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Almásy L, Artykulnyi OP, Petrenko VI, Ivankov OI, Bulavin LA, Yan M, Haramus VM. Structure and Intermolecular Interactions in Aqueous Solutions of Polyethylene Glycol. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27082573. [PMID: 35458769 PMCID: PMC9024505 DOI: 10.3390/molecules27082573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 04/07/2022] [Accepted: 04/11/2022] [Indexed: 11/16/2022]
Abstract
Aqueous solutions of polyethylene glycol are studied by small-angle neutron scattering over a broad range of polymer molecular masses and concentrations. The scattering data were modeled by a Gaussian chain form factor combined with random phase approximation, which provided good fits over the whole studied concentration range. The results showed that polyethylene glycol in the molecular mass range 0.4–20 kDa in water at physiological temperature T = 37 °C behaves like a random coil in nearly theta solvent conditions. The obtained results serve as a reference for the description of complex mixtures with PEG used in various applications.
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Affiliation(s)
- László Almásy
- State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China;
- Institute for Energy Security and Environmental Safety, Centre for Energy Research, Konkoly-Thege Miklós út 29-33, 1121 Budapest, Hungary
- Correspondence: (L.A.); (V.M.H.)
| | - Oleksandr P. Artykulnyi
- Faculty of Physics, Taras Shevchenko Kyiv National University, 01601 Kyiv, Ukraine; (O.P.A.); (O.I.I.); (L.A.B.)
| | - Viktor I. Petrenko
- BCMaterials, Basque Centre for Materials, Applications and Nanostructures, 48940 Leioa, Spain;
- IKERBASQUE, Basque Foundation for Science, 48009 Bilbao, Spain
| | - Oleksandr I. Ivankov
- Faculty of Physics, Taras Shevchenko Kyiv National University, 01601 Kyiv, Ukraine; (O.P.A.); (O.I.I.); (L.A.B.)
| | - Leonid A. Bulavin
- Faculty of Physics, Taras Shevchenko Kyiv National University, 01601 Kyiv, Ukraine; (O.P.A.); (O.I.I.); (L.A.B.)
| | - Minhao Yan
- State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China;
| | - Vasil M. Haramus
- Helmholtz-Zentrum Hereon, Max-Planck-Street 1, 21502 Geesthacht, Germany
- Correspondence: (L.A.); (V.M.H.)
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Wong LN, Jones SD, Wood K, de Campo L, Darwish T, Moir M, Li H, Segalman RA, Warr GG, Atkin R. Polycation radius of gyration in a polymeric ionic liquid (PIL): the PIL melt is not a theta solvent. Phys Chem Chem Phys 2022; 24:4526-4532. [PMID: 35119064 DOI: 10.1039/d1cp05354j] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The conformation of the polycation in the prototypical polymeric ionic liquid (PIL) poly(3-methyl-1-aminopropylimidazolylacrylamide) bis(trifluoromethylsulfonyl)imide (poly(3MAPIm)TFSI) was probed using small-angle neutron scattering (SANS) and ultra-small-angle neutron scattering (USANS) at 25 °C and 80 °C. Poly(3MAPIm)TFSI contains microvoids which lead to intense low q scattering that can be mitigated using mixtures of hydrogen- and deuterium-rich materials, allowing determination of the polycation conformation and radius of gyration (Rg). In the pure PIL, the polycation adopts a random coil conformation with Rg = 52 ± 0.5 Å. In contrast to conventional polymer melts, the pure PIL is not a theta solvent for the polycation. The TFSI- anions, which comprise 48% v/v of the PIL, are strongly attracted to the polycation and act like small solvent molecules which leads to chain swelling analogous to an entangled, semi-dilute, or concentrated polymer solution in a good solvent.
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Affiliation(s)
- Lucas N Wong
- School of Molecular Sciences, The University of Western Australia, Crawley, Perth 6009, Australia.
| | - Seamus D Jones
- Chemical Engineering Department and Materials Department, University of California, Santa Barbara, California 93106, USA
| | - Kathleen Wood
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, NSW 2234, Australia
| | - Liliana de Campo
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, NSW 2234, Australia
| | - Tamim Darwish
- National Deuteration Facility (NDF), ANSTO, Lucas Heights, NSW 2234, Australia
| | - Michael Moir
- National Deuteration Facility (NDF), ANSTO, Lucas Heights, NSW 2234, Australia
| | - Hua Li
- School of Molecular Sciences, The University of Western Australia, Crawley, Perth 6009, Australia.
| | - Rachel A Segalman
- Chemical Engineering Department and Materials Department, University of California, Santa Barbara, California 93106, USA
| | - Gregory G Warr
- School of Chemistry and University of Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Rob Atkin
- School of Molecular Sciences, The University of Western Australia, Crawley, Perth 6009, Australia.
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