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Dilute solution properties of poly(benzyl methacrylate) in ionic liquids
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SYSNO ASEP 0522173 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Dilute solution properties of poly(benzyl methacrylate) in ionic liquids Tvůrce(i) Kharel, A. (US)
Hall, C. (US)
Černoch, Peter (UMCH-V) RID, ORCID
Štěpánek, Petr (UMCH-V) RID, ORCID
Lodge, T. P. (US)Zdroj.dok. Macromolecules. - : American Chemical Society - ISSN 0024-9297
Roč. 53, č. 3 (2020), s. 885-894Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova ionic liquids ; light scattering ; poly(benzyl methacrylate) Vědní obor RIV CD - Makromolekulární chemie Obor OECD Polymer science CEP GA19-10429S GA ČR - Grantová agentura ČR LO1507 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Omezený přístup Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000513299100013 EID SCOPUS 85079074696 DOI 10.1021/acs.macromol.9b02618 Anotace 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. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2021 Elektronická adresa https://pubs.acs.org/doi/10.1021/acs.macromol.9b02618
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