Journal article
Crystallization in diblock copolymer thin films at different degrees of supercooling
Technical University of Munich1
Institut de Chimie de Surfaces et Interfaces2
Norwegian University of Science and Technology3
Solar Energy Programme, Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
Risø National Laboratory for Sustainable Energy, Technical University of Denmark5
German Electron Synchrotron6
Cornell University7
The crystalline structures in thin films of polystyrene-b-poly(ethylene oxide) (PS-b-PEO) diblock copolymers were studied in dependence on the degree of supercooling. Atomic force microscopy showed that the crystalline domains (lamellae) consist of grains, which are macroscopic at low and intermediate degrees of supercooling, but of submicrometer size for strong supercooling.
Using grazing-incidence wide-angle x-ray scattering, we could determine the grain orientation distribution function which shows that the chain stems are perpendicular to the lamellae at low supercooling, but tilted at intermediate and strong supercooling. These results suggest that, at intermediate and strong supercooling, the crystalline PEO lamellae do not grow homogeneously, but by the formation of small crystallites at the growth front.
Language: | English |
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Year: | 2009 |
Pages: | 041802 |
ISSN: | 24700053 , 24700045 , 15502376 and 15393755 |
Types: | Journal article |
DOI: | 10.1103/PhysRevE.79.041802 |
ORCIDs: | Andreasen, Jens Wenzel |