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Kang JJ, Sachse C, Ko CH, Schroer MA, Vela SD, Molodenskiy D, Kohlbrecher J, Bushuev NV, Gumerov RA, Potemkin II, Jordan R, Papadakis CM. Rigid-to-Flexible Transition in a Molecular Brush in a Good Solvent at a Semidilute Concentration. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:5226-5236. [PMID: 35166545 DOI: 10.1021/acs.langmuir.1c02589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The structures of a molecular brush in a good solvent are investigated using synchrotron small-angle X-ray scattering in a wide range of concentrations. The brush under study, PiPOx239-g-PnPrOx14, features a relatively long poly(2-isopropenyl-2-oxazoline) (PiPOx) backbone and short poly(2-n-propyl-2-oxazoline) (PnPrOx) side chains. As a solvent, ethanol is used. By model fitting, the overall size and the persistence length as well as the interaction length and interaction strength are determined. At this, the interplay between form and structure factor is taken into account. The conformation of the molecular brush is traced upon increasing the solution concentration, and a rigid-to-flexible transition is found near the overlap concentration. Finally, the results of computer simulations of the molecular brush solutions confirm the experimental results.
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Affiliation(s)
- Jia-Jhen Kang
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Clemens Sachse
- Professur für Makromolekulare Chemie, Fakultät Chemie und Lebensmittelchemie, Technische Universität Dresden, Mommsenstraße 4, 01069 Dresden, Germany
| | - Chia-Hsin Ko
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
| | - Martin A Schroer
- European Molecular Biology Laboratory, Hamburg Outstation, c/o Deutsches Elektronen-Synchrotron, Notkestr. 85, 22607 Hamburg, Germany
| | - Stefano Da Vela
- European Molecular Biology Laboratory, Hamburg Outstation, c/o Deutsches Elektronen-Synchrotron, Notkestr. 85, 22607 Hamburg, Germany
| | - Dmitry Molodenskiy
- European Molecular Biology Laboratory, Hamburg Outstation, c/o Deutsches Elektronen-Synchrotron, Notkestr. 85, 22607 Hamburg, Germany
| | - Joachim Kohlbrecher
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Forschungsstr. 111, 5232 Villigen PSI, Switzerland
| | - Nikita V Bushuev
- Physics Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
- National Research South Ural State University, Chelyabinsk 454080, Russian Federation
| | - Rainer Jordan
- Professur für Makromolekulare Chemie, Fakultät Chemie und Lebensmittelchemie, Technische Universität Dresden, Mommsenstraße 4, 01069 Dresden, Germany
| | - Christine M Papadakis
- Fachgebiet Physik weicher Materie, Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
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Höhner JR, Gumerov RA, Potemkin II, Rodriguez-Emmenegger C, Kostina NY, Mourran A, Englert J, Schröter D, Janke L, Möller M. Globular Hydrophilic Poly(acrylate)s by an Arborescent Grafting-from Synthesis. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c02548] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Robin Höhner
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen 52074, Germany
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
| | - Rustam A. Gumerov
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
- Physics Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
| | - Igor I. Potemkin
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
- Physics Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation
- National Research South Ural State University, Chelyabinsk 454080, Russian Federation
| | | | - Nina Yu. Kostina
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
| | - Ahmed Mourran
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
| | - Jenny Englert
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen 52074, Germany
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
| | - David Schröter
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen 52074, Germany
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
| | - Lennart Janke
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen 52074, Germany
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
| | - Martin Möller
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen 52074, Germany
- DWI Leibniz Institute for Interactive Materials, Aachen 52056, Germany
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, Moscow 119991, Russia
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Rodichkin ID, Gumerov RA, Potemkin II. Self-assembly of miktoarm palm tree-like star copolymers in a selective solvent. J Colloid Interface Sci 2022; 606:1966-1973. [PMID: 34749445 DOI: 10.1016/j.jcis.2021.09.196] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 06/29/2021] [Accepted: 09/30/2021] [Indexed: 11/25/2022]
Abstract
Amphiphilic miktoarm star copolymers with one long solvophobic arm (a "stem") and several short solvophilic arms (the "leaves") were studied in a selective solvent using mesoscopic computer simulations. The conventional morphologies (spherical, cylindrical and vesicular) as well as the mixed ones were obtained. However, the resulting diagram of states appeared to be different from the diagram of the linear diblock copolymer with the analogous composition. Namely, the increase of the number of leaves at fixed solvophobic-solvophilic ratio leads to the transition from the vesicles to the cylinders, while the latter ones eventually transform into spherical micelles in the case of highly branched copolymers. The observed effect appears due to the increase of the interfacial area between the collapsed and swollen blocks per single macromolecule. In turn, the increase of the solvent selectivity shifts the stability region of the cylindrical micelles to the region of more symmetric copolymer composition. Meanwhile, the compatibility between the blocks has a weak effect on the resulting morphology. Finally, it was found that the increase in the number of leaves and the simultaneous decrease in their length results in the localization of higher amount of solvophilic segments near the core-solvent interface, which in the case of cylindrical micelles significantly affects the shape of the aggregates making them thinner and longer.
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Affiliation(s)
- Ivan D Rodichkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation
| | - Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation; DWI - Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52056, Germany
| | - Igor I Potemkin
- Physics Department, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russian Federation; DWI - Leibniz Institute for Interactive Materials e.V., Forckenbeckstraße 50, Aachen 52056, Germany; National Research South Ural State University, Chelyabinsk 454080, Russian Federation.
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Kravchenko VS, Abetz V, Potemkin II. Self-assembly of gradient copolymers in a selective solvent. New structures and comparison with diblock and statistical copolymers. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.124288] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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