Coupling between mean curvature and textures in block copolymer thin films deposited on curved substrates

DA VEGA; GOMEZ LR; PEZZUTTI A; PRADO, F; CHAIKIN PM; REGISTER RA

SOFT MATTER

ROYAL SOC CHEMISTRY

Lugar: CAMBRIDGE; Año: 2013 vol. 9 p. 9385 - 9391

1744-683X

We study the dynamics of coarsening in a cylinder-forming polystyrene-block-poly(ethylene-alt-propylene)block copolymer thin film deposited on a topographically patterned substrate. Thermal annealing leads tohighly ordered arrays of polystyrene cylinders embedded in the poly(ethylene-alt-propylene) matrix, lyingin-plane and oriented perpendicular to the trenches of the substrate. We show that this configurationcorresponds to an equilibrium state. The coupling between the block copolymer morphology and themean curvature of the substrate is dictated by the out-of-plane deformations of the block copolymerstructure. Thus, with appropriate control over the substrate features, it should be possible to obtainnovel structures with controlled orientation.