | - Feng Qiu
- State Key Laboratory of Molecular Engineering of Polymers, Collaborative Innovation Center of Polymers and Polymer Composite Materials, Department of Macromolecular Science, Fudan University, Shanghai 200433, China
| | - An-Chang Shi
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
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14
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Dehghan A, Shi AC. Modeling Hydrogen Bonding in Diblock Copolymer/Homopolymer Blends. Macromolecules 2013. [DOI: 10.1021/ma4008576] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ashkan Dehghan
- Department
of Physics and Astronomy, McMaster University,
Hamilton, Ontario, Canada
| | - An-Chang Shi
- Department
of Physics and Astronomy, McMaster University,
Hamilton, Ontario, Canada
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15
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Singh V, Khullar P, Dave PN, Kaur N. Micelles, mixed micelles, and applications of polyoxypropylene (PPO)-polyoxyethylene (PEO)-polyoxypropylene (PPO) triblock polymers. INTERNATIONAL JOURNAL OF INDUSTRIAL CHEMISTRY 2013. [DOI: 10.1186/2228-5547-4-12] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Abstract
This review gives a brief outline of various micellar properties of triblock polymers such as critical micellization concentration, critical micellization temperature, and microviscosity. Detailed discussion of the effect of temperature on micellar properties of various triblock polymer mixtures is given. Applications of triblock polymers in solubilization as drug delivery agents, as nano drug, for the synthesis of gold nanoparticles, for cobalt determination, etc. are discussed.
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Ahn H, Lee Y, Lee H, Park S, Kim Y, Cho J, Ryu DY. Microdomain expansion and transition behavior of PS-b-PMMA/PS homopolymers by SAXS analysis. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.08.055] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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17
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Tureau MS, Kuan WF, Rong L, Hsiao BS, Epps TH. Inducing Order from Disordered Copolymers: On Demand Generation of Triblock Morphologies Including Networks. Macromolecules 2012. [DOI: 10.1021/ma300365h] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Maëva S. Tureau
- Department
of Chemical and Biomolecular
Engineering, University of Delaware, Newark,
Delaware 19716, United States
| | - Wei-Fan Kuan
- Department
of Chemical and Biomolecular
Engineering, University of Delaware, Newark,
Delaware 19716, United States
| | - Lixia Rong
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794,
United States
| | - Benjamin S. Hsiao
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794,
United States
| | - Thomas H. Epps
- Department
of Chemical and Biomolecular
Engineering, University of Delaware, Newark,
Delaware 19716, United States
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SELF-ASSEMBLY OF SYMMETRIC DIBLOCK COPOLYMER/HOMOPOLYMER BLENDS CONFINED IN SPHERICAL NANOPORES. ACTA POLYM SIN 2011. [DOI: 10.3724/sp.j.1105.2011.11178] [Citation(s) in RCA: 2] [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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19
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Pike DQ, Müller M, de Pablo JJ. Monte-Carlo simulation of ternary blends of block copolymers and homopolymers. J Chem Phys 2011; 135:114904. [DOI: 10.1063/1.3638175] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Chantawansri TL, Duncan AJ, Ilavsky J, Stokes KK, Berg MC, Mrozek RA, Lenhart JL, Beyer FL, Andzelm JW. Phase behavior of SEBS triblock copolymer gels. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/polb.22335] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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21
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Tardani F, Masci G, La Mesa C. Block co-polymers undergoing supra-molecular association. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.04.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Holoubek J, Baldrian J, Hromádková J, Steinhart M. Self-assembled structures in polystyrene-block-polyisoprene-blend-polystyrene and polystyrene-block-poly(methyl methacrylate)-blend-polystyrene or -blend-poly(methyl methacrylate) in the strong segregation regime. POLYM INT 2010. [DOI: 10.1002/pi.2994] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Nedoma AJ, Lai P, Jackson A, Robertson ML, Balsara NP. Phase Behavior of Off-Critical A/B/A−C Blends. Macromolecules 2010. [DOI: 10.1021/ma101250e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alisyn J. Nedoma
- Department of Chemical Engineering, University of California, Berkeley, California 94720
| | - Peggy Lai
- Department of Chemical Engineering, University of California, Berkeley, California 94720
| | - Andrew Jackson
- National Institute of Standards and Technology Center for Neutron Research, Gaithersburg, Maryland 20899
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742
| | - Megan L. Robertson
- Department of Chemical Engineering, University of California, Berkeley, California 94720
| | - Nitash P. Balsara
- Department of Chemical Engineering, University of California, Berkeley, California 94720
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
- Environmental Energy Technologies Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
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Lefèvre N, Daoulas KC, Müller M, Gohy JF, Fustin CA. Self-Assembly in Thin Films of Mixtures of Block Copolymers and Homopolymers Interacting by Hydrogen Bonds. Macromolecules 2010. [DOI: 10.1021/ma100925c] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nathalie Lefèvre
- Institute of Condensed Matter and Nanosciences (IMCN), Bio- and Soft Matter (BSMA), Université catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium
| | - Kostas Ch. Daoulas
- Institut für Theoretische Physik, Georg-August-Universität, Friedrich-Hund-Platz, 37077 Göttingen, Germany
| | - Marcus Müller
- Institut für Theoretische Physik, Georg-August-Universität, Friedrich-Hund-Platz, 37077 Göttingen, Germany
| | - Jean-François Gohy
- Institute of Condensed Matter and Nanosciences (IMCN), Bio- and Soft Matter (BSMA), Université catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium
| | - Charles-André Fustin
- Institute of Condensed Matter and Nanosciences (IMCN), Bio- and Soft Matter (BSMA), Université catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium
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Bousquet A, Ibarboure E, Teran FJ, Ruiz L, Garay MT, Laza JM, Vilas JL, Papon E, Rodríguez-Hernández J. pH responsive surfaces with nanoscale topography. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.24076] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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26
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Lansalot M, Guillaneuf Y, Luneau B, Acerbis S, Dufils PE, Gaudel-Siri A, Gigmes D, Marque SRA, Tordo P, Bertin D. A Step Towards High-Molecular-Weight Living/Controlled Polystyrene Using SG1-Mediated Polymerization. MACROMOL REACT ENG 2010. [DOI: 10.1002/mren.200900074] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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27
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Riggleman RA, Fredrickson GH. Field-theoretic simulations in the Gibbs ensemble. J Chem Phys 2010; 132:024104. [DOI: 10.1063/1.3292004] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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28
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Gigmes D, Bertin D, Lefay C, Guillaneuf Y. Kinetic Modeling of Nitroxide-Mediated Polymerization: Conditions for Living and Controlled Polymerization. MACROMOL THEOR SIMUL 2009. [DOI: 10.1002/mats.200900019] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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29
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Chang K, Robertson ML, Hillmyer MA. Phase inversion in polylactide/soybean oil blends compatibilized by poly(isoprene-b-lactide) block copolymers. ACS APPLIED MATERIALS & INTERFACES 2009; 1:2390-2399. [PMID: 20355877 DOI: 10.1021/am900514v] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Renewable composites were prepared by melt blending of polylactide and soybean oil. The blend morphology was tuned by the addition of poly(isoprene-b-lactide) block copolymers. Due to the extreme difference in the viscosities of soybean oil and polylactide, a critical block copolymer composition was found to induce a phase inversion point at which the minor soybean oil phase became the matrix surrounding polylactide particles. This transition was due to the thermodynamic interactions between the block copolymer and the two phases and shear forces acting on the mixture during blending. The size of the soybean oil droplets in the polylactide matrix was also highly dependent on the block copolymer composition. In binary polylactide/soybean oil blends, there was a limiting concentration of soybean oil that could be incorporated into the polylactide matrix (6% of the total blend weight), which could be increased up to 20% by the addition of block copolymers.
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Affiliation(s)
- Kwanho Chang
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
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30
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Holoubek J, Baldrian J, Hromádková J, Steinhart M. Self-assembled structures in d
8
-polystyrene- block
-polyisoprene/polystyrene blends in the weak segregation regime: SAXS and TEM study. POLYM INT 2009. [DOI: 10.1002/pi.2589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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31
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Zhou J, Shi AC. Microphase separation induced by differential interactions in diblock copolymer/homopolymer blends. J Chem Phys 2009; 130:234904. [DOI: 10.1063/1.3153918] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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32
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Wang R, Li W, Luo Y, Li BG, Shi AC, Zhu S. Phase Behavior of Ternary Homopolymer/Gradient Copolymer Blends. Macromolecules 2009. [DOI: 10.1021/ma801398a] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rui Wang
- Department of Chemical & Biochemical Engineering, State Key Laboratory of Polymer Reaction Engineering, Zhejiang University, Hangzhou, Zhejiang, P.R. China 310017; Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4L7; and Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada L8S 4L7
| | - Weihua Li
- Department of Chemical & Biochemical Engineering, State Key Laboratory of Polymer Reaction Engineering, Zhejiang University, Hangzhou, Zhejiang, P.R. China 310017; Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4L7; and Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada L8S 4L7
| | - Yingwu Luo
- Department of Chemical & Biochemical Engineering, State Key Laboratory of Polymer Reaction Engineering, Zhejiang University, Hangzhou, Zhejiang, P.R. China 310017; Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4L7; and Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada L8S 4L7
| | - Bo-Geng Li
- Department of Chemical & Biochemical Engineering, State Key Laboratory of Polymer Reaction Engineering, Zhejiang University, Hangzhou, Zhejiang, P.R. China 310017; Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4L7; and Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada L8S 4L7
| | - An-Chang Shi
- Department of Chemical & Biochemical Engineering, State Key Laboratory of Polymer Reaction Engineering, Zhejiang University, Hangzhou, Zhejiang, P.R. China 310017; Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4L7; and Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada L8S 4L7
| | - Shiping Zhu
- Department of Chemical & Biochemical Engineering, State Key Laboratory of Polymer Reaction Engineering, Zhejiang University, Hangzhou, Zhejiang, P.R. China 310017; Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4L7; and Department of Chemical Engineering, McMaster University, Hamilton, Ontario, Canada L8S 4L7
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33
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Kim E, Ahn H, Ryu DY, Joo W, Kim JK, Jung J, Chang T. Closed-Loop Transition Induced by Homopolymers. Macromolecules 2008. [DOI: 10.1021/ma801530f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Eunhye Kim
- Department of Chemical Engineering, Yonsei University, Seoul 120-749, Korea, National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Pohang, Gyeongpuk 790-784, Korea, and Department of Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Gyeongpuk 790-784, Korea
| | - Hyungju Ahn
- Department of Chemical Engineering, Yonsei University, Seoul 120-749, Korea, National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Pohang, Gyeongpuk 790-784, Korea, and Department of Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Gyeongpuk 790-784, Korea
| | - Du Yeol Ryu
- Department of Chemical Engineering, Yonsei University, Seoul 120-749, Korea, National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Pohang, Gyeongpuk 790-784, Korea, and Department of Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Gyeongpuk 790-784, Korea
| | - Wonchul Joo
- Department of Chemical Engineering, Yonsei University, Seoul 120-749, Korea, National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Pohang, Gyeongpuk 790-784, Korea, and Department of Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Gyeongpuk 790-784, Korea
| | - Jin Kon Kim
- Department of Chemical Engineering, Yonsei University, Seoul 120-749, Korea, National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Pohang, Gyeongpuk 790-784, Korea, and Department of Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Gyeongpuk 790-784, Korea
| | - Jueun Jung
- Department of Chemical Engineering, Yonsei University, Seoul 120-749, Korea, National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Pohang, Gyeongpuk 790-784, Korea, and Department of Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Gyeongpuk 790-784, Korea
| | - Taihyun Chang
- Department of Chemical Engineering, Yonsei University, Seoul 120-749, Korea, National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Pohang, Gyeongpuk 790-784, Korea, and Department of Chemistry and Polymer Research Institute, Pohang University of Science and Technology, Gyeongpuk 790-784, Korea
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34
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Holoubek J, Baldrian J, Lednický F, Lal J. Self-assembled structures in blends of disordered and lamellar block copolymers: SAXS, SANS and TEM study. POLYM INT 2008. [DOI: 10.1002/pi.2496] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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35
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36
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Ye XG, Sun ZY, Li HF, An LJ, Tong Z. The phase behavior of comblike block copolymer Am+1Bm/homopolymer A mixtures. J Chem Phys 2008; 128:094903. [DOI: 10.1063/1.2835609] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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37
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Wanakule NS, Nedoma AJ, Robertson ML, Fang Z, Jackson A, Garetz BA, Balsara NP. Characterization of Micron-Sized Periodic Structures in Multicomponent Polymer Blends by Ultra-Small-Angle Neutron Scattering and Optical Microscopy. Macromolecules 2007. [DOI: 10.1021/ma701922y] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nisita S. Wanakule
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Othmer-Jacobs Department of Chemical & Biological Engineering, Polytechnic University, Brooklyn, New York 11201; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; Department of Chemical and Biological Sciences, Polytechnic University, Brooklyn, New York
| | - Alisyn J. Nedoma
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Othmer-Jacobs Department of Chemical & Biological Engineering, Polytechnic University, Brooklyn, New York 11201; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; Department of Chemical and Biological Sciences, Polytechnic University, Brooklyn, New York
| | - Megan L. Robertson
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Othmer-Jacobs Department of Chemical & Biological Engineering, Polytechnic University, Brooklyn, New York 11201; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; Department of Chemical and Biological Sciences, Polytechnic University, Brooklyn, New York
| | - Zhuangxi Fang
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Othmer-Jacobs Department of Chemical & Biological Engineering, Polytechnic University, Brooklyn, New York 11201; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; Department of Chemical and Biological Sciences, Polytechnic University, Brooklyn, New York
| | - Andrew Jackson
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Othmer-Jacobs Department of Chemical & Biological Engineering, Polytechnic University, Brooklyn, New York 11201; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; Department of Chemical and Biological Sciences, Polytechnic University, Brooklyn, New York
| | - Bruce A. Garetz
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Othmer-Jacobs Department of Chemical & Biological Engineering, Polytechnic University, Brooklyn, New York 11201; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; Department of Chemical and Biological Sciences, Polytechnic University, Brooklyn, New York
| | - Nitash P. Balsara
- Department of Chemical Engineering, University of California, Berkeley, California 94720; Othmer-Jacobs Department of Chemical & Biological Engineering, Polytechnic University, Brooklyn, New York 11201; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899; Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; Department of Chemical and Biological Sciences, Polytechnic University, Brooklyn, New York
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38
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Ji Y, Liang K, Ma J, Liang B. Morphologies of an Amphiphilic Diblock Copolymer of Poly (Ethylene Oxide)-b-Polystyrene and Its Blends with Poly (2,6-Dimethyl-1,4-Oxide). Polym Bull (Berl) 2007. [DOI: 10.1007/s00289-007-0865-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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39
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Guo H, Olvera de la Cruz M. A computer simulation study of the segregation of amphiphiles in binary immiscible matrices: short asymmetric copolymers in short homopolymers. J Chem Phys 2007; 123:174903. [PMID: 16375565 DOI: 10.1063/1.2084947] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The bulk and interfacial properties of ternary mixtures with asymmetric amphiphiles (A2B8) in A2 and B2 matrices and in A2 and B10 matrices are investigated by the dissipative particle dynamics type of molecular-dynamics simulations. The monomer concentrations of A2B8(phiA2B8) studied are below the critical micelle concentration (phiA2B8(cmc)) for the formation of micelles in the presence of an adsorbed amphiphilic monolayer at the interface. Macrophase separation from the mixed phase to the segregated state with A-rich and B-rich coexisting phases and the segregation of A2B8 at the interface are thermodynamically gradual but are accompanied by a pronounced stretching and orientation of the constituent chains. The segregation of A2B8 at the interface broadens the interfacial region and reduces the interfacial tension. The chain conformation of the asymmetric amphiphilic molecules and the interfacial properties are dominated by the majority block in the amphiphilic chain and dependent on the composition of the matrix in contact with the majority block. In the A2 and B2 matrices, the B8 blocks in A2B8 chains at the interface resemble a wet brush swollen by short B2 chains. Swelling is responsible for the pronounced stretching and orienting of the amphiphilic chains and the reduced interfacial amphiphile enrichment. At the same interfacial amphiphile excess, however, swollen amphiphiles are more efficient in reducing the interfacial tension than nonswollen amphiphiles.
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Affiliation(s)
- Hongxia Guo
- Department of Material Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA.
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40
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Klymko T, Subbotin A, ten Brinke G. Distribution of Homopolymer in Lamellar Self-Assembled Diblock Copolymer/Homopolymer Blends Involving Specific Interactions. Macromolecules 2007. [DOI: 10.1021/ma062527n] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- T. Klymko
- Laboratory of Polymer Chemistry and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands, and Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow 119991, Russia
| | - A. Subbotin
- Laboratory of Polymer Chemistry and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands, and Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow 119991, Russia
| | - G. ten Brinke
- Laboratory of Polymer Chemistry and Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands, and Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow 119991, Russia
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41
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Huang CI, Chiou YJ, Lan YK. Phase behavior of an amphiphilic molecule in the presence of two solvents by dissipative particle dynamics. POLYMER 2007. [DOI: 10.1016/j.polymer.2006.12.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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42
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Kim EY, Lee DJ, Kim JK, Cho J. Phase Behavior of a Binary Mixture of a Block Copolymer with Lower Disorder-to-Order Transition and a Homopolymer. Macromolecules 2006. [DOI: 10.1021/ma0617567] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eun Young Kim
- National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science & Technology, Kyungbuk 790-784, Korea
| | - Dong Jun Lee
- National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science & Technology, Kyungbuk 790-784, Korea
| | - Jin Kon Kim
- National Creative Research Initiative Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science & Technology, Kyungbuk 790-784, Korea
| | - Junhan Cho
- Department of Polymer Science and Engineering, Dankook University, Hyperstructured Organic Materials Research Center, Seoul 140-714, Korea
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43
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Holoubek J, Baldrian J, Lednický F, Málková Š, Lal J. Self-Assembled Structures in Blends of Block Copolymer A-block-B with Homopolymer A: SAXS and SANS Study. MACROMOL CHEM PHYS 2006. [DOI: 10.1002/macp.200600304] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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44
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Chang K, Morse DC. Diblock Copolymer Surfactants in Immiscible Homopolymer Blends: Swollen Micelles and Interfacial Tension. Macromolecules 2006. [DOI: 10.1021/ma060481s] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kwanho Chang
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
| | - David C. Morse
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
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45
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Komura S, Shimokawa N, Kato T. Unbinding and preunbinding in surfactant solutions. J Chem Phys 2006; 124:034906. [PMID: 16438613 DOI: 10.1063/1.2159475] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We propose models for the first-order unbinding transition of lyotropic lamellae in surfactant solutions. The coupling between the surfactant volume fraction and the elastic degree of freedom is considered so that the net attractive interaction between the surfactant molecules is enhanced. The elastic degree of freedom can be either (i) a membrane elastic degree of freedom or (ii) a bulk elastic degree of freedom. The phase behaviors of these two models are analyzed. For both cases, the unbinding transition becomes first order when the coupling is strong enough. We determine the associated preunbinding line which separates two lamellar phases having different repeat distances.
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Affiliation(s)
- S Komura
- Department of Chemistry, Faculty of Science, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
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46
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Epps TH, Chatterjee J, Bates FS. Phase Transformations Involving Network Phases in ISO Triblock Copolymer−Homopolymer Blends. Macromolecules 2005. [DOI: 10.1021/ma050736m] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas H. Epps
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
| | - Joon Chatterjee
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
| | - Frank S. Bates
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
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Abstract
In this era of portability and rapid technological advances, polymers are more than ever under pressure to be cheap and offer tailored property profiles. Often, the key lies in designing blends and alloys carefully structured at the appropriate scale (preferably less than a micrometre) from existing polymers. Block copolymers - two or more different polymer chains linked together - have long been thought to offer the solution. Local segregation of the different polymer blocks yields molecular-scale aggregates of nanometre size. Recent progress in synthetic chemistry has unveiled unprecedented opportunities to prepare tailored block copolymers at reasonable cost. Over twenty years of intense academic research and the advent of powerful statistical theories and computational methods should help predict the equilibrium and even non-equilibrium behaviour of copolymers and their blends with other polymers. The gap between block copolymer self-assembly and affordable nanostructured plastics endowed with still-unexplored combinations of properties is getting narrower.
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Affiliation(s)
- Anne-Valérie Ruzette
- Laboratoire Matière Molle et Chimie, ESPCI-CNRS (UMR 167), ESPCI, 10 rue Vauquelin, 75005 Paris, France.
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49
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Wu Y, Cheng G, Katsov K, Sides SW, Wang J, Tang J, Fredrickson GH, Moskovits M, Stucky GD. Composite mesostructures by nano-confinement. NATURE MATERIALS 2004; 3:816-822. [PMID: 15502836 DOI: 10.1038/nmat1230] [Citation(s) in RCA: 324] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2004] [Accepted: 08/18/2004] [Indexed: 05/24/2023]
Abstract
In a physically confined environment, interfacial interactions, symmetry breaking, structural frustration and confinement-induced entropy loss can play dominant roles in determining molecular organization. Here we present a systematic study of the confined assembly of silica-surfactant composite mesostructures within cylindrical nanochannels of varying diameters. Using exactly the same precursors and reaction conditions that form the two-dimensional hexagonal SBA-15 mesostructured thin film, unprecedented silica mesostructures with chiral mesopores such as single- and double-helical geometries spontaneously form inside individual alumina nanochannels. On tightening the degree of confinement, a transition is observed in the mesopore morphology from a coiled cylindrical to a spherical cage-like geometry. Self-consistent field calculations carried out to account for the observed mesostructures accord well with experiment. The mesostructures produced by confined syntheses are useful as templates for fabricating highly ordered mesostructured nanowires and nanowire arrays.
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Affiliation(s)
- Yiying Wu
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA
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50
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Gente G, Iovino A, La Mesa C. Supramolecular association of a triblock copolymer in water. J Colloid Interface Sci 2004; 274:458-64. [PMID: 15144817 DOI: 10.1016/j.jcis.2004.02.064] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2003] [Accepted: 02/26/2004] [Indexed: 10/26/2022]
Abstract
Solutions of a poly(oxyethylene)-poly(oxypropylene)-poly(oxyethylene) triblock copolymer, Pluronic F(68), were investigated in isothermal and isopleth mode. Surface tension, sigma, dynamic shear viscosity, n(omega), QELS experiments, and volumetric, colligative, and refractive index measurements characterize the system behavior in a wide range of compositions and temperatures. The thermodynamic properties associated with micelle formation, above the critical micellar temperature, were determined by different experimental methods. The large entropic contributions to the system stability are ascribed to significant dehydration of the oxypropylene portion in the copolymer, consequent to micelle formation. Temperature has a pronounced effect on the association features of F(68). It gives rise to abrupt changes in QELS and rheological properties when the critical micellar temperature is approached. Such effects are explained in terms of thermally driven micellization processes and interconnection between micelles.
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Affiliation(s)
- Giacomo Gente
- Dipartimento di Chimica, Università "La Sapienza," P. le A. Moro 5, 00185 Rome, Italy
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