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Vapor-induced spreading dynamics of adsorbed linear and brush-like macromolecules as observed by environmental SFM: Polymer chain statistics and scaling exponentsстатья
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: 18 июля 2013 г.
- Авторы: Gallyamov Marat O., Tartsch Bernd, Mela Petra, Potemkin Igor I., Sheiko Sergei S., Boerner Hans, Matyjaszewski Krzysztof, Khokhlov Alexei R., Moeller Martin
- Журнал: Journal of Polymer Science, Part B: Polymer Physics
- Том: 45
- Номер: 17
- Год издания: 2007
- Издательство: John Wiley & Sons Inc.
- Местоположение издательства: United States
- Первая страница: 2368
- Последняя страница: 2379
- DOI: 10.1002/polb.21253
- Аннотация: Scaling exponents v, that describe the correlation between mean square end-to-end distances and contour lengths of macromolecules, were determined by statistical analysis of scanning force micrographs of single linear poly(2-vinylpyridine) and brush-like poly(butanoate-ethyl methacrylate)-graft-poly(n-butyl acrylate) macromolecules adsorbed on mica. Using an atmosphere-controlled scanning force microscope, single adsorbed molecules were collapsed and re-expanded upon being exposed to alcohol and water vapor, respectively. This manipulated collapse-unfolding was used to equilibrate the molecular structure/conformation. The in situ and real-time scanning force microscopy analysis allows the scientist to quantitatively characterize end-to-end distances and contour lengths of the molecules directly on the image and to observe differences in the spreading dynamics for the two types of macromolecules. A distinct difference has been observed between the expanded two-dimensional (2D) conformations of linear and brush-like polymer chains. Whereas a scaling exponent v of 0.73 was found for the expanded 2D conformation of the linear molecules, a v-value of 0.53 was determined for the expanded 2D conformation of the seemingly stiffer brush-like molecules. A theoretical explanation of the differences between the 2D conformations of brush-like and linear macromolecules is proposed here. (c) 2007 Wiley Periodicals, Inc.
- Добавил в систему: Галлямов Марат Олегович