A series of mixtures composed of a symmetric A-B diblock copolymer and a symmetric blend of A and B homopolymers was investigated by small-angle neutron scattering. Mean-field theory predicts that a line of lamellar-disorder transitions with wave-vector instability q*>0 will meet a line of critical points with q*=0 in the three-component mixture at an isotropic Lifshitz point. Mean-field Lifshitz behavior (γ=1 and ν=1/4) was observed in the disordered state at the anticipated composition to within 1 K of the phase transition.
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Bates et al. (1995) studied this question.
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