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Neutron and light scattering studies of polymer blends and block copolymers
Author(s) -
Fischer E. W.,
Jung W. G.
Publication year - 1989
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19890260119
Subject(s) - copolymer , random phase approximation , neutron scattering , materials science , diffusion , polymer , scattering , mean field theory , phase (matter) , thermal fluctuations , thermal expansion , neutron , thermodynamics , condensed matter physics , statistical physics , physics , optics , nuclear physics , quantum mechanics , composite material
The structure of compatible polymer mixtures and its temperature dependence can be well described in many cases by the mean‐field approximation. Deviations with regard to the temperature dependence of the correlation length of concentration fluctuations can be explained by taking into account the spatial structure of the interaction potential. Concentration fluctuations and the microphase separation in diblock copolymers are in good agreement with theories based on the random phase approximation. In the two‐phase region the temperature dependence of the scattered X‐ray or neutron intensity is governed by the difference in the thermal expansion coefficients of the two components of the diblock copolymer. Photon correlation spectroscopy (PCS) yields valuable information on the concentration dependence of the mutual diffusion coefficient D AB .