Foaming biodegradable polymers: effect of dissolved carbon dioxide on crystallization of poly(lactic acid) as probed by ultrasonic measurements

Alternative titleUltrasonic Characterisation and Sensors: PLA Crystallization
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Proceedings titleProceedings. Blowing Agents and Foaming Processes 2007
ConferenceThe 9th International Conference: Blowing Agents and Foaming Processes 2007, Frankfurt, Germany, May 22-23, 2007
Pages110; # of pages: 10
AbstractWhile low-density foam extrusion of amorphous poly(lactic acid) (PLA) has been performed with success, foaming its semi-crystalline counterpart still remains problematic. Blowing agents such as carbon dioxide affect the crystallization kinetics of PLA which has a strong impact on the processing window. The effect of dissolved CO2 molecules on the crystallization kinetics of PLA, as well as the decrease of the glass transition temperature, were investigated using an original device that combines ultrasonic and volumetric measurements. Contrarily to high-pressure DSC measurements, applied pressure and CO2 concentration can be studied independently with this device. Ultrasonic parameters such as sound velocity are very sensitive to crystallization and were thus used to monitor the crystallization kinetics. The crystallization rate was found to tremendously increase with a moderate addition of CO2 and the results are compared with classical DSC measurements. Impact on foam processing is also finally addressed.
Publication date
PublisherRapra Conference Proceedings
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedNo
NRC number53790
NPARC number15966865
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Record identifierf73c4889-3fb4-4518-9217-8c69fa6db64c
Record created2010-10-05
Record modified2016-05-09
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