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Influence of Temperature and Type of Solvents on the Microdomain Orientation of PS ‐ b ‐ P 2 VP Ultrathin Films by Solvent Annealing
Author(s) -
Shamsudin Siti Aisyah B.,
Sakaguchi Go,
Takenaka Mikihito,
Hasegawa Hirokazu
Publication year - 2013
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201350508
Subject(s) - annealing (glass) , solvent , toluene , copolymer , materials science , polystyrene , polymer chemistry , acetone , perpendicular , chemical engineering , solvent effects , crystallography , analytical chemistry (journal) , chemistry , composite material , chromatography , organic chemistry , polymer , geometry , mathematics , engineering
Summary The effect of temperature and type of solvent on the microdomain orientation during solvent‐annealing of block copolymer ultrathin films on silicon substrates was investigated using asymmetric polystyrene‐ block ‐poly(2‐vinylpyridine) (PS‐ b ‐P2VP) diblock copolymer. When the solvent‐annealing was performed with THF at 20°C, the ultrathin film exhibited a mixed orientation of cylinders parallel and perpendicular to the substrate while at 25°C only parallel cylinders were observed by AFM. The solvent annealing with acetone gave a dot pattern at 20°C and a line pattern at 25°C. On the other hand, in the case of solvent‐annealing with toluene perpendicular cylinders were observed at 25°C while at 20°C the morphology was not clear. The orientation and morphology of microdomains as well as the kinetics in PS‐ b ‐P2VP ultrathin films on solvent‐annealing is significantly affected by temperature and type of solvent. By controlling temperature and selecting the solvent, perpendicular cylinders can be formed predominantly on the substrates.