1
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Esteban-Hofer L, Emmanouilidis L, Yulikov M, Allain FHT, Jeschke G. Ensemble structure of the N-terminal domain (1-267) of FUS in a biomolecular condensate. Biophys J 2024; 123:538-554. [PMID: 38279531 PMCID: PMC10938082 DOI: 10.1016/j.bpj.2024.01.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 11/06/2023] [Accepted: 01/22/2024] [Indexed: 01/28/2024] Open
Abstract
Solutions of some proteins phase separate into a condensed state of high protein concentration and a dispersed state of low concentration. Such behavior is observed in living cells for a number of RNA-binding proteins that feature intrinsically disordered domains. It is relevant for cell function via the formation of membraneless organelles and transcriptional condensates. On a basic level, the process can be studied in vitro on protein domains that are necessary and sufficient for liquid-liquid phase separation (LLPS). We have performed distance distribution measurements by electron paramagnetic resonance for 13 sections in an N-terminal domain (NTD) construct of the protein fused in sarcoma (FUS), consisting of the QGSY-rich domain and the RGG1 domain, in the denatured, dispersed, and condensed state. Using 10 distance distribution restraints for ensemble modeling and three such restraints for model validation, we have found that FUS NTD behaves as a random-coil polymer under good-solvent conditions in both the dispersed and condensed state. Conformation distribution in the biomolecular condensate is virtually indistinguishable from the one in an unrestrained ensemble, with the latter one being based on only residue-specific Ramachandran angle distributions. Over its whole length, FUS NTD is slightly more compact in the condensed than in the dispersed state, which is in line with the theory for random coils in good solvent proposed by de Gennes, Daoud, and Jannink. The estimated concentration in the condensate exceeds the overlap concentration resulting from this theory. The QGSY-rich domain is slightly more extended, slightly more hydrated, and has slightly higher propensity for LLPS than the RGG1 domain. Our results support previous suggestions that LLPS of FUS is driven by multiple transient nonspecific hydrogen bonding and π-sp2 interactions.
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Affiliation(s)
- Laura Esteban-Hofer
- ETH Zurich, Department of Chemistry and Applied Biosciences, Zurich, Switzerland
| | | | - Maxim Yulikov
- ETH Zurich, Department of Chemistry and Applied Biosciences, Zurich, Switzerland
| | | | - Gunnar Jeschke
- ETH Zurich, Department of Chemistry and Applied Biosciences, Zurich, Switzerland.
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2
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Carrick BR, Weigand S, Seitzinger CL, Lodge TP. Concentration and Temperature Dependence of the Interaction Parameter and Correlation Length for Poly(benzyl methacrylate) in Ionic Liquids. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c01365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Brian R. Carrick
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Steven Weigand
- Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States
| | - Claire L. Seitzinger
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Timothy P. Lodge
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
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3
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Slim AH, Shi WH, Safi Samghabadi F, Faraone A, Marciel AB, Poling-Skutvik R, Conrad JC. Electrostatic Repulsion Slows Relaxations of Polyelectrolytes in Semidilute Solutions. ACS Macro Lett 2022; 11:854-860. [PMID: 35758769 DOI: 10.1021/acsmacrolett.2c00213] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We investigate the structure and dynamics of unentangled semidilute solutions of sodium polystyrenesulfonate (NaPSS) using small-angle neutron scattering (SANS) and neutron spin-echo (NSE) spectroscopy. The effects of electrostatic interactions and chain structure are examined as a function of ionic strength and polymer concentration, respectively. The SANS profiles exhibit a characteristic structural peak, signature of polyelectrolyte solutions, that can be fit with a combination of a semiflexible chain with excluded volume interactions form factor and a polymer reference interaction site model (PRISM) structure factor. We confirm that electrostatic interactions vary with ionic strength across solutions with similar geometries. The segmental relaxations from NSE deviate from theoretical predictions from Zimm and exhibit two scaling behaviors, with the crossover between the two regimes taking place around the characteristic structural peak. The chain dynamics are suppressed across the length scale of the correlation blob, and inversely related to the structure factor. These observations suggest that the highly correlated nature of polyelectrolytes presents an additional energy barrier that leads to de Gennes narrowing behavior.
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Affiliation(s)
- Ali H Slim
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Winnie H Shi
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, Texas 77005, United States
| | - Farshad Safi Samghabadi
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
| | - Antonio Faraone
- National Institute of Standards and Technology Center for Neutron Research, Gaithersburg, Maryland 20899, United States
| | - Amanda B Marciel
- Department of Chemical and Biomolecular Engineering, Rice University, Houston, Texas 77005, United States
| | - Ryan Poling-Skutvik
- Department of Chemical Engineering, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Jacinta C Conrad
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204, United States
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4
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Morita T, Okada H, Yamada T, Hidaka R, Ueki T, Niitsuma K, Kitazawa Y, Watanabe M, Nishikawa K, Higashi K. A study combining magic-angle spinning NMR and small-angle X-ray scattering on the interaction in the mixture of poly(benzyl methacrylate) and ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide. Phys Chem Chem Phys 2022; 24:26575-26582. [DOI: 10.1039/d2cp02207a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Despite being an LCST system, the NMR results indicate that the number of ionic liquid ions interacting with the solute polymer increases even at temperatures approaching the separation line.
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Affiliation(s)
- Takeshi Morita
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba, 263-8522, Japan
| | - Hitomi Okada
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, 260-8675, Japan
| | - Taisei Yamada
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba, 263-8522, Japan
| | - Ryo Hidaka
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, 260-8675, Japan
| | - Takeshi Ueki
- Research Center for Functional Materials, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki, 305-0044, Japan
- Graduate School of Life Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Kazuyuki Niitsuma
- Department of Chemistry and Biotechnology, Yokohama National University, Yokohama, 240-8501, Japan
| | - Yuzo Kitazawa
- Department of Chemistry and Biotechnology, Yokohama National University, Yokohama, 240-8501, Japan
| | - Masayoshi Watanabe
- Department of Chemistry and Biotechnology, Yokohama National University, Yokohama, 240-8501, Japan
- Institute of Advanced Sciences, Yokohama National University, Yokohama, 240-8501, Japan
| | - Keiko Nishikawa
- Department of Chemistry, Graduate School of Science, Chiba University, Chiba, 263-8522, Japan
- Toyota Physical & Chemical Research Institute, Nagakute, Aichi, 480-1192, Japan
| | - Kenjirou Higashi
- Graduate School of Pharmaceutical Sciences, Chiba University, Chiba, 260-8675, Japan
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5
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Salatto D, Carrillo JMY, Endoh MK, Taniguchi T, Yavitt BM, Masui T, Kishimoto H, Tyagi M, Ribbe AE, Garcia Sakai V, Kruteva M, Sumpter BG, Farago B, Richter D, Nagao M, Koga T. Structural and Dynamical Roles of Bound Polymer Chains in Rubber Reinforcement. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01239] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Daniel Salatto
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Jan-Michael Y. Carrillo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Maya K. Endoh
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Takashi Taniguchi
- Graduate School of Engineering, Department of Chemical Engineering, Kyoto University, Katsura-Campus, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Benjamin M. Yavitt
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Tomomi Masui
- Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 671-0027, Japan
| | - Hiroyuki Kishimoto
- Sumitomo Rubber Industries Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 671-0027, Japan
| | - Madhusudan Tyagi
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
| | - Alexander E. Ribbe
- Department for Polymer Science & Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Victoria Garcia Sakai
- ISIS Pulsed Neutron and Muon Facility, Science and Technology Facilities Council Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, U.K
| | - Margarita Kruteva
- Jülich Centre for Neutron Science (JCNS), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - Bobby G. Sumpter
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bela Farago
- Institut Laue−Langevin, 6 rue Jules Horowitz, BP 156-38042, Grenoble Cedex 9 38000, France
| | - Dieter Richter
- Jülich Centre for Neutron Science (JCNS), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - Michihiro Nagao
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899-6102, United States
- Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, United States
- Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, United States
| | - Tadanori Koga
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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6
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Lopez CG, Horkay F, Mussel M, Jones RL, Richtering W. Screening lengths and osmotic compressibility of flexible polyelectrolytes in excess salt solutions. SOFT MATTER 2020; 16:7289-7298. [PMID: 32667374 PMCID: PMC8281568 DOI: 10.1039/d0sm00464b] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
We report results of small angle neutron scattering measurements made on sodium polystyrene sulfonate in aqueous salt solutions. The correlation length (ξ) and osmotic compressibility are measured as a function of polymer (c) and added salt (cS) concentrations, and the results are compared with scaling predictions and the random-phase approximation (RPA). In Dobrynin et al.'s scaling model the osmotic pressure consists of a counter-ion contribution and a polymer contribution. The polymer contribution is found to be two orders of magnitude smaller than expected from the scaling model, in agreement with earlier observations made on neutral polymers in good solvent condition. RPA allows the determination of single-chain dimensions in semidilute solutions at high polymer and added salt concentrations, but fails for cS≤ 2 M. The χ parameter can be modelled as the sum of an intrinsic contribution (χ0) and an electrostatic term: χ∼χ0 + K'/√cS, where χ0 > 0.5 is consistent with the hydrophobic nature of the backbone of NaPSS. The dependence of χelec∼ 1/√cS disagrees with the random-phase approximation (χelec∼ 1/cs), but agrees with the light scattering results in dilute solution and Dobrynin et al.'s scaling treatment of electrostatic excluded volume.
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Affiliation(s)
- Carlos G Lopez
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany.
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7
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Zhang X, Duan X, Muzychka Y, Wang Z. Experimental correlation for pipe flow drag reduction using relaxation time of linear flexible polymers in a dilute solution. CAN J CHEM ENG 2019. [DOI: 10.1002/cjce.23649] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Xin Zhang
- Department of Mechanical Engineering, Faculty of Engineering and Applied ScienceMemorial University of Newfoundland St. John's Newfoundland Canada
| | - Xili Duan
- Department of Mechanical Engineering, Faculty of Engineering and Applied ScienceMemorial University of Newfoundland St. John's Newfoundland Canada
| | - Yuri Muzychka
- Department of Mechanical Engineering, Faculty of Engineering and Applied ScienceMemorial University of Newfoundland St. John's Newfoundland Canada
| | - Zongming Wang
- Department of Chemical Equipment and Control Engineering, College of Chemical EngineeringChina University of Petroleum Qingdao P. R. China
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8
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Koga T, Barkley D, Nagao M, Taniguchi T, Carrillo JMY, Sumpter BG, Masui T, Kishimoto H, Koga M, Rudick JG, Endoh MK. Interphase Structures and Dynamics near Nanofiller Surfaces in Polymer Solutions. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01615] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
| | | | - Michihiro Nagao
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6102, United States
- Center for Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47408, United States
| | - Takashi Taniguchi
- Graduate School of Engineering, Department of Chemical Engineering, Kyoto University, Katsura Campus, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Jan-Michael Y. Carrillo
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bobby G. Sumpter
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Tomomi Masui
- Sumitomo Rubber
Industries
Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 671-0027, Japan
| | - Hiroyuki Kishimoto
- Sumitomo Rubber
Industries
Ltd., 1-1, 2-chome, Tsutsui-cho, Chuo-ku, Kobe 671-0027, Japan
| | - Maho Koga
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, New York 14853, United States
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9
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Multiphasic effect of vinyl pyrrolidone polymers on amyloidogenesis, from macromolecular crowding to inhibition. Biochem J 2018; 475:3417-3436. [DOI: 10.1042/bcj20180715] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 10/02/2018] [Accepted: 10/04/2018] [Indexed: 11/17/2022]
Abstract
Deposition of misfolded amyloid polypeptides, associated with cell death, is the hallmark of many degenerative diseases (e.g. type II diabetes mellitus and Alzheimer's disease). In vivo, cellular and extracellular spaces are occupied by a high volume fraction of macromolecules. The resulting macromolecular crowding energetically affects reactions. Amyloidogenesis can either be promoted by macromolecular crowding through the excluded volume effect or inhibited due to a viscosity increase reducing kinetics. Macromolecular crowding can be mimicked in vitro by the addition of non-specific polymers, e.g. Ficoll, dextran and polyvinyl pyrrolidone (PVP), the latter being rarely used to study amyloid systems. We investigated the effect of PVP on amyloidogenesis of full-length human islet amyloid polypeptide (involved in type II diabetes) using fibrillisation and surface activity assays, ELISA, immunoblot and microscale thermophoresis. We demonstrate that high molecular mass PVP360 promotes amyloidogenesis due to volume exclusion and increase in effective amyloidogenic monomer concentration, like other crowders, but without the confounding effects of viscosity and surface activity. Interestingly, we also show that low molecular mass PVP10 has unique inhibitory properties as inhibition of fibril elongation occurs mainly in the bulk solution and is due to PVP10 directly and strongly interacting with amyloid species rather than the increase in viscosity typically associated with macromolecular crowding. In vivo, amyloidogenesis might be affected by the properties and proximity of endogenous macromolecular crowders, which could contribute to changes in associated pathogenesis. More generally, the PVP10 molecular backbone could be used to design small compounds as potential inhibitors of toxic species formation.
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10
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Conformational Transitions of Polymer Chains in Solutions Characterized by Fluorescence Resonance Energy Transfer. Polymers (Basel) 2018; 10:polym10091007. [PMID: 30960932 PMCID: PMC6404087 DOI: 10.3390/polym10091007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 09/07/2018] [Accepted: 09/07/2018] [Indexed: 11/30/2022] Open
Abstract
The critical overlap concentration C* is an important concept in polymer solutions and is defined as the boundary between dilute and semidilute regimes. In this study, the chain conformational changes of polystyrene (PS) with both high (Mn = 200,000 Da) and low (Mn = 13,000 Da) molecular weights in cis-decalin were compared by intrachain fluorescence resonance energy transfer (FRET). The random labeling of donor and acceptor chromophores strategy was employed for long PS chains, whereas chain-end labeling was used for short PS chains. By monitoring the spectroscopic intensity ratio between acceptor and donor, the concentration dependence on chain conformation from dilute to semidilute solutions was determined. Both long and short chains exhibit a conformational transition concentration, above which the polymer chains begin to collapse with concentration significantly. Interestingly, for randomly labeled polymer long chains, such concentration is consistent with C* determined from the viscosity result, below which only slight conformational change of polymer chain takes place. However, for the chain-end labeled short chain, the conformational transition concentration takes place earlier than C*, below which no significant polymer conformation change is observed.
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11
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Jouault N, Kumar SK, Smalley RJ, Chi C, Moneta R, Wood B, Salerno H, Melnichenko YB, He L, Guise WE, Hammouda B, Crawford MK. Do Very Small POSS Nanoparticles Perturb s-PMMA Chain Conformations? Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00432] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Nicolas Jouault
- Sorbonne Université, CNRS, Laboratoire Physicochimie des Electrolytes et des Nanosystèmes InterfaciauX, PHENIX F-75005 Paris, France
| | - Sanat K. Kumar
- Department of Chemical Engineering, Columbia University, New York, New York 10027, United States
| | - Robert J. Smalley
- DuPont Central
Research
and Development, E400/5424, Wilmington, Delaware 19880-0400, United States
| | - Changzai Chi
- DuPont Central
Research
and Development, E400/5424, Wilmington, Delaware 19880-0400, United States
| | - Robert Moneta
- DuPont Central
Research
and Development, E400/5424, Wilmington, Delaware 19880-0400, United States
| | - Barbara Wood
- DuPont Central
Research
and Development, E400/5424, Wilmington, Delaware 19880-0400, United States
| | - Holly Salerno
- DuPont Central
Research
and Development, E400/5424, Wilmington, Delaware 19880-0400, United States
| | - Yuri B. Melnichenko
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, United States
| | - Lilin He
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6393, United States
| | - William E. Guise
- DuPont Central
Research
and Development, E400/5424, Wilmington, Delaware 19880-0400, United States
- Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Lemont, Illinois 60439, United States
| | - Boualem Hammouda
- NIST Center for Neutron
Research, Gaithersburg, Maryland 20879-8562, United States
| | - Michael K. Crawford
- DuPont Central
Research
and Development, E400/5424, Wilmington, Delaware 19880-0400, United States
- Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, United States
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12
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Sutisna B, Polymeropoulos G, Musteata V, Sougrat R, Smilgies DM, Peinemann KV, Hadjichristidis N, Nunes SP. Functionalized Nanochannels from Self-Assembled and Photomodified Poly(Styrene-b-Butadiene-b-Styrene). SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:e1701885. [PMID: 28977736 DOI: 10.1002/smll.201701885] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 07/21/2017] [Indexed: 06/07/2023]
Abstract
Membranes are prepared by self-assembly and casting of 5 and 13 wt% poly(styrene-b-butadiene-b-styrene) (PS-b-PB-b-PS) copolymers solutions in different solvents, followed by immersion in water or ethanol. By controlling the solution-casting gap, porous films of 50 and 1 µm thickness are obtained. A gradient of increasing pore size is generated as the distance from the surface increased. An ordered porous surface layer with continuous nanochannels can be observed. Its formation is investigated, by using time-resolved grazing incident small angle X-ray scattering, electron microscopy, and rheology, suggesting a strong effect of the air-solution interface on the morphology formation. The thin PS-b-PB-b-PS ordered films are modified, by promoting the photolytic addition of thioglycolic acid to the polybutadiene groups, adding chemical functionality and specific transport characteristics on the preformed nanochannels, without sacrificing the membrane morphology. Photomodification increases fivefold the water permeance to around 2 L m-2 h-1 bar-1 , compared to that of the unmodified one. A rejection of 74% is measured for methyl orange in water. The membranes fabrication with tailored nanochannels and chemical functionalities can be demonstrated using relatively lower cost block copolymers. Casting on porous polyacrylonitrile supports makes the membranes even more scalable and competitive in large scale.
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Affiliation(s)
- Burhannudin Sutisna
- Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - George Polymeropoulos
- Physical Science and Engineering Division (PSE), KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Valentina Musteata
- Biological and Environmental Science and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Rachid Sougrat
- Advanced Nanofabrication Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Detlef-M Smilgies
- Cornell High Energy Synchrotron Source (CHESS), Wilson Laboratory, Cornell University, Ithaca, NY, 14853, USA
| | - Klaus-Viktor Peinemann
- Physical Science and Engineering Division (PSE), Advanced Membranes and Porous Materials Center (AMPMC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Nikolaos Hadjichristidis
- Physical Science and Engineering Division (PSE), KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Suzana P Nunes
- Biological and Environmental Science and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
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13
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Sheridan RJ, Orski SV, Jones RL, Satija SK, Beers KL. Surface interaction parameter measurement of solvated polymers via model end-tethered chains. Macromolecules 2017; 50:6668-6678. [PMID: 28970637 DOI: 10.1021/acs.macromol.7b00639] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present a method for the direct measurement of the relative energy of interaction between a solvated polymer and a solid interface. By tethering linear chains covalently to the surface, we ensured the idealized and constant configuration of polymer molecules for measurement, modeling, and parameter estimation. For the case of amine-terminated polystyrene bound to a glycidoxypropyl silane film submerged in cyclohexane-d12, we estimated the χ parameter for the temperature range 10.7 °C to 52.0 °C, and found a downward sloping trend that crosses the χ = 0.5 threshold at 37 °C to 40 °C, in agreement with solution estimates for the same system. We simultaneously estimated the surface interaction parameter χs at each temperature, finding a decreasing affinity of the chains for the surface with increasing temperature, consistent with empirical observations. The theoretical model shows some limitations in a stronger solvent (toluene-d8) that prevent rigorous parameter estimation, but we demonstrate a qualitative change in χ and χs towards stronger solvency and weaker surface interaction with increasing temperature.
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Affiliation(s)
- Richard J Sheridan
- Material Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD
| | - Sara V Orski
- Material Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD
| | - Ronald L Jones
- Material Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD
| | - Sushil K Satija
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD
| | - Kathryn L Beers
- Material Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD
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14
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Schwahn D, Pipich V. Aqueous Solutions of Poly(ethylene oxide): Crossover from Ordinary to Tricritical Behavior. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01466] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dietmar Schwahn
- Forschungs-Neutronenquelle
Heinz Maier-Leibnitz (FRMII), Technische Universität München, D-85748 Garching, Germany
| | - Vitaliy Pipich
- Outstation
at FRM II, Jülich Centre for Neutron Science JCNS-FRM II, Lichtenbergstrasse 1, D-85747 Garching, Germany
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15
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Moghaddam SZ, Thormann E. Hofmeister effect on thermo-responsive poly(propylene oxide): Role of polymer molecular weight and concentration. J Colloid Interface Sci 2015; 465:67-75. [PMID: 26641567 DOI: 10.1016/j.jcis.2015.11.040] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Revised: 11/17/2015] [Accepted: 11/18/2015] [Indexed: 10/22/2022]
Abstract
Although a vast amount of research has been dedicated to investigate the Hofmeister effect on the stability of polymer solutions, a clear understanding of the role of polymer properties in this phenomenon is still missing. Here, the Hofmeister effect of NaCl (destabilizing) and NaSCN (stabilizing) salts on aqueous solutions of poly(propylene oxide) (PPO) is studied. Four different molecular weights of PPO were investigated, to determine how the variation in the polymer coil size affects the Hofmeister effect. The investigation was further conducted for different PPO concentrations, in order to understand the effect of inter-chain interactions on the response to addition of salt. The temperature-driven phase separation of the solutions was monitored by differential scanning calorimetry, which provides the precise value of the phase separation temperature, as well as the enthalpy change accompanied with the transition. It was observed that increasing the molecular weight weakens the effect of the both salts, which is interpreted in terms of a scaling law between the molecular weight and the accessible surface area of the polymers. Increasing the PPO concentration further diminished the NaCl effect, but amplified the NaSCN effect. This difference is attributed to an electrostatic stabilization mechanism in the case of NaSCN.
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Affiliation(s)
| | - Esben Thormann
- Department of Chemistry, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
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16
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Dattani R, Cabral JT. Polymer fullerene solution phase behaviour and film formation pathways. SOFT MATTER 2015; 11:3125-3131. [PMID: 25739808 DOI: 10.1039/c5sm00053j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the phase behaviour of polymer/fullerene/solvent ternary mixtures and its consequence for the morphology of the resulting composite thin films. We focus particularly on solutions of polystyrene (PS), C60 fullerene and toluene, which are examined by static and dynamic light scattering, and films obtained from various solution ages and thermal annealing conditions, using atomic force and light microscopy. Unexpectedly, the solution phase behaviour below the polymer overlap concentration, c*, is found to be described by a simple excluded volume argument (occupied by the polymer chains) and the neat C60/solvent miscibility. Scaling consistent with full exclusion is found when the miscibility of the fullerene in the solvent is much lower than that of the polymer, giving way to partial exclusion with more soluble fullerenes (phenyl-C61-butyric acid methyl ester, PCBM) and a less asymmetric solvent (chlorobenzene), employed in photovoltaic devices. Spun cast and drop cast films were prepared from PS/C60/toluene solutions across the phase diagram to yield an identical PS/C60 composition and film thickness, resulting in qualitatively different morphologies in agreement with our measured solution phase boundaries. Our findings are relevant to the solution processing of polymer/fullerene composites (including organic photovoltaic devices), which generally require effective solubilisation of fullerene derivatives and polymer pairs in this concentration range, and the design of well-defined thin film morphologies.
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Affiliation(s)
- Rajeev Dattani
- Department of Chemical Engineering, Centre for Plastic Electronics, Imperial College London, London, SW7 2AZ, UK.
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17
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Foteinopoulou K, Karayiannis NC, Laso M. Monte Carlo simulations of densely-packed athermal polymers in the bulk and under confinement. Chem Eng Sci 2015. [DOI: 10.1016/j.ces.2014.08.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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18
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Lee S, Lee H, Thieu L, Jeong Y, Chang T, Fu C, Zhu Y, Wang Y. HPLC Characterization of Hydrogenous Polystyrene-block-deuterated polystyrene Utilizing the Isotope Effect. Macromolecules 2013. [DOI: 10.1021/ma4018247] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sanghoon Lee
- Division of Advanced Materials Science and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea
| | - Hyojoon Lee
- Division of Advanced Materials Science and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea
| | - Lam Thieu
- Division of Advanced Materials Science and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea
| | - Youncheol Jeong
- Division of Advanced Materials Science and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea
| | - Taihyun Chang
- Division of Advanced Materials Science and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea
| | - Chao Fu
- State Key Laboratory of Polymer
Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
| | - Yutian Zhu
- State Key Laboratory of Polymer
Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People’s Republic of China
| | - Yongmei Wang
- Department of Chemistry, The University of Memphis, Memphis, Tennessee 38152-3550, Unitied States
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20
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Wang D, Yuan Y, Mardiyati Y, Bubeck C, Koynov K. From Single Chains to Aggregates, How Conjugated Polymers Behave in Dilute Solutions. Macromolecules 2013. [DOI: 10.1021/ma4011523] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dapeng Wang
- Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz,
Germany
| | - Yuan Yuan
- Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz,
Germany
| | - Yati Mardiyati
- Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz,
Germany
| | - Christoph Bubeck
- Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz,
Germany
| | - Kaloian Koynov
- Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz,
Germany
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21
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Comprehensive two-dimensional liquid chromatography for the separation of protonated and deuterated polystyrene. J Chromatogr A 2012; 1265:95-104. [DOI: 10.1016/j.chroma.2012.09.088] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Revised: 09/20/2012] [Accepted: 09/24/2012] [Indexed: 11/20/2022]
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22
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Ikeda S, Zhong Q. Polymer and colloidal models describing structure-function relationships. Annu Rev Food Sci Technol 2012; 3:405-24. [PMID: 22136127 DOI: 10.1146/annurev-food-022811-101250] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Colloidal and polymer systems are not only abundant in food but also useful for gaining insights into structure-function relationships of food. Colloid and polymer systems are composed of mesoscopic scale particles dispersed in a liquid. Because of a relatively small potential barrier against aggregation between mesoscopic particles, a small change in temperature, pH, or chemical compositions can trigger aggregation and induce remarkable changes in structure and function of colloidal and polymer systems. An aggregated state is not normally an equilibrium state but a kinetically trapped state also called a jammed state. Various kinetic factors in food processing, such as the rate of changes in temperature, water content, and chemical compositions, must be taken into account to establish a complete state diagram of colloid- and polymer-based food systems.
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Affiliation(s)
- Shinya Ikeda
- Department of Food Science and Technology, The University of Tennessee, Knoxville, Tennessee 37996, USA
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23
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Callister S, Keller A, Hikmet RM. On thermoreversible gels: Their classification, relation to phase transitions and vitrification, their morphology and properties. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19900390104] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Kim Y, Ahn S, Chang T. Isotopic Effect in the Separation of Polystyrene by Normal Phase and Reversed Phase Liquid Chromatography. Anal Chem 2010; 82:1509-14. [DOI: 10.1021/ac902622t] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Youngtak Kim
- Department of Chemistry and Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea
| | - Seonyoung Ahn
- Department of Chemistry and Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea
| | - Taihyun Chang
- Department of Chemistry and Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea
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25
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26
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Cherdhirankorn T, Best A, Koynov K, Peneva K, Muellen K, Fytas G. Diffusion in polymer solutions studied by fluorescence correlation spectroscopy. J Phys Chem B 2009; 113:3355-9. [PMID: 19228045 DOI: 10.1021/jp809707y] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We employed fluorescence correlation spectroscopy (FCS) to study the diffusion of molecular and macromolecular tracers in polystyrene solutions over a broad range of concentrations (c) and molecular weights (M(w,m)) of the matrix polymer. Molecular tracer diffusion scales only with the matrix concentration and superimposes on a single, nonpolymer specific, curve. On the contrary, the diffusion of macromolecular tracers in solutions of matrix polymers with M(w,m) sufficiently larger than the tracer molecular weight scales with c/c(p)*, where c(p)* is the tracer overlap concentration. We further demonstrate that FCS can address local and global dynamics simultaneously.
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Mutch KJ, van Duijneveldt JS, Eastoe J, Grillo I, Heenan RK. Testing the scaling behavior of microemulsion-polymer mixtures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:3944-3952. [PMID: 19007255 DOI: 10.1021/la802488f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The phase behavior and structural properties of "protein limit" mixtures of small (radius 20-30 A) water-in-oil microemulsion droplets (colloids) and large (radius 130-580 A) nonadsorbing polymer chains have been investigated. Accepted theoretical scaling relations for describing correlations have been applied and do not account fully for the observations; solvency effects may account for the deviations. The polymer/colloid size ratio has been varied from around 4 to 19 by using three different molecular weights of polyisoprene. Small-angle neutron scattering (SANS) has been used to determine partial structure factors (PSF) through contrast variation. The structure factors describing colloid-colloid interactions for the three polymers at fixed polymer concentration are shown to exhibit the same scaling behavior as the phase boundaries, provided that samples are sufficiently far from the demixing phase transition. The structure factors show a dramatic increase at low wavevectors on approaching the phase boundary, and behavior in this region does not obey expected scaling relations. By calculating effective polymer Flory-Huggins parameters, the effect of apparent solvent properties on adding microemulsion are shown to be less dramatic for the higher molecular weight polymers. This study extends previous work carried out on microemulsion-polymer mixtures.
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Affiliation(s)
- Kevin J Mutch
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom, Institut Max-Von-Laue-Paul-Langevin, BP 156-X, F-38042 Grenoble Cedex, France
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28
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Foteinopoulou K, Karayiannis NC, Laso M, Kröger M, Mansfield ML. Universal scaling, entanglements, and knots of model chain molecules. PHYSICAL REVIEW LETTERS 2008; 101:265702. [PMID: 19437651 DOI: 10.1103/physrevlett.101.265702] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
By identifying the maximally random jammed state of freely jointed chains of tangent hard spheres we are able to determine the distinct scaling regimes characterizing the dependence of chain dimensions and topology on volume fraction. Calculated distributions of (i) the contour length of the primitive paths and (ii) the number of entanglements per chain agree remarkably well with recent theoretical predictions in all scaling regimes. Furthermore, our simulations reveal a hitherto unsuspected connection between purely intramolecular (knots) and intermolecular (entanglements) topological constraints.
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Affiliation(s)
- Katerina Foteinopoulou
- Institute for Optoelectronics and Microsystems, Universidad Politécnica de Madrid, José Gutiérrez Abascal 2, 28006 Madrid, Spain
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29
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Dumetz AC, Lewus RA, Lenhoff AM, Kaler EW. Effects of ammonium sulfate and sodium chloride concentration on PEG/protein liquid-liquid phase separation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:10345-10351. [PMID: 18702478 DOI: 10.1021/la801180n] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
When added to protein solutions, poly(ethylene glycol) (PEG) creates an effective attraction between protein molecules due to depletion forces. This effect has been widely used to crystallize proteins, and PEG is among the most successful crystallization agents in current use. However, PEG is almost always used in combination with a salt at either low or relatively high concentrations. Here the effects of sodium chloride and ammonium sulfate concentration on PEG 8000/ovalbumin liquid-liquid (L-L) phase separation are investigated. At low salt the L-L phase separation occurs at decreasing protein concentration with increasing salt concentration, presumably due to repulsive electrostatic interactions between proteins. At high salt concentration, the behavior depends on the nature of the salt. Sodium chloride has little effect on the L-L phase separation, but ammonium sulfate decreases the protein concentration at which the L-L phase separation occurs. This trend is attributed to the effects of critical fluctuations on depletion forces. The implications of these results for designing solution conditions optimal for protein crystallization are discussed.
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Affiliation(s)
- André C Dumetz
- Center for Molecular and Engineering Thermodynamics, Department of Chemical Engineering, University of Delaware, Newark, DE 19716, USA
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30
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Laso M, Karayiannis NC. Flexible chain molecules in the marginal and concentrated regimes: universal static scaling laws and cross-over predictions. J Chem Phys 2008; 128:174901. [PMID: 18465938 DOI: 10.1063/1.2912189] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We present predictions for the static scaling exponents and for the cross-over polymer volumetric fractions in the marginal and concentrated solution regimes. Corrections for finite chain length are made. Predictions are based on an analysis of correlated fluctuations in density and chain length, in a semigrand ensemble in which mers and solvent sites exchange identities. Cross-over volumetric fractions are found to be chain length independent to first order, although reciprocal-N corrections are also estimated. Predicted scaling exponents and cross-over regimes are compared with available data from extensive off-lattice Monte Carlo simulations [Karayiannis and Laso, Phys. Rev. Lett. 100, 050602 (2008)] on freely jointed, hard-sphere chains of average lengths from N=12-500 and at packing densities from dilute ones up to the maximally random jammed state.
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Affiliation(s)
- Manuel Laso
- Institute for Optoelectronics and Microsystems (ISOM), UPM José Gutiérrez Abascal 2, E-28006 Madrid, Spain.
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31
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Johnston‐Hall G, Monteiro MJ. Bimolecular radical termination: New perspectives and insights. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.22684] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Geoffrey Johnston‐Hall
- Australian Institute for Bioengineering and Nanotechnology, University of Queensland, Brisbane QLD 4072, Australia
| | - Michael J. Monteiro
- Australian Institute for Bioengineering and Nanotechnology, University of Queensland, Brisbane QLD 4072, Australia
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32
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Mutch KJ, Duijneveldt JSV, Eastoe J, Grillo I, Heenan RK. Small-angle neutron scattering study of microemulsion-polymer mixtures in the protein limit. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:3053-3060. [PMID: 18275227 DOI: 10.1021/la702913y] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Contrast variation small-angle neutron scattering (SANS) has been employed to study complex fluids comprising model microemulsions and polymers. The systems are water-in-oil microemulsions with added non-adsorbing polymer, under good polymer solvency conditions and semidilute polymer concentrations. The polymer/colloid size ratio was q approximately 11, which is well within the "protein limit". Four scattering contrasts were produced by selective deuteration of the dispersed and continuous phases and also the surfactant. In this way, the separate partial structure factors (PSF) for colloid-colloid (c-c), polymer-polymer (p-p), and colloid-polymer (c-p) have been obtained. The c-c PSF has been compared with theoretical predictions, allowing determination of a polymer correlation length. This is compared with a similar correlation length obtained from the p-p PSF, which is shown to increase with colloid concentration. In this sense, adding microemulsion has a similar effect on the dissolved polymer as reducing the solvent quality, and an effective Flory-Huggins chi parameter has been calculated. The cross-term PSF shows a distinct anti-correlation. This is the first time such structure factors have been determined experimentally for colloid-polymer systems in the protein limit and these allow a more detailed understanding of the structural interactions in these systems.
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Affiliation(s)
- Kevin J Mutch
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom, Institut Max-Von-Laue-Paul-Langevin, BP 156-X, F-38042 Grenoble Cedex, France
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33
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Johnston-Hall G, Monteiro MJ. Diffusion Controlled Termination of Linear Polystyrene Radicals in Linear, 4-Arm, and 6-Arm Star Polymer Matrices in Dilute, Semidilute, and Concentrated Solution Conditions. Macromolecules 2008. [DOI: 10.1021/ma702569m] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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34
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35
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Neutron spin echo studies on the segmental dynamics of macromolecules. ACTA ACUST UNITED AC 2007. [DOI: 10.1007/bfb0107914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/09/2023]
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36
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Johnston-Hall G, Stenzel MH, Davis TP, Barner-Kowollik C, Monteiro MJ. Chain Length Dependent Termination Rate Coefficients of Methyl Methacrylate (MMA) in the Gel Regime: Accessing kti,i Using Reversible Addition-Fragmentation Chain Transfer (RAFT) Polymerization. Macromolecules 2007. [DOI: 10.1021/ma062405v] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Geoffrey Johnston-Hall
- Australian Institute of Bioengineering and Nanotechnology, School of Molecular and Microbial Sciences, University of Queensland, Brisbane QLD 4072, Australia, and Centre for Advanced Macromolecular Design, School of Chemical Sciences and Engineering, the University of New South Wales, Sydney, NSW 2052, Australia
| | - Martina H. Stenzel
- Australian Institute of Bioengineering and Nanotechnology, School of Molecular and Microbial Sciences, University of Queensland, Brisbane QLD 4072, Australia, and Centre for Advanced Macromolecular Design, School of Chemical Sciences and Engineering, the University of New South Wales, Sydney, NSW 2052, Australia
| | - Thomas P. Davis
- Australian Institute of Bioengineering and Nanotechnology, School of Molecular and Microbial Sciences, University of Queensland, Brisbane QLD 4072, Australia, and Centre for Advanced Macromolecular Design, School of Chemical Sciences and Engineering, the University of New South Wales, Sydney, NSW 2052, Australia
| | - Christopher Barner-Kowollik
- Australian Institute of Bioengineering and Nanotechnology, School of Molecular and Microbial Sciences, University of Queensland, Brisbane QLD 4072, Australia, and Centre for Advanced Macromolecular Design, School of Chemical Sciences and Engineering, the University of New South Wales, Sydney, NSW 2052, Australia
| | - Michael J. Monteiro
- Australian Institute of Bioengineering and Nanotechnology, School of Molecular and Microbial Sciences, University of Queensland, Brisbane QLD 4072, Australia, and Centre for Advanced Macromolecular Design, School of Chemical Sciences and Engineering, the University of New South Wales, Sydney, NSW 2052, Australia
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40
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BU HAISHAN, GU FAMING, CHEN MIN, BAO LIRONG, CAO JIE. Crystallization and Melting Behavior of Nanopolymeric Particles Containing Single or a Few Chains. J MACROMOL SCI B 2006. [DOI: 10.1081/mb-100100374] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- HAISHAN BU
- a Department of Materials Science , Fudan University , Shanghai, 200433, The People's Republic of China
| | - FAMING GU
- a Department of Materials Science , Fudan University , Shanghai, 200433, The People's Republic of China
| | - MIN CHEN
- a Department of Materials Science , Fudan University , Shanghai, 200433, The People's Republic of China
| | - LIRONG BAO
- a Department of Materials Science , Fudan University , Shanghai, 200433, The People's Republic of China
| | - JIE CAO
- a Department of Materials Science , Fudan University , Shanghai, 200433, The People's Republic of China
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41
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Aharoni SA. Critical concentrations for intermolecular interpenetration and entanglements. J MACROMOL SCI B 2006. [DOI: 10.1080/00222347808212260] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Shaul A. Aharoni
- a Chemical Research Center Allied Chemical Company , Morristown, New Jersey, 07960
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42
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Irondi K, Zhang M, Duhamel J. Study of the Semidilute Solutions of Poly(N,N-dimethylacrylamide) by Fluorescence and Its Implications to the Kinetics of Coil-to-Globule Transitions. J Phys Chem B 2006; 110:2628-37. [PMID: 16471864 DOI: 10.1021/jp055596x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The large scale motions of poly(N,N-dimethylacrylamide) chains randomly labeled with pyrene (Py-PDMA) were monitored by steady-state and time-resolved fluorescence in semidilute solutions of naked PDMA in acetone and DMF for polymer concentrations ranging from 0 to 550 g/L. Although increasing the polymer concentration of the solution led to a decrease of the mobility of the chromophore attached onto the PDMA backbone, this reduction was rather modest when compared to the large increase of the macroscopic viscosity. This result indicated that locally, the monomer constituting the chains experienced freedom of movement despite the high solution viscosity. The restricted mobility of the chromophore was characterized by the number of monomers occupying the volume probed by the excited chromophore during its lifetime, referred to as a fluorescence "blob". The number of monomers constituting a fluorescence blob, N(F)(-)(blob), and the volume of a fluorescence blob, V(F)(-)(blob), were found to decrease as the polymer concentration of the solution increased, reflecting the decreased mobility experienced by the chromophore. In DMF, the radius of an F-blob was found to scale as N(nu)(F)(-)blob, where nu equaled 0.66 +/- 0.03, very close to the expected value of the Flory exponent of 0.6 for a polymer in a good solvent. The combined knowledge of how N(F)(-)(blob) varies with the fluorescence lifetime of the chromophore and the coil density of the polymer was used to propose a new means of studying coil-to-globule transitions with potential implications for predicting the rate of protein folding.
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Affiliation(s)
- Kamdi Irondi
- Institute for Polymer Research, Department of Chemistry, University of Waterloo, Waterloo, ON N2L 3G1, Canada
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43
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Thompson RL, McDonald MT, Lenthall JT, Hutchings LR. Solvent Accelerated Polymer Diffusion in Thin Films. Macromolecules 2005. [DOI: 10.1021/ma050317p] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Richard L. Thompson
- Department of Chemistry, University of Durham, South Road, Durham DH1 3LE, United Kingdom
| | - Martin T. McDonald
- Department of Chemistry, University of Durham, South Road, Durham DH1 3LE, United Kingdom
| | - Joseph T. Lenthall
- Department of Chemistry, University of Durham, South Road, Durham DH1 3LE, United Kingdom
| | - Lian R. Hutchings
- Department of Chemistry, University of Durham, South Road, Durham DH1 3LE, United Kingdom
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Nies E, Ramzi A, Berghmans H, Li T, Heenan RK, King SM. Composition Fluctuations, Phase Behavior, and Complex Formation in Poly(vinyl methyl ether)/D2O Investigated by Small-Angle Neutron Scattering. Macromolecules 2005. [DOI: 10.1021/ma0485641] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Erik Nies
- Laboratory of Polymer Technology, Eindhoven University of Technology, P.O.Box 513, 5600MB Eindhoven, The Netherlands, Polymer Research Division, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium, State Key Laboratory of Polymer Physics & Chemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100080, Peoples' Republic of China, and ISIS Facility, Rutherford Appleton Laboratory, Chilton,
| | - Aissa Ramzi
- Laboratory of Polymer Technology, Eindhoven University of Technology, P.O.Box 513, 5600MB Eindhoven, The Netherlands, Polymer Research Division, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium, State Key Laboratory of Polymer Physics & Chemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100080, Peoples' Republic of China, and ISIS Facility, Rutherford Appleton Laboratory, Chilton,
| | - Hugo Berghmans
- Laboratory of Polymer Technology, Eindhoven University of Technology, P.O.Box 513, 5600MB Eindhoven, The Netherlands, Polymer Research Division, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium, State Key Laboratory of Polymer Physics & Chemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100080, Peoples' Republic of China, and ISIS Facility, Rutherford Appleton Laboratory, Chilton,
| | - Ting Li
- Laboratory of Polymer Technology, Eindhoven University of Technology, P.O.Box 513, 5600MB Eindhoven, The Netherlands, Polymer Research Division, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium, State Key Laboratory of Polymer Physics & Chemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100080, Peoples' Republic of China, and ISIS Facility, Rutherford Appleton Laboratory, Chilton,
| | - Richard K. Heenan
- Laboratory of Polymer Technology, Eindhoven University of Technology, P.O.Box 513, 5600MB Eindhoven, The Netherlands, Polymer Research Division, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium, State Key Laboratory of Polymer Physics & Chemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100080, Peoples' Republic of China, and ISIS Facility, Rutherford Appleton Laboratory, Chilton,
| | - Stephen M. King
- Laboratory of Polymer Technology, Eindhoven University of Technology, P.O.Box 513, 5600MB Eindhoven, The Netherlands, Polymer Research Division, Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium, State Key Laboratory of Polymer Physics & Chemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100080, Peoples' Republic of China, and ISIS Facility, Rutherford Appleton Laboratory, Chilton,
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André P, Folk SL, Adam M, Rubinstein M, DeSimone JM. Light Scattering Study of Polydimethyl Siloxane in Liquid and Supercritical Carbon Dioxide. J Phys Chem A 2004. [DOI: 10.1021/jp0481308] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pascal André
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, and Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905
| | - Sarah L. Folk
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, and Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905
| | - Mireille Adam
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, and Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905
| | - Michael Rubinstein
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, and Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905
| | - Joseph M. DeSimone
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, and Department of Chemical Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905
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46
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Richter S. Mechanical properties of poly(vinyl methyl ether) hydrogels below and above their volume phase transition. Colloid Polym Sci 2004. [DOI: 10.1007/s00396-004-1178-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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47
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Inoue T, Yamashita Y, Watanabe H, Endoh MK, Hashimoto T. Stress Overshoot of Entangled Polymers in ϑ Solvent. Macromolecules 2004. [DOI: 10.1021/ma049833q] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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48
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Chari K, Kowalczyk J, Lal J. Conformation of Poly(ethylene oxide) in Polymer−Surfactant Aggregates. J Phys Chem B 2004. [DOI: 10.1021/jp036709k] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Krishnan Chari
- Research & Development Laboratories, Eastman Kodak Company, Rochester, New York 14650-2109, and IPNS Division, Argonne National Laboratory, Argonne, Illinois 60439-4814
| | - John Kowalczyk
- Research & Development Laboratories, Eastman Kodak Company, Rochester, New York 14650-2109, and IPNS Division, Argonne National Laboratory, Argonne, Illinois 60439-4814
| | - Jyotsana Lal
- Research & Development Laboratories, Eastman Kodak Company, Rochester, New York 14650-2109, and IPNS Division, Argonne National Laboratory, Argonne, Illinois 60439-4814
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49
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Benoît H, Koberstein J, Leibler L. Small angle neutron scattering from mixture of labelled and unlabelled chains and from partially labelled chains. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/macp.1981.020041981107] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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50
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Huang JR, Witten TA. Universal Ratios of Characteristic Lengths in Semidilute Polymer Solutions. Macromolecules 2002. [DOI: 10.1021/ma020792c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jung-Ren Huang
- James Franck Institute and Department of Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637
| | - Thomas A. Witten
- James Franck Institute and Department of Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, Illinois 60637
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