Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 85: Thin Films, Nanostructures and Nanoparticles I
O 85.2: Talk
Thursday, March 23, 2017, 10:30–10:45, ZEU 114
In situ GISAXS of gyroid terpolymer films during selective solvent annealing — James A. Dolan1, Karolina Korzeb2, Raphael Dehmel1, Bodo D. Wilts2, Karl C. Gödel1, Morgan Stefik3, Ulrich Wiesner3, Timothy D. Wilkinson1, Jeremy J. Baumberg1, Ullrich Steiner2, and •Ilja Gunkel2 — 1University of Cambridge, Cambridge, UK — 2Adolphe Merkle Institute, Fribourg, CH — 3Cornell University, Ithaca, NY, USA
Solvent annealing is an effective means to generate order in polymer systems. When solvent enters a film, the resultant plasticization drastically increases the mobility of the polymer chains. Annealing diblock copolymers in selective solvents has already been shown to induce morphological transitions from spheres to cylinders, gyroids, or lamellae. However, for the next more complicated family of linear block copolymers, triblock terpolymers, the morphological effect of selective solvent annealing is not well understood. Therefore, we present the results of in situ GISAXS during selective solvent annealing of gyroid-forming polyisoprene-b-polystyrene-b-poly(ethylene oxide) triblock terpolymer films. The selectivity was adjusted by using mixed vapor ratios of tetrahydrofuran and methanol. Distinct from diblock copolymers, we found that irrespective of the solvent vapor ratios used for annealing, the gyroid morphology remained. However, the selectivity of the solvent did either increase or decrease the unit cell size of the gyroid in both swollen and dried films.