NMR study of thermoresponsive block copolymer in aqueous solution

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F16%3A00460278" target="_blank" >RIV/61389013:_____/16:00460278 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1002/macp.201600025" target="_blank" >http://dx.doi.org/10.1002/macp.201600025</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/macp.201600025" target="_blank" >10.1002/macp.201600025</a>

Jazyk výsledku

angličtina

Název v původním jazyce

NMR study of thermoresponsive block copolymer in aqueous solution

Popis výsledku v původním jazyce

Temperature behavior of D2O solutions of poly(ethylene oxide) (PEO)114-block-poly(N-isopropylacrylamide) (PNIPAm)109 is characterized by NMR methods. At temperatures above the lower critical solution temperature (LCST) transition of PNIPAm component, 1H NMR spectra are consistent with existence of micelles where immobilized PNIPAm blocks form rather compact core and mobile PEO blocks form a shell of micelles. The transition of PNIPAm component shifts toward lower temperatures with increasing polymer concentration. 2D nuclear Overhauser effect spectroscopy spectra which can provide information on proton groups in close spatial contact (<0.5 nm) show an increase in intensity of cross-peaks between PEO protons and main chain CH and CH2 protons, and isopropyl CH protons of PNIPAm units after increasing the temperature from 292.7 to 301.6 K. The fact that this change occurs at temperature, which is still below the LCST transition of PNIPAm component evidences certain conformation changes in the PEO-b-PNIPAm block copolymer already in the pretransition region.

Název v anglickém jazyce

NMR study of thermoresponsive block copolymer in aqueous solution

Popis výsledku anglicky

Temperature behavior of D2O solutions of poly(ethylene oxide) (PEO)114-block-poly(N-isopropylacrylamide) (PNIPAm)109 is characterized by NMR methods. At temperatures above the lower critical solution temperature (LCST) transition of PNIPAm component, 1H NMR spectra are consistent with existence of micelles where immobilized PNIPAm blocks form rather compact core and mobile PEO blocks form a shell of micelles. The transition of PNIPAm component shifts toward lower temperatures with increasing polymer concentration. 2D nuclear Overhauser effect spectroscopy spectra which can provide information on proton groups in close spatial contact (<0.5 nm) show an increase in intensity of cross-peaks between PEO protons and main chain CH and CH2 protons, and isopropyl CH protons of PNIPAm units after increasing the temperature from 292.7 to 301.6 K. The fact that this change occurs at temperature, which is still below the LCST transition of PNIPAm component evidences certain conformation changes in 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

—

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 Chemistry and Physics

ISSN

1022-1352

e-ISSN

—

Svazek periodika

217

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

6

Strana od-do

1370-1375

Kód UT WoS článku

000380018700006

EID výsledku v databázi Scopus

2-s2.0-84977962658