抄録
By means of a high pressure rheometer designed to study the viscoelastic behaviour of polymeric liquids under high pressure, the viscosity of polystyrene (Mv; 1.88×105) solutions in toluene was measured over a wide range of concentration (c: 0.03-0.50) under various pressures up to 900 kg/cmcm2. The effects of pressure on the viscosity and critical concentration were discussed.
The effect of pressure on the viscosity (logηp/ηo) above critical concentration cc was shown to increase with the increase of the concentration. Below cc, this effect was similar to that with the solvent and independent of the concentration. The log(ηp/ηo) was proportional to Pn. It is evident that these results can be described by combining the empirical equation and the viscosity equation proposed by Onogi.
It is found also that cc is slightly shifted to lower concentrations with the elevation of pressure.
