Flory-Huggins (FH) theory is restricted to polymer mixtures whose monomers are structurally identical- a situation limited to isotopic blends and computer simulations. We systematically investigate the influence of monomer structure on blend miscibility and scattering properties using the lattice cluster theory (LCT) generalization of the FH model. Monomer structural assymetry is shown to profoundly affect blend miscibility, chain swelling and the scale and intensity of composition fluctuations. Four distinct miscibility classes are identified and experimental evidence for these classes is discussed.
Citation: Physical Review Letters
Issue: No. 9
Pub Type: Journals
blend miscibility classes, critical temperature, Flory-Huggins theory, monomer structure, phase separation, polymer blends, simplified lattice cluster theory, structural asymmetry, theta temperature