Temperature-induced phase transition in aqueous solutions of poly(N-isopropylacrylamide)-based block copolymer

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F16%3A00465712" target="_blank" >RIV/61389013:_____/16:00465712 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1002/masy.201600058" target="_blank" >http://dx.doi.org/10.1002/masy.201600058</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/masy.201600058" target="_blank" >10.1002/masy.201600058</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Temperature-induced phase transition in aqueous solutions of poly(N-isopropylacrylamide)-based block copolymer

Popis výsledku v původním jazyce

Temperature-induced phase transition in D2O solutions of the poly(ethylene oxide)(PEO)-b-poly(N-isopropylacrylamide)(PNIPAm) block copolymer was investigated and compared with the LCST transition of the PNIPAm homopolymer. We confirmed that the temperature behavior of solutions of the PEO-b-PNIPAm in NMR spectra is in accord with existence of micelles where immobilized PNIPAm blocks form rather compact core and mobile PEO blocks form a shell of micelles. By combination of NMR and IR spectroscopy, and DSC we have found that the phase transition and globular structures of the PNIPAm component are significantly affected by the presence of the PEO block. E.g., at temperatures above the phase transition the degree of dehydration of PNIPAm segments (C[DOUBLE BOND]O groups) is two times larger in the block copolymer in comparison with the neat PNIPAm. 2D NOESY spectra revealed certain conformation changes in the solution of the PEO-b-PNIPAm block copolymer already in the pretransition region.

Název v anglickém jazyce

Temperature-induced phase transition in aqueous solutions of poly(N-isopropylacrylamide)-based block copolymer

Popis výsledku anglicky

Temperature-induced phase transition in D2O solutions of the poly(ethylene oxide)(PEO)-b-poly(N-isopropylacrylamide)(PNIPAm) block copolymer was investigated and compared with the LCST transition of the PNIPAm homopolymer. We confirmed that the temperature behavior of solutions of the PEO-b-PNIPAm in NMR spectra is in accord with existence of micelles where immobilized PNIPAm blocks form rather compact core and mobile PEO blocks form a shell of micelles. By combination of NMR and IR spectroscopy, and DSC we have found that the phase transition and globular structures of the PNIPAm component are significantly affected by the presence of the PEO block. E.g., at temperatures above the phase transition the degree of dehydration of PNIPAm segments (C[DOUBLE BOND]O groups) is two times larger in the block copolymer in comparison with the neat PNIPAm. 2D NOESY spectra revealed certain conformation changes in the solution of the PEO-b-PNIPAm block copolymer already in the pretransition region.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CD - Makromolekulární chemie

OECD FORD obor

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Projekt

<a href="/cs/project/GA15-13853S" target="_blank" >GA15-13853S: Struktury a interakce ve vodných roztocích termoresponsivních polymerů nového typu</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Macromolecular Symposia

ISSN

1022-1360

e-ISSN

—

Svazek periodika

369

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

5

Strana od-do

92-96

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-84995932422