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Direct Observation of Poly(propylene)-block-Poly(ethylene-co-propylene) Molecules by Atomic Force Microscopyстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Scopus,
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 29 января 2018 г.
- Авторы: Prokhorov Valery V., Nitta Koh-hei, Terano Minoru
- Журнал: Macromolecular Chemistry and Physics
- Том: 205
- Номер: 2
- Год издания: 2004
- Издательство: John Wiley & Sons Ltd.
- Местоположение издательства: United Kingdom
- Первая страница: 179
- Последняя страница: 186
- DOI: 10.1002/macp.200350086
- Аннотация: Atomic force microscopy (AFM) has been applied to get molecular images of diblock poly(propylene)-block-poly(ethylene-co-propylene) copolymers deposited on mica from diluted solutions at elevated temperatures. Both isolated molecules and their small aggregates have been visualized as compact particles of various sizes with outspreading poly(ethylene-co-propylene) chains. On the base of the height, volume and morphological analysis AFM images were divided into three groups. In the first group the compact particles are suggested to be small regular-shaped crystallites formed by a few poly(propylene) blocks. Some isolated particles of this group were connected with single copolymer chains. In the second group the compact particles have larger dimensions and irregular or round shapes implying unordered packing of constituents. The third group were represented by isolated poly(ethylene-co-propylene) coils. The two-dimensional expansion of coils on mica both isolated and included in aggregates exceeds several times their dimensions in a solution. The probable mechanism of such an expansion is proposed relying on the existence of van-der-Waals surface force field of a sufficient strength in the vicinity of the crystal surface.
- Добавил в систему: Прохоров Валерий Васильевич