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2013, N2, pp. 84-93

S.E. Bogorodski, T.S. Zarkhina, E. V. Kuznetsov, S.A. Minaeva, V.K. Popov, A.B. Solovyeva, P.S. Timashev

Morphological changes of polylactic acid microstructure processed with supercritical carbon dioxide

Microstructure and properties of amorphous D,L-polylactide processed different routes in supercritical carbon dioxide (SC-CO2) are studied. Atomic force microscopy analysis demonstrated polymer plasticization that follows its swelling in SC-CO2 and leads to significant internal structure changes caused by polylactic acid supramolecular transformations. A developed pore structure formation and an accompanying increase of polylactide void volume are directly related to a destruction of initial intermolecular polymer bonds during the release of carbon dioxide. These changes are reflected in significant (1.75-fold) increase of exothermal effects detected by differential scanning calorimetry in the temperature ranges between -30 °C and -10 °C and around 3040 °C.

Key words: supercritical carbon dioxide, polylactide, atomic force microscopy of polymers


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