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Block copolymer‐homopolymer blends in the disordered state: Determination of the interaction parameter using small angle neutron scattering
Author(s) -
Marie Pascal,
Selb Joseph,
Rameau Alain,
Gallot Yves
Publication year - 1988
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.19880160121
Subject(s) - copolymer , polybutadiene , scattering , materials science , neutron scattering , flory–huggins solution theory , small angle neutron scattering , range (aeronautics) , intensity (physics) , polymer chemistry , thermodynamics , physics , polymer , optics , composite material
The aim of this study was to determine the interaction parameter x AB and its variation with temperature from the intensity scattered By pure block copolymer (A‐B) and block copolymer‐homopolymer (B) blends where A is polydeuteratedstyrene and B polybutadiene. SANS experiments on pure copolymers of low molecular weight have shown that the scattering curve exhibits a peak of intensity related to the correlation hole effect. χ AB was determined by fitting the experimental curves using Leibler's theory and the law of variation of χ AB versus temperature was established. In the case of copolymer‐homopolymer blends, the scattering spectrum is modified because of a new and additional long range correlation effect (mixing effect) which dominates in the low q range and leads to strong forward scattering. We have not found any significant variation of χ with blend composition.