Regensburg 2013 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 16: Interfaces and Thin Films II (joint session with DECHEMA and VDI)
CPP 16.2: Talk
Tuesday, March 12, 2013, 10:00–10:15, H40
Vapor treatment of diblock copolymer thin films with perpendicular lamellar structure — •Jianqi Zhang1, Alessandro Sepe2, Dorthe Posselt3, Jan Perlich4, Xuhu Shen1, Detlef-M Smilgies5, and Christine Papadakis1 — 1TU München, Physikdepartment, Fachgebiet Physik weicher Materie, Garching, Germany — 2University of Cambridge, Department of Physics, UK — 3Roskilde University, IMFUFA, Denmark — 4HASYLAB at DESY, Hamburg, Germany — 5Cornell University, CHESS, Ithaca NY, USA
Solvent vapor treatment results in complex swelling kinetics in self-assembled thin films. We have investigated the structural changes of P(S-b-B) diblock copolymer thin films with perpendicular lamellar structure using in-situ, real-time grazing-incidence small-angle X-ray scattering. Cyclohexane (CHX), which is slightly selective for the PB block, was used to vapor-treat the films. For the as-prepared film, the image displays straight diffuse Bragg rods (DBRs), which indicate the perpendicular lamellar orientation. During vapor treatment, the DBRs bend inwards which we attribute to tilting of a fraction of the lamellae away from the purely perpendicular orientation. Upon subsequent drying, straight DBRs reappear, i.e. the perpendicular orientation is recovered. Additional narrow and elongated DBRs appear during the final stage of the drying process. This finding points to the protrusion of PS domains at the film surface because the PB domains dry more slowly.