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NMR investigations of temperature-induced phase transition in aqueous polymer solutions
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SYSNO ASEP 0363237 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title NMR investigations of temperature-induced phase transition in aqueous polymer solutions Author(s) Spěváček, Jiří (UMCH-V) RID, ORCID Source Title Macromolecular Symposia. - : Wiley - ISSN 1022-1360
Roč. 305, č. 1 (2011), s. 18-25Number of pages 8 s. Language eng - English Country DE - Germany Keywords aqueous polymer solutions ; cooperative effects ; NMR Subject RIV CD - Macromolecular Chemistry R&D Projects GA202/09/1281 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z40500505 - UMCH-V (2005-2011) UT WOS 000298812600003 DOI 10.1002/masy.201000107 Annotation The different dynamics of polymer segments forming phase-separated globular structures in aqueous (D2O) solutions affects both the shape of NMR spectra and NMR relaxation times of polymer and solvent. Two types of the approach are discussed. The first one is based on the reduction of integrated intensities of polymer NMR lines in high-resolution NMR spectra in the system undergoing the coil-globule phase transition. The fraction p of phase-separated units (units with significantly reduced mobility) and subsequently, e.g., thermodynamic parameters DH and DS characterizing the coil-globule phase transition can be determined. The second approach is based on measurements of 1H NMR relaxation times of water (HDO) which provide information on behaviour of water during phase transition. The power of both approaches is demonstrated on results obtained with solutions of several thermoresponsive homopolymers and copolymers. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2012
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