Session L36 - General Poster Session II.
POSTER session, Wednesday morning, March 22
Exhibit Hall, MCC
Commensurability of chemical and physical length scales between substrate heterogeneity and copolymer morphology has been shown to induce control over block copolymer ordering in thin films. In thicker films, free surface effects compete with substrate incuded ordering and prevent the oriented morphology from propagating throughout the entire film thickness. Herein we examine the crossover region between substrate control and free surface effects. Varying both film thickness and solvent casting under different conditions, as well as spin casting and annealing, we probe the effects of competing free surface and substrate control.