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Block and Gradient Copoly(2-oxazoline) Micelles: Strikingly different on the Insideстатья
Статья опубликована в высокорейтинговом журнале
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: 28 сентября 2017 г.
- Авторы: Filippov S.K., Verbraeken B., Konarev P.V., Svergun D.I., Angelov B., Vishnevetskaya N.S., Papadakis C.M., Rogers S., Radulescu A., Courtin T., Martins J.C., Starovoitova L., Hruby M., Stepanek P., Kravchenko V.S., Potemkin I.I., Hoogenboom R.
- Журнал: Journal of Physical Chemistry Letters
- Том: 8
- Год издания: 2017
- Издательство: American Chemical Society
- Местоположение издательства: United States
- Первая страница: 3800
- Последняя страница: 3804
- DOI: 10.1021/acs.jpclett.7b01588
- Аннотация: Herein, we provide a direct proof for differences in the micellar structure of amphiphilic diblock and gradient copolymers, thereby unambiguously demonstrating the influence of monomer distribution along the polymer chains on the micellization behavior. The internal structure of amphiphilic block and gradient co poly(2-oxazolines) based on the hydrophilic poly(2-methyl-2-oxazoline) (PMeOx) and the hydrophobic poly(2-phenyl-2-oxazoline) (PPhOx) was studied in water and water−ethanol mixtures by small-angle X-ray scattering (SAXS), smallangle neutron scattering (SANS), static and dynamic light scattering (SLS/DLS), and 1H NMR spectroscopy. Contrast matching SANS experiments revealed that block copolymers form micelles with a uniform density profile of the core. In contrast to popular assumption, the outer part of the core of the gradient copolymer micelles has a distinctly higher density than the middle of the core. We attribute the latter finding to back-folding of chains resulting from hydrophilic−hydrophobic interactions, leading to a new type of micelles that we refer to as micelles with a “bitterball-core” structure.
- Добавил в систему: Потемкин Игорь Иванович