MICROSTRUCTURE AND ISOTOPIC LABELING EFFECTS ON THE MISCIBILITY OF POLYBUTADIENE BLENDS STUDIED BY THE SMALL-ANGLE NEUTRON-SCATTERING TECHNIQUE

Deuterated polybutadiene and protonated polybutadiene (PBD/PBH) blends with various microstructures have been studied by the small-angle neutron scattering experiments. Correlation length ζ, zero wavenumber structure factor, S(q = 0), and interaction parameter, χblend, have been obtained. All PBD/PBH blends exhibit UCST behavior. With the use of random copolymer theory, the interaction parameter, χblend, has been successfully separated into χ1, χ2, and χ3 which are interaction parameters between the same isotopically labeled 1,2-unit and 1,4-unit, the opposite isotopically labeled 1,2-unit and 1,4-unit, and the opposite isotopically labeled 1,2-unit and 1,2-unit or 1,4-unit and 1,4-unit, respectively. © 1990, American Chemical Society. All rights reserved.