Počet záznamů: 1
Thermoresponsive behavior of block copolymers of PEO and PNIPAm with different architecture in aqueous solutions: a study by NMR, FTIR, DSC and quantum-chemical calculations
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SYSNO ASEP 0476789 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Thermoresponsive behavior of block copolymers of PEO and PNIPAm with different architecture in aqueous solutions: a study by NMR, FTIR, DSC and quantum-chemical calculations Tvůrce(i) Spěváček, Jiří (UMCH-V) RID, ORCID
Konefal, Rafal (UMCH-V) RID, ORCID
Dybal, Jiří (UMCH-V) RID, ORCID
Čadová, Eva (UMCH-V) RID
Kovářová, Jana (UMCH-V) RIDZdroj.dok. European Polymer Journal. - : Elsevier - ISSN 0014-3057
Roč. 94, September (2017), s. 471-483Poč.str. 13 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova thermoresponsive polymer ; diblock copolymer PEO-b-PNIPAm ; y-shape triblock copolymer PEO-b-(PNIPAm)2 Vědní obor RIV CD - Makromolekulární chemie Obor OECD Polymer science CEP GA15-13853S GA ČR - Grantová agentura ČR Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000411546400041 EID SCOPUS 85026633235 DOI 10.1016/j.eurpolymj.2017.07.034 Anotace Temperature behavior of D2O solutions of thermoresponsive diblock poly(ethylene oxide) (PEO)-b-poly(N-isopropylacrylamide) (PNIPAm) copolymers and Y-shape triblock PEO-b-(PNIPAm)2 copolymers was investigated and compared with the phase transition of the PNIPAm homopolymer by combination of NMR and ATR FTIR spectroscopy, DSC and model quantum-chemical calculations. It is shown that the phase transition and structures of PNIPAm component (forming micellar cores) are significantly affected not only by the presence of the PEO block but also by copolymer architecture. Both these factors affect energetics of the phase transition, influence of the polymer concentration and behavior of bound water at elevated temperatures. They also affect the degree of dehydration of PNIPAm segments (CO groups) at temperatures above the phase transition which is higher for block copolymers (especially for the diblock) in comparison with PNIPAm homopolymer. NOESY NMR spectra likewise revealed influence of the architecture of the block copolymer on its conformational behavior in the pretransition region. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2018
Počet záznamů: 1