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Dilute solution properties of poly(benzyl methacrylate) in ionic liquids
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SYSNO ASEP 0522173 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Dilute solution properties of poly(benzyl methacrylate) in ionic liquids Author(s) Kharel, A. (US)
Hall, C. (US)
Černoch, Peter (UMCH-V) RID, ORCID
Štěpánek, Petr (UMCH-V) RID, ORCID
Lodge, T. P. (US)Source Title Macromolecules. - : American Chemical Society - ISSN 0024-9297
Roč. 53, č. 3 (2020), s. 885-894Number of pages 10 s. Language eng - English Country US - United States Keywords ionic liquids ; light scattering ; poly(benzyl methacrylate) Subject RIV CD - Macromolecular Chemistry OECD category Polymer science R&D Projects GA19-10429S GA ČR - Czech Science Foundation (CSF) LO1507 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UMCH-V - RVO:61389013 UT WOS 000513299100013 EID SCOPUS 85079074696 DOI 10.1021/acs.macromol.9b02618 Annotation The static and dynamic properties of a range of molecular weights (2 × 104 to 1.6 × 105 g/mol) of poly(benzyl methacrylate) have been assessed in four different imidazolium- and pyrrolidinium-based ionic liquids over a wide temperature range (27–155 °C), primarily using light scattering techniques. All four systems exhibit lower critical solution temperature phase behavior. The relevant structural, dynamic, and thermodynamic parameters were examined as a function of concentration, temperature, and molecular weight. Some interesting observations were revealed. The phase boundaries suggest a shift of the critical composition toward the polymer-rich region, in contrast to the low critical concentrations for polymers commonly observed in polymer solutions. Surprisingly, the second virial coefficient (A2) remains positive, even at temperatures close to phase separation, where A2 < 0 is anticipated. Furthermore, A2 also shows stronger dependence on molecular weight than commonly observed for polymers in good solvents. On the dynamic side, the diffusion virial coefficients (kd) remained positive over the given temperature range, further corroborating the apparent good solvent behavior of A2. The excluded volume exponents (ν ≈ 0.53–0.54) obtained from the dependence of hydrodynamic radii on molecular weight also indicate good solvent characteristics. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2021 Electronic address https://pubs.acs.org/doi/10.1021/acs.macromol.9b02618
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