Dresden 2014 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 11: Interfaces and Thin Films I
CPP 11.3: Talk
Monday, March 31, 2014, 17:00–17:15, ZEU 114
Structural evolution of perpendicular lamellae in diblock copolymer thin films during solvent vapor treatment investigated by GISAXS — •Jianqi Zhang1, Dorthe Posselt2, Alessandro Sepe1, Xuhu Shen1, Jan Perlich3, Detlef-M. Smilgies4, and Christine M. Papadakis1 — 1TU München, Physik-Department, Garching — 2IMFUFA, Roskilde University, Denmark — 3DESY, Hamburg — 4Cornell University, Ithaca, NY, USA
Drastic structural rearrangements in block copolymer thin films occur during solvent vapor treatment. Their understanding is mandatory for the use of solvent vapor treatment for annealing defects otherwise hampering applications. We investigate the structural evolution in poly(styrene-b-butadiene) (P(S-b-B)) diblock copolymer thin films featuring perpendicular lamellae. The changes during solvent vapor treatment are studied in-situ using time-resolved grazing-incidence small-angle X-ray scattering (GISAXS) [1]. The swelling of the film is one-dimensional along the substrate normal. During swelling, the initially perpendicular lamellae tilt within the film to be able to shrink, as confirmed by computer simulations [2]. In contrast, at the film surface, the lamellae stay perpendicular, and eventually vanish at the expense of a thin PB wetting layer. During the subsequent drying, the perpendicular lamellae reappear at the surface, and finally, PS blocks protrude. By modeling, the time-dependent height of the protrusions can be quantitatively extracted.
1. J. Zhang et al., Macromol. Rapid Commun. 34, 1289 (2013)
2. A.A. Rudov et al., Macromolecules 46, 5786 (2013)