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Thermoresponsive segments retard the formation of equilibrium micellar interpolyelectrolyte complexes by detouring to various intermediate structuresстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 21 августа 2017 г.
- Авторы: Dähling C., Lotze G., Mori H., Pergushov D.V., Plamper F.A.
- Журнал: Journal of Physical Chemistry B
- Том: 121
- Номер: 27
- Год издания: 2017
- Издательство: American Chemical Society
- Местоположение издательства: United States
- Первая страница: 6739
- Последняя страница: 6748
- DOI: 10.1021/acs.jpcb.7b04238
- Аннотация: The kinetics of interpolyelectrolyte complexation involving architecturally complex (star-like) polymeric components is addressed. Specifically, the spontaneous coupling of branched cationic star-shaped miktoarm polymers, i.e., quaternized poly(ethylene oxide)114-(poly(2-(dimethylamino)ethyl methacrylate)17)4 (PEO114-(qPDMAEMA17)4), and temperature-sensitive linear anionic diblock copolymers poly(vinyl sulfonate)31-b-poly(N-isopropylacrylamide)27 (PVS31-b-PNIPAM27) and further rearrangements of the formed complexes were investigated by means of stopped-flow small-angle X-ray scattering (SAXS). Colloidally stable micelles were obtained upon mixing both polymers at a 1:1 charge molar ratio in saline solutions. The description of the time-resolved SAXS data with appropriate form factor models yielded dimensions for each micellar domain and detailed the picture of the time-dependent size changes and restructuring processes. A fast interpolyelectrolyte coupling and structural equilibration were observed when mixing occurs below the lower critical solution temperature (LCST) of PNIPAM, resulting in small spherical-like assemblies with hydrated PNIPAM coronal blocks. Above the LCST, the collapsed PNIPAM decelerates equilibration, though temperature as such is expected to boost the kinetics of complex formation: after a fast initial interpolyelectrolyte coupling, different nonequilibrium structures of spherical and worm-like shape are observed on different time scales. This study illustrates how a thermoresponsive component can modulate the influence of temperature on kinetics, particularly for rearrangement processes toward equilibrium structures during interpolyelectrolyte complexation.
- Добавил в систему: Пергушов Дмитрий Владимирович