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Pressure dependence of thermal fluctuation effects on the order–disorder transition of diblock copolymer solutions
Author(s) -
Miyazawa Masaaki,
Takenaka Mikihito,
Miyajima Tatsuya,
Hashimoto Takeji
Publication year - 2003
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889803003911
Subject(s) - copolymer , polystyrene , materials science , thermal , thermal fluctuations , polymer , scattering , thermodynamics , transition temperature , polymer chemistry , condensed matter physics , physics , optics , composite material , superconductivity
We have investigated the pressure dependence of the order‐disorder transition behavior, which is characterized by the strength of thermal fluctuation effects and the order‐disorder transition temperature (T ODT ), for compositionally nearly symmetric polystyrene‐ block ‐polyisoprene diblock copolymer solution and the bulk with the small‐angle X‐ray scattering method. In the solution, thermal fluctuation effects and T ODT increases with pressure. On the other hand, in the bulk, T ODT increases with pressure, while thermal fluctuations effects decrease with pressure. Concentration fluctuations between polymers and solvent are considered to cause the difference between these results for the solution and the bulk.