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High-pressure density and viscosity of polystyrene solutions in methylcyclohexane

✍ Scribed by Sang-Do Yeo; Erdogan Kiran

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
398 KB
Volume
15
Category
Article
ISSN
0896-8446

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✦ Synopsis

High-pressure density and viscosity data of polystyrene solutions in methylcyclohexane have been generated at 340, 360, 380 and 400 K using a falling-cylinder type viscometer up to 35 MPa. Measurements were conducted with two different molecular weight polystyrene samples (M w =50 000 and 700 000) in the concentration ranges of 3-14 wt.% (for M w =50 000) and 1-5 wt.% (for M w =700 000). Isothermal density and viscosity of these solutions increased linearly with pressure in all the concentration ranges investigated. The flow activation volume and flow activation energy of the polymer solutions were in the range of 29-55 cm3 mol-1 and 7-10 kJ mol-1, respectively. It was found that the activation volume increased with temperature, and the activation energy decreased with pressure. Viscosity was correlated with density employing a Doolittle type equation g=A exp[B/(1-V 0 r)]. The estimated closed packed volumes (V 0 ) from these correlations were in the range of 0.66-0.72 cm3 g-1 for these solutions.

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