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Ternary mixture of a homopolymer blend and diblock copolymer studied near the Lifshitz composition by small‐angle neutron scattering
Author(s) -
Mortensen K.,
Schwahn D.,
Frielinghaus H.,
Almdal K.
Publication year - 2000
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/s0021889899013187
Subject(s) - structure factor , ternary operation , copolymer , phase diagram , scattering , neutron scattering , critical point (mathematics) , small angle scattering , polymer blend , materials science , condensed matter physics , small angle neutron scattering , binary number , thermodynamics , physics , ising model , position (finance) , phase (matter) , optics , polymer , nuclear magnetic resonance , mathematics , quantum mechanics , mathematical analysis , arithmetic , computer science , programming language , finance , economics
A ternary mixture of two homopolymers and the corresponding diblock copolymer represents a good model system to study critical phenomena near the mean field predicted Lifshitz point. The structure factor of concentration fluctuations is in this regime of the phase diagram described by a formula which independently accounts for the peak‐position q *, the scattering intensity at q *, S ( q *), and the forward scattering, S (0). The susceptibility, which is given by the maximum value of either S (0) or S ( q *), shows markedly renormalized critical behavior with critical exponents significant larger than the 3d‐Ising value relevant for simple binary blends.