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Temperature behavior of aqueous solutions of poly(2-oxazoline) homopolymer and block copolymers investigated by NMR spectroscopy and dynamic light scattering
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SYSNO ASEP 0531870 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Temperature behavior of aqueous solutions of poly(2-oxazoline) homopolymer and block copolymers investigated by NMR spectroscopy and dynamic light scattering Tvůrce(i) Konefal, Rafal (UMCH-V) RID, ORCID
Černoch, Peter (UMCH-V) RID, ORCID
Konefal, Magdalena (UMCH-V) ORCID, RID
Spěváček, Jiří (UMCH-V) RID, ORCIDČíslo článku 1879 Zdroj.dok. Polymers. - : MDPI
Roč. 12, č. 9 (2020), s. 1-16Poč.str. 16 s. Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova thermoresponsive polymer ; poly(2-ethyl-2-oxazoline) ; poly(2-isopropyl-2-oxazoline) Vědní obor RIV CD - Makromolekulární chemie Obor OECD Polymer science CEP GA15-13853S GA ČR - Grantová agentura ČR GA18-12925S GA ČR - Grantová agentura ČR Způsob publikování Open access Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000581299500001 EID SCOPUS 85090567195 DOI 10.3390/polym12091879 Anotace 1H NMR methods in combination with dynamic light scattering were applied to study temperature behavior of poly(2-isopropyl-2-oxazoline) (PIPOx) homopolymer as well as PIPOx-b-poly(2-methyl-2-oxazoline) (PMeOx) and poly(2-ethyl-2-oxazoline) (PEtOx)-b-PMeOx diblock copolymers in aqueous solutions. 1H NMR spectra showed a different way of phase transition for the main and side chains in PIPOx-based solutions. Additionally, the phase transition is irreversible for PIPOx homopolymer and partially reversible for PIPOx-b-PMeOx copolymer. As revealed by NMR, the phase transition in PEtOx-based copolymers solutions exists despite the absence of solution turbidity. It is very broad, virtually independent of the copolymer composition and reversible with some hysteresis. Two types of water molecules were detected in solutions of the diblock copolymers above the phase transition—“free” with long and “bound” with short spin–spin relaxation times T2. NOESY spectra revealed information about conformational changes observed already in the pre-transition region of PIPOx-b-PMeOx copolymer solution. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2021 Elektronická adresa https://www.mdpi.com/2073-4360/12/9/1879
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