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Thermoresponsive behaviour of terpolymers containing poly(ethylene oxide), poly(2-ethyl-2-oxazoline) and poly(.epsilon.-caprolactone) blocks in aqueous solutions: an NMR study
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SYSNO ASEP 0464015 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Thermoresponsive behaviour of terpolymers containing poly(ethylene oxide), poly(2-ethyl-2-oxazoline) and poly(.epsilon.-caprolactone) blocks in aqueous solutions: an NMR study Author(s) Konefal, Rafal (UMCH-V) RID, ORCID
Spěváček, Jiří (UMCH-V) RID, ORCID
Jäger, Eliezer (UMCH-V) ORCID, RID
Petrova, Svetlana (UMCH-V) RID, ORCIDSource Title Colloid and Polymer Science - ISSN 0303-402X
Roč. 294, č. 11 (2016), s. 1717-1726Number of pages 10 s. Language eng - English Country DE - Germany Keywords thermoresponsive polymer ; terpolymer containing poly(ethylene oxide), poly(2-ethyl-2-oxazoline) and poly(epsilon-caprolactone) blocks ; nanoparticles Subject RIV CD - Macromolecular Chemistry R&D Projects GA15-13853S GA ČR - Czech Science Foundation (CSF) 7F14009 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UMCH-V - RVO:61389013 UT WOS 000386339600003 EID SCOPUS 84982095359 DOI 10.1007/s00396-016-3930-7 Annotation 1H NMR spectroscopy was used for the first time to investigate temperature behaviour of aqueous solutions of nanoparticles (NPs) prepared from linear and Y-shape terpolymers containing blocks of poly(ethylene oxide) (PEO), poly(2-ethyl-2-oxazoline) (PEtOx) and one linear or two star poly(epsilon-caprolactone) (PCL) blocks with different length. Structural changes were characterized separately for all blocks in a temperature range 295–360 K, and a broad transition was observed at temperatures above similar to 320 K. The temperature behaviour of NPs solutions depends on polymer concentration and especially on terpolymer architecture. At the same time, NMR measurements revealed important role of PCL blocks in this behaviour. The spin-spin relaxation times T2 of water (HDO) give information on the behaviour of water and on polymer-water interactions within the aforementioned temperature range. In NPs solutions of the linear copolymer, two types of water were detected at higher temperatures: “free” and “bound” water molecules with long and very short T2 values, respectively. For NPs solution of non-linear terpolymer, two types of water were observed only for the highest used (1.5 wt%) polymer concentration. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2017
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