ABSTRACT:The viscosity of solutions of polystyrene (PS) in decahydronaphthalene (DHN) was measured in the presence of carbon dioxide (CO 2 ) with a moving-piston viscometer. The effects of the CO 2 pressure (0 -21 MPa), polymer concentration (1-15 wt %), temperature (306 -423 K), and polymer molecular weight (126 and 412 kDa) on the viscosity were investigated. In the absence of CO 2 , the increase in the viscosity with increasing polymer concentration was approximately exponential in concentration and was well described by the Martin equation. All the data fell on a single line when the relative viscosity was plotted against cM 0.50 (where c is the concentration of the polymer in solution and M is the molecular weight of the polymer). The viscosity of the polymer solution decreased with increasing CO 2 pressure under otherwise constant conditions. For a given CO 2 pressure, the viscosity reduction was greatest when the relative viscosity was high in the absence of CO 2 , that is, for high-molecular-weight polymer, high polymer concentrations, and low temperatures. Reductions in the relative viscosity of almost 2 orders of magnitude were observed in some cases. The viscosity of solutions of PS in DHN also was measured in the presence of sulfur hexafluoride (SF 6 ). At a given pressure, SF 6 was about as effective as CO 2 in reducing the solution viscosity.
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