Catherine A. Kelly, Andrew Naylor, Lisbeth Illum, Kevin M. Shakesheff and Steven M. Howdle Supercritical CO2: A Clean and Low Temperature Approach to Blending PDLLA and PEG Advanced Functional Materials 22
Supercritical CO2 (scCO2) is used to blend polymers poly(D,L-lactic acid) (PDLLA) and poly(ethylene glycol) (PEG) at surprisingly low temperatures. Differential scanning calorimetry (DSC) data highlight an unusual region of polymer miscibility between 8 and 25 wt% PEG. This miscibility region directly affects the viscosity of the blends in scCO2 and the particle yield from spraying. The particles produced also confirm the presence of this miscibility region.
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