pH-sensitive behavior of the PS-b-PDMAEMA copolymer at the air - water interface
Research output: Contribution to journal › Journal article › Research › peer-review
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 sigma and pH of the subphase. At pH = 2, the PDMAEMA is fully charged and the system at high s 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.
Original language | English |
---|---|
Article number | 123619 |
Journal | Polymer |
Volume | 221 |
Number of pages | 9 |
ISSN | 0032-3861 |
DOIs | |
Publication status | Published - 14 Apr 2021 |
- Amphiphilic diblock copolymers, Polyelectrolytes, Neutron reflectivity, Polymer at the air/water interface, Polyelectrolyte brush, Scaling laws
Research areas
ID: 261608619