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Viscoelastic effects in dynamics of concentration fluctuations in dynamically asymmetric polymer blends
Author(s) -
Takenaka Mikihito,
Takeno Hiroyuki,
Hashimoto Takeji,
Nagao Michihiro
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/s0021889803006149
Subject(s) - viscoelasticity , radius of gyration , polymer , thermodynamics , radius , deuterium , gyration , polybutadiene , relaxation (psychology) , phase (matter) , chemistry , neutron scattering , materials science , scattering , physics , optics , atomic physics , organic chemistry , psychology , social psychology , geometry , computer security , mathematics , computer science , copolymer
Relaxation processes of the concentration fluctuations induced by a rapid pressure change were investigated for a dynamically asymmetric polymer blend (deuterated polybutadiene (DPB) / polyisoprene (PI)) with a composition of 50/50 by weight in one phase region by using time‐resolved small‐angle neutron scattering. The theoretical analysis yielded the wave‐number q ‐dependence of Onsager kinetic coefficient which is characterized by a q ‐2 ‐dependence at qξ ve >1 with the characteristic length ξ ve being much larger than radius of gyration of DPB or PI. The estimated ξ ve agrees well with that calculated using the theory by Doi & Onuki, which takes into account viscoelastic effects.