Surface-induced breakout crystallization in cylinder-forming P(I-b-EO) diblock copolymer thin films
| Autor: | Ezzeldin Metwalli, K. Troll, Stephan Förster, Christine M. Papadakis, Z. Di, Charles Darko, Andreas Timmann, Günter Reiter |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Ethylene Oxide
Time Factors Materials science Surface Properties Film plane Biophysics Microscopy Atomic Force Phase Transition law.invention Crystallinity Hemiterpenes X-Ray Diffraction law Scattering Small Angle Copolymer Transition Temperature General Materials Science Soft matter Thin film Crystallization Scattering Surfaces and Interfaces General Chemistry Amorphous solid Refractometry Chemical engineering Biotechnology |
| Zdroj: | Papadakis, C, Darko, C, Di, Z, Troll, K, Metwalli, E, Timmann, A & Förster, S 2011, ' Surface-induced breakout crystallisation in cylinder-forming P(I-b-EO) diblock copolymer thin films ', European Physical Journal E. Soft Matter, vol. 34, no. 7 . https://doi.org/10.1140/epje/i2011-11007-x |
| ISSN: | 1292-895X 1292-8941 |
| DOI: | 10.1140/epje/i2011-11007-x |
| Popis: | We have found very slow crystallization in thin films of cylinder-forming poly(isoprene- b -ethyleneoxide) (P(I- b -EO)) diblock copolymers with PEO being the minority block. The film was crystallized at room temperature after melting at 62 ° C . Imaging methods were combined with X-ray reflectometry and grazing-incidence small-angle X-ray scattering and diffraction. Initially, hexagonally packed, amorphous PEO cylinders lie in the film plane. After 148 days, crystallized, finger-like terraces were observed over the entire film surface. The terrace height is 20% higher than the repeat distance in the as-prepared film. Thus, at the film surface, the cylinders have been destroyed by crystalline lamellae lying in the film plane. The PEO chain stems are perpendicular to the substrate surface and are once-folded and fully interdigitated. The substrate-near layers still consist of the hexagonally packed, amorphous PEO cylinders within the PI matrix. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink