Poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) Copolymer 2D Single Network at the Air-Water Interface
| Autor: | Sophie Cantin, Ellen H. G. Backus, Patrick Ober, Ferhat Haroun, Alae El Haitami |
|---|---|
| Přispěvatelé: | IoP (FNWI), Soft Matter (WZI, IoP, FNWI), CY Cergy Paris Université (CY) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Langmuir
Materials science 02 engineering and technology 010402 general chemistry 01 natural sciences Polyvinyl alcohol Aldehyde chemistry.chemical_compound Monolayer Electrochemistry Copolymer [CHIM]Chemical Sciences Molecule General Materials Science ComputingMilieux_MISCELLANEOUS Spectroscopy chemistry.chemical_classification Aqueous solution technology industry and agriculture Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences chemistry Chemical engineering 0210 nano-technology Ethylene glycol |
| Zdroj: | Langmuir, 36(31), 9142-9152. American Chemical Society Langmuir Langmuir, American Chemical Society, 2020, 36 (31), pp.9142-9152. ⟨10.1021/acs.langmuir.0c01398⟩ |
| ISSN: | 0743-7463 1520-5827 |
| DOI: | 10.1021/acs.langmuir.0c01398⟩ |
| Popis: | In this work, Langmuir monolayers based on poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol) (PEG-PPG-PEG) triblock copolymer were in situ stabilized at the air-water interface in the presence of a cross-linking agent, benzene-1,3,5-tricarboxaldehyde (BTC), in the aqueous subphase. The reaction takes place through acid-catalyzed acetalization between the terminal hydroxyl groups of the copolymer and aldehyde functions of the BTC molecules. Mean area per repeat unit measurements as a function of the reaction time show a significant monolayer contraction associated with an increase in its compressibility modulus. In addition, Brewster angle microscopy observations indicate the appearance of higher-density two-dimensional domains, irreversibly formed at constant surface pressure. This is also confirmed on a smaller scale by atomic force microscopy (AFM). These arguments, consistent with copolymer monolayer cross-linking in acidic medium, are supported in situ at the air-water interface by sum-frequency generation (SFG) spectroscopy. Furthermore, PEG-PPG-PEG monolayer cross-linking is not evidenced in alkaline medium, in coherence with the interfacial acid-catalyzed acetalization. |
| Databáze: | OpenAIRE |
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