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The effect of catalyst composition on the hydrogenation of the aromatic rings of polystyrene dissolved in carbon dioxide-expanded decahydronaphthalene (CO 2 -DHN) was studied using a slurry reactor at 150°C. Catalyst deactivation occurred within 15min of the addition of CO 2 to the reactor when 5% Pd/SiO 2 or 5% Pd/Al 2 O 3 was used as the catalyst. The deactivation...
The effect of prepolymer crystallinity on the solid-state polymerization (SSP) of poly(bisphenol A carbonate) was examined using nitrogen as a sweep fluid. A low-molecular-weight prepolymer was synthesized by melt transesterification and prepolymers with different crystallinities (11.7%, 23.3%, 33.7%) were prepared with supercritical carbon dioxide treatment. SSP of the three prepolymers was then...
The diffusion coefficients of polystyrene (PS) in decahydronaphthalene (DHN) and in solutions of carbon dioxide (CO 2 ) and DHN were measured for dilute PS solutions over a range of temperatures and CO 2 –DHN ratios using high pressure dynamic light scattering. Infinite dilution diffusion coefficients (D 0 ) of PS and dynamic second virial coefficients (k D ) were determined...
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