pH responsive surfaces with nanoscale topography (pages 2982–2990)
Antoine Bousquet, Emmanuel Ibarboure, Francisco J. Teran, Leire Ruiz, María Teresa Garay, José Manuel Laza, José Luis Vilas, Eric Papon and Juan Rodríguez-Hernández
Article first published online: 14 JUN 2010 | DOI: 10.1002/pola.24076
We prepared nanostructured adaptive polymer surfaces by diffusion of an amphihilic block copolymer towards the interface. The surface segregation of a diblock copolymer, polystyrene-block-poly(acrylic acid) (PS-b-PAA), occurred when blended with polystyrene employed as a matrix. Surface enrichment on diblock copolymer by water vapor annealing led to self-assembly occurring at the interface. Moreover, the PAA segments placed at the interface respond to pH and can switch from an extended hydrophilic state at basic pH values to a collapsed hydrophobic state in acidic media. Accordingly, the surface morphology changed from swelled micelles to nanometer size holes.