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Singular value decomposition analysis of time‐resolved small‐angle X‐ray scattering during morphological transition in a block copolymer
Author(s) -
Okamoto Shigeru,
Sakurai Shinichi
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/s0021889803008483
Subject(s) - small angle x ray scattering , copolymer , lamellar structure , polystyrene , scattering , materials science , volume fraction , glass transition , polymer chemistry , analytical chemistry (journal) , crystallography , composite material , optics , chemistry , polymer , physics , chromatography
Time‐resolved small‐angle X‐ray scattering (TR‐SAXS) studies of the structural changes in a block copolymer after a temperature jump are reported. The sample used was a polystyrene‐ block ‐poly(ethylene‐ alt ‐butylene)‐ block ‐polystyrene (SEBS) triblock copolymer, which has a number‐average molecular weight of 54000 g mol −1 and a volume fraction of polystyrene of 0.227. The film specimen was prepared by the solution‐cast method using a selective solvent. The as‐cast specimen with lamellar microdomains underwent the temperature jump from 363 to 403 K and the morphological transition from lamellae to cylinders was observed as a function of time by the TR‐SAXS technique. The singular value decomposition (SVD) analysis was performed on the scattering profiles. This analysis strongly suggested the existence of a third basis component of the X‐ray scattering profiles, thus supporting that there is an intermediate state during the transition from lamellae to cylinders.