Extrusion foaming of poly(lactic acid) blown with CO₂ : Toward 100% green material

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TypeArticle
Journal titleCellular polymers
Volume26
Issue2
Pages83115; # of pages: 33
SubjectBiodegradable polymers; poly(lactic acid); foam extrusion; open-cell; plasticization
AbstractThis paper presents a thorough investigation of the continuous extrusion foaming of amorphous poly(lactic acid) (PLA) using carbon dioxide (CO₂) as the blowing agent. Detailed results describing the plasticization induced by CO₂ dissolution as measured from two different methods, on-line rheometry and in-line ultrasonic technique, are given. Characteristics of the foams obtained from extrusion performed under various processing conditinos are also reported. Extrusion of PLA foams in the 20-25 kg/m³ density range was achieved. However, the associated processing window was very narrow: CO₂ content lower than ca. 7 wt% did not lead to significant foam expansion while foams blown at CO₂ contents larger than 8.3 wt% showed severe shrinkage upon ageing.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number48933
NPARC number15769644
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Record identifierf3b6575d-a09e-46c1-8d2c-720b67224eed
Record created2010-07-06
Record modified2016-05-09
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