Пожалуйста, используйте этот идентификатор, чтобы цитировать или ссылаться на этот ресурс:
http://elar.urfu.ru/handle/10995/111373
Название: | PEO/CHCl3. Crystallinity of the Polymer and Vapor Pressure of the Solvent. Equilibrium and Nonequilibrium Phenomena |
Авторы: | Khasanova, A. Kh. Wolf, B. A. |
Дата публикации: | 2003 |
Издатель: | American Chemical Society (ACS) |
Библиографическое описание: | Khasanova A. Kh. PEO/CHCl3. Crystallinity of the Polymer and Vapor Pressure of the Solvent. Equilibrium and Nonequilibrium Phenomena / A. Kh. Khasanova, B. A. Wolf. — DOI 10.2495/SC210181 // Macromolecules. — 2003. — Vol. 36. — Iss. 17. — P. 6645-6652. |
Аннотация: | Vapor pressures were measured for the system CHCl3/PEO 1000 (PEO stands for poly(ethylene oxide) and 1000 for Mw in kg/mol) at 25°C as a function of the weight fraction w of the polymer by means of a combination of headspace sampling and gas chromatography. The establishment of thermodynamic equilibria was assisted by employing thin polymer films. The degrees of crystallinity α of the pure PEO and of the solid polymer contained in the mixtures were determined via DSC. An analogous degree of polymer insolubility β was calculated from the vapor pressures measured in this composition range. The experiments demonstrate that both quantities and their concentration dependence are markedly affected by the particular mode of film preparation. These nonequilibrium phenomena are discussed in terms of frozen local and temporal equilibria, where differences between α and β are attributed to the occlusion of amorphous material within crystalline domains. Equilibrium information was obtained from two sources, namely from the vapor pressures in the absence of crystalline material (gas/liquid) and from the saturation concentration PEO (liquid/solid). The thermodynamic consistency of these data is demonstrated using a new approach that enables the modeling of composition dependent interaction parameters by means of two adjustable parameters only. |
Ключевые слова: | AMORPHOUS MATERIALS COMPOSITION CRYSTALLINE MATERIALS DIFFERENTIAL SCANNING CALORIMETRY GAS CHROMATOGRAPHY SOLVENTS VAPOR PRESSURE DEGREE OF POLYMER INSOLUBILITY DEGREES OF CRYSTALLINITY THERMODYNAMIC EQUILIBRIA POLYETHYLENE OXIDES |
URI: | http://elar.urfu.ru/handle/10995/111373 |
Условия доступа: | info:eu-repo/semantics/openAccess |
Идентификатор SCOPUS: | 0042320563 |
ISSN: | 0024-9297 |
Сведения о поддержке: | The authors are grateful to the “Deutscher Akademischer Austauschdienst” and to the Civilian Research and Development Foundation (USA, REC-005.2001) for financial support. |
Располагается в коллекциях: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
Файлы этого ресурса:
Файл | Описание | Размер | Формат | |
---|---|---|---|---|
2-s2.0-0042320563.pdf | 316,61 kB | Adobe PDF | Просмотреть/Открыть |
Все ресурсы в архиве электронных ресурсов защищены авторским правом, все права сохранены.