Phase behavior of polylactides in solvent-nonsolvent mixtures

Witte van de, P. and Dijkstra, P.J. and Berg van den, J.W.A. and Feijen, J. (1996) Phase behavior of polylactides in solvent-nonsolvent mixtures. Journal of Polymer Science, Part B: Polymer physics, 34 (15). pp. 2553-2568. ISSN 0887-6266

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Abstract:	Isothermal phase diagrams for the semicrystalline poly-L-lactide (PLLA) and the amorphous poly-DL-lactide (PDLLA) in combination with several solvent-nonsolvent combinations (dioxane/water, dioxane/methanol, chloroform/methanol, and NMP/water) have been determined. The locations of the liquid-liquid miscibility gap, the solid-liquid miscibility gap and the vitrification boundary in the isothermal phase diagrams at 25°C were identified. The liquid-liquid miscibility gap for the systems with PLLA was located in the same composition range as the corresponding systems with PDLLA. For the systems containing PLLA solid-liquid demixing was thermodynamically preferred over liquid-liquid demixing. Attempts were made to correlate the experimental findings with predictions on the basis of the Flory-Huggins theory for ternary solutions using interaction parameters derived from independent experiments. Qualitative agreement was found between the theoretical predictions and the experimentally obtained liquid-liquid miscibility gap. No good agreement was found for the solid-liquid miscibility gap.
Item Type:	Article
Copyright:	© 1996 Wiley InterScience
Faculty:	Science and Technology (TNW)
Research Group:	Polymer Chemistry and BioMaterials (PBM)
Link to this item:	http://purl.utwente.nl/publications/71258
Official URL:	http://dx.doi.org/10.1002/(SICI)1099-0488(19961115)34:15<2553::AID-POLB3>3.0.CO;2-U
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