Coexistence curve of a polydisperse polymer solution near the critical point

The coexistence curve of well-characterized polydisperse polystyrene in cyclohexane (${\mathrm{M}}_{\mathrm{w}}$ =23.9×${10}^4$ , ${\mathrm{M}}_{\mathrm{w}}$ /${\mathrm{M}}_{\mathrm{n}}$ =2.8) was measured near the critical point, where ${\mathrm{M}}_{\mathrm{w}}$ and ${\mathrm{M}}_{\mathrm{n}}$ are weight- and number-average molecular weights, respectively. The shape of the coexistence curve was expressed by the critical exponent ${\mathrm{{\rm B}}}_{\mathrm{t}}$ =0.363±0.005, which agrees with the exponent of Fisher's renormalization for the Ising system with hidden variables.