Viscoelastic effects in dynamics of concentration fluctuations in dynamically asymmetric polymer blends | Zendy

Takenaka Mikihito | Zendy; Takeno Hiroyuki | Zendy; Hashimoto Takeji | Zendy; Nagao Michihiro | Zendy

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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.

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