Journal article

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
  • English
Classification
Chemistry
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/301088
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