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- W2034884329 abstract "Freeze-drying of polylactide solutions in 1,4-dioxane has been studied as a way to produce microcellular foams. The thermally induced phase separation has been studied in relation to several processing and formulation parameters. The effects of polymer concentration, chain stereoregularity, polymer molecular weight and cooling rate have been investigated in connection with the porous morphology and the physicomechanical characteristics of the final foams. As a rule, bundles of channels are formed with a diameter of ≈100 μm. They have a preferential orientation that fits the cooling direction. A porous substructure (≈10 μm) is observed in the internal walls of the tubular macropores. Variations in this general porous morphology—and particularly in the porosity, density, solvent residue, mechanical resistance and degree of regularity in the spatial organization of pores—have been observed when polymer concentration in 1,4-dioxane and polylactide stereoregularity are changed. As expected, cooling rate has a strong effect on the foam morphology, which is essentially controlled by the solvent crystallization. Pores are nothing but the fingerprints of 1,4-dioxane crystallites." @default.
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- W2034884329 date "1996-01-01" @default.
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- W2034884329 title "Biodegradable and macroporous polylactide implants for cell transplantation: 1. Preparation of macroporous polylactide supports by solid-liquid phase separation" @default.
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- W2034884329 doi "https://doi.org/10.1016/0032-3861(96)87287-9" @default.
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