Abstract
Thermal composition fluctuations were measured in a homopolymer blend dPB/PS (dPB/dPS) of critical composition mixed with different amounts of a symmetric diblock copolymer dPB–PS (PB and PS being polybutadiene and polystyrene, respectively) with small-angle neutron scattering (SANS). From thermal fluctuations the two-phase boundary, two critical universality classes and the Lifshitz line were derived. The bicontinuous microemulsion phase could be identified by the characteristic peak positions of samples prepared in bulk, block and film contrast. A non-monotonic Lifshitz line (LL) showing a dependence on temperature was found. LL is located in the disordered and bicontinuous microemulsion phase.
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