The phase diagram, the Flory-Huggins parameter Gamma, and the Ginzburg para
meter Gi of a concentrated mixture of a polybutadiene;polystyrene diblock c
opolymer and 1,2 dichlorobenzene were determined by small-angle neutron sca
ttering in pressure fields between 0.1 and 200 MPa. The ordering temperatur
e could be sufficiently well described by the theory of concentrated soluti
ons. (C) 2000 Elsevier Science B.V. All rights reserved.