Interface-induced morphology transition in triblock copolymer films swollen with low-molecular-weight homopolymer
- Müller-Buschbaum, P. Institut für Werkstoffforschung, GKSS-Forschungszentrum Geesthacht, Germany - Technische Universität München, Physik department, Garching, Germany
- Schulz, Leander Technische Universität München, Physik department, Garching, Germany - Université de Fribourg, Physics Department, Switzerland
- Metwalli, E. Technische Universität München, Physik department, Garching, Germany
- Moulin, J.-F. Technische Universität München, Physik department, Garching, Germany - Institut für Werkstoffforschung, GKSS-Forschungszentrum Geesthacht, Germany
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28.10.2008
Published in:
- Langmuir. - 2009, vol. 25, no. 7, p. 4235–4242
English
The morphology transition due to midblock swelling with low-molecular-weight homopolymer polystyrene of an ABA-type triblock copolymer polyparamethylstyrene-block-polystyrene-block-polyparamethylstyrene at the buried silicon substrate interface is studied as a function of different substrate surface treatments. With grazing incidence small-angle neutron scattering (GISANS), high interface sensitivity is reached. The powderlike oriented lamellar structure in the bulk becomes oriented along the surface normal in the vicinity of the substrate. A transition of the lamellar into a cylinder phase at the polymer−silicon interface is probed with GISANS. The transition is induced by the addition of the homopolymer, but the modification of the short-ranged interface potential of the substrate influences the amount of homopolymer that is necessary for this transition. Without and with 0.1 vol % added homopolymer, the lateral spacing is stretched at the interface as compared to the bulk whereas for a higher added amount of homopolymer no stretching occurs.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Chemistry
- License
- License undefined
- Identifiers
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- RERO DOC 11717
- DOI 10.1021/la802471p
- Persistent URL
- https://folia.unifr.ch/unifr/documents/301088
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