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Switching Chirality of Hybrid Left–Right Crystalline Helicoids Built of Achiral Polymer Chains: When Right to Left Becomes Left to Rightстатья
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: 20 января 2015 г.
- Авторы: Martin Rosenthal, Manfred Burghammer, Georg Bar, Samulski Edward T., Ivanov Dimitri A.
- Журнал: Macromolecules
- Том: 47
- Номер: 23
- Год издания: 2014
- Издательство: American Chemical Society
- Местоположение издательства: United States
- Первая страница: 8295
- Последняя страница: 8304
- DOI: 10.1021/ma501733n
- Аннотация: It is widely accepted that achiral polymers crystallize in lamella helicoids of both handedness, whereas chiral polymers are known to form helicoids of only one handedness. By employing nanofocus X-ray diffraction, we show that the situation is more complex and that the lamella helicoids of achiral polymers can be in fact hybrid, i.e., containing a left- and a right-handed part. Moreover, our data demonstrate that the poly(trimethylene terephthalate) lamellae invert chirality at a certain crystallization temperature. The chirality correlates with the growth axis polarity (i.e., a versus −a) and handedness of the lamellar helicoid (L versus R) and can be conveniently expressed in terms of the chirality parameter pairs. In addition, the overall chain tilt does not affect the rate and sense of twisting, calling into question the premise of the Keith and Padden model. Instead, the inclination of the terminal segment of the crystalline stem protruding the lamellar surface is proposed to be the key factor controlling the surface stresses.
- Добавил в систему: Иванов Дмитрий Анатольевич