pH-sensitive behavior of the PS-b-PDMAEMA copolymer at the air - water interface
| Autor: | Alessandra Luchini, Philippe Fontaine, Michel Goldmann, Patrick Perrin, François Muller, Fabrice Cousin, Nadège Pantoustier, Louis Bondaz |
|---|---|
| Přispěvatelé: | Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Laboratoire Léon Brillouin (LLB - UMR 12), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay, Sciences et Ingénierie de la Matière Molle (UMR 7615) (SIMM), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, Université de Paris - UFR Sciences Fondamentales et Biomédicales [Sciences], Université de Paris (UP), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), UFR Sciences Fondamentales et Biomédicales [Sciences] - Université Paris Cité, Université Paris Cité (UPCité) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Phase transition
Langmuir Materials science Polymers and Plastics 02 engineering and technology 010402 general chemistry Methacrylate Surface pressure Polymer at the air/water interface 01 natural sciences [SPI]Engineering Sciences [physics] Monolayer Materials Chemistry Copolymer Specular reflection Scaling laws Neutron reflectivity Organic Chemistry Polyelectrolyte brush 021001 nanoscience & nanotechnology Polyelectrolytes Polyelectrolyte Amphiphilic diblock copolymers 0104 chemical sciences Chemical engineering 0210 nano-technology [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] |
| Zdroj: | Polymer Polymer, Elsevier, 2021, 221, pp.123619. ⟨10.1016/j.polymer.2021.123619⟩ Polymer, 2021, 221, pp.123619. ⟨10.1016/j.polymer.2021.123619⟩ |
| ISSN: | 0032-3861 |
| Popis: | International audience; We investigated the behavior of a pH-responsive polystyrene-b-poly(2-dimethylamino)ethyl methacrylate (PS-b-PDMAEMA) diblock copolymer at the air/water interface. We synthetized different copolymers with a small hydrophobic PS block of constant length attached to polyelectrolyte PDMAEMA blocks of various lengths. We demonstrate that a Langmuir monolayer is formed with the hydrophobic collapsed PS block anchoring the hydrophilic polyelectrolyte at the interface. By combining macroscopic surface pressure measurements and specular neutron reflectivity, we studied the monolayers as a function of surface density σ and pH of the subphase. At pH = 2, the PDMAEMA is fully charged and the system at high σ behaves as a polyelectrolyte brush with chains protruding in water with a gaussian profile. At pH = 10 where the PDMAEMA is neutral, the system exhibits a phase transition between the pancake configuration to the brush configuration, with a threshold that depends on the PDMAEMA chain length, in agreement with theoretical predicted scaling laws. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect