The effect of heat treatment on the internal structure of nanostructured block copolymer films

Alessandro Sepe, E T Hoppe, S Jaksch, D Magerl, Q Zhong, Jan Perlich, Dorthe Posselt, Detlef-M. Smilgies, Christine M. Papadakis

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstrakt

We report on the temperature dependence of the nanostructure of thin block copolymer films, as studied using in situ grazing-incidence small-angle x-ray scattering (GISAXS). We focus on spin-coated poly(styrene-b-butadiene) diblock copolymer thin films featuring lamellae perpendicular to the substrate. In situ GISAXS measurements elucidate the structural changes during heat treatment at temperatures between 60 and 130 ◦C. Thermal treatment below 100 ◦C
does not destroy the perpendicular lamellar order. In contrast, treatment between 105 and 120 ◦C leads to a broad distribution of lamellar orientations which only partially recovers upon subsequent cooling. Treatment at 130 ◦C leads to severe changes of the film structure. We attribute the change of behavior at 100 ◦C to the onset of the glass transition of the polystyrene block and the related increase of long-range mobility. Our results indicate that the perpendicular lamellar orientation for high molar mass samples is not stable under all conditions.
OriginalsprogEngelsk
TidsskriftJournal of Physics: Condensed Matter
Vol/bind23
Sider (fra-til)254213
Antal sider9
ISSN0953-8984
DOI
StatusUdgivet - 2011

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