Critical behaviour of blend solutions of polystyrene (Mw=3.55 x 105)/poly(methyl methacrylate) (M w = 3.27 x l0 s) in d6-benzene was investigated by static light scattering. The phase diagram (spinodal, binodal and cloud points) was determined at a fixed total polymer concentration. The system had the lower critical solution temperature. The inverse isothermal osmotic compressibility (a~/~ci) r and correlation length ~ of concentration fluctuations were determined as functions of the reduced temperature e-= I TdT- I I near the stability limit, where T is the absolute temperature and T~ is the spinodal temperature. Both (OTz/~ci) r and ~ were described by single exponents over the investigated temperature range. The critical exponents 7 and v for (dlt/aci)r and ~ were 1.23 and 0.63, respectively. They were very close to the three-dimensional Ising exponents and obviously different from the mean-field or Fisher's renormalized Ising exponents, as theoretically predicted by Broseta et el.
Посилання на статтю:
Critical exponents and phase diagram of polymer blend solutions: polystyrene/ poly(methyl methacrylate)/ds-benzene system / Naoshi Miyashita, Mamoru Okada and Takuhei Nose // Polymer. – 1994. – Vol 35. – P. 1038-1043.