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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 4: Crystallization, Nucleation and Self Assembly I
CPP 4.7: Vortrag
Montag, 31. März 2014, 11:15–11:30, ZEU 114
An in situ GISAXS study of BCP thin films during annealing in neutral and in selective solvent vapors — •Ilja Gunkel1,2, Xiaodan Gu2, Alexander Hexemer1, and Thomas Russell2 — 1Lawrence Berkeley National Laboratory, Berkeley, USA — 2University of Massachusetts, Amherst, USA
Solvent vapor annealing (SVA) is a means to achieve lateral order of block copolymer (BCP) microdomains in thin films but the underlying mechanism of the ordering process is ill-understood. Here, we used real time in situ grazing-incidence small-angle x-ray scattering (in situ GISAXS) to investigate the ordering of BCP microdomains as solvent vapor was added or removed. We systematically studied the influence of the amount of swelling and solvent removal rate on the lateral order of BCP microdomains in neutral and selective solvent vapors, respectively. In case of neutral solvent vapor larger grain sizes were observed at higher swelling while for selective solvent vapor high swelling induced changes in the packing of microdomains. The effect of solvent removal on the degree of lateral order was studied by deswelling films at different removal rates. Here, we observed a substantial deterioration of lateral order of microdomains in selective solvent vapor that is significantly stronger than in neutral solvent vapors, where the fastest solvent removal rate even allowed to freeze in the ordered microdomain structure of the swollen BCP film.