Role of thermal history on the thermal behavior of poly(<Emphasis Type="Italic">L</Emphasis>-lactic acid) studied by DSC and optical microscopy |
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Authors: | Y Wang J F Mano |
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Institution: | (1) 3B s Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, 4710-057 Braga, Portugal;(2) Polymer Engineering Department, University of Minho, Campus of Azurém, 4800-058 Guimar es, Portugal |
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Abstract: | Summary The thermal behavior of poly(L-lactic acid) (PLLA) was studied with differential scanning calorimetry (DSC) and polarized optical microscopy. For amorphous PLLA samples, double cold crystallisation peaks were observed in the DSC traces during heating process, being strongly dependent on heating rates. The observation was discussed based on the assumption that the quenched PLLA sample presented some remaining metastable or a precrystalline phase. A small exothermal peak was observed before the main melting peak at low heating rates. The probable reason was discussed through melt-recrystallisation mechanism. Influence of thermal history on the cold crystallisation and melting behavior was also performed on heating process for PLLA samples. |
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Keywords: | DSC thermal behavior optical microscopy poly(L-lactic acid) thermal history |
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