Abstract
The solubility of supercritical carbon dioxide (scCO 2) in poly( l-lactide) and poly( d, l-lactide- co-glycolide) at different temperatures (308, 313 and 323 K) and pressures (10–30 MPa) was measured using a magnetic suspension balance. The solubility data were also used for estimating the binary diffusion coefficients. The results show a good solubility of CO 2 in both polymers: up to 43% in poly( l-lactide) and 30% in poly( d, l-lactide- co-glycolide). The diffusion coefficients have high values, which verify the liquid-like solvating properties of scCO 2. The diffusion coefficient depends on the quantity of gas already absorbed by the polymer; its values decrease with increasing gas concentration.
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