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Thermal behaviour of poly(lactic acid) in contact with compressed carbon dioxide

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BACKGROUND: The thermal behaviour of poly(lactic acid) (PLA) in contact with compressed CO2 was studied using high‐pressure differential scanning calorimetry. In particular, the effect of annealing below and above the glass transition temperature (T g) on the glass transition, cold crystallization and melting temperatures was studied systematically as a function of annealing time and pressure.

RESULTS: The effect of compressed CO2 on the thermal properties of PLA is time dependent. Annealing below T g decreases the temperature and enthalpy of cold crystallization. Similar, but more evident, behaviours are observed when annealing above T g. Crystallization temperature and enthalpy during cooling decrease with increasing pressure, and the peak is narrower.

CONCLUSION: Annealing PLA in the presence of compressed CO2 accelerates cold crystallization, but retards crystallization during cooling. Copyright © 2009 Society of Chemical Industry
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Keywords: PLA; annealing; carbon dioxide; pressure; thermal behaviour

Document Type: Research Article

Publication date: April 1, 2009

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