Micellization of Diblock and Triblock Copolymers in Aqueous Solution. New Results for Oxyethylene/ Oxybutylene Copolymers E38B12 and E21B11E21. Comparison of Oxyethylene/Oxybutylene, Oxyethylene/Oxypropylene, and Oxyethylene/Alkyl Systems
| Autor: | David Attwood, Zukang Zhou, Ga-Er Yu, Nanjie Deng, Colin Booth, Yung-Wei Yang |
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| Rok vydání: | 1995 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution Surfaces and Interfaces Condensed Matter Physics Micelle Gibbs free energy Gel permeation chromatography symbols.namesake Anionic addition polymerization chemistry Dynamic light scattering Polymer chemistry Electrochemistry symbols Copolymer General Materials Science Spectroscopy Alkyl |
| Zdroj: | Langmuir. 11:4703-4711 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la00012a021 |
| Popis: | Two oxyethylene/oxybutylene block copolymers of similar chain length and composition, E 38 B 12 and E 21 B 11 E 21 , were prepared by sequential anionic polymerization and characterized by gel permeation chromatography and NMR spectroscopy. Their association in dilute aqueous solution was investigated by static and dynamic light scattering. Both copolymers associated by closed processes to form micelles, those of the diblock copolymer being the larger. The increment per B unit in the standard Gibbs energy of micellization of diblock E m B n copolymers was found to be 2.0 kJ mol -1 . The critical micelle concentrations of oxyethylene/oxybutylene (EmBn and E m B n E m ), oxyethylene/alkyl (E m C n ), and oxyethylene/oxypropylene (E m P n E m ) copolymers are compared, and the effect of chain architecture (diblock and triblock) on the association of diblock and triblock copolymers is discussed. |
| Databáze: | OpenAIRE |
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