Extrusion Foaming of Semi-Crystalline PLA and PLA/Thermoplastic Starch Blends

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DOIResolve DOI: http://doi.org/10.1002/mabi.200700080
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TypeArticle
Journal titleMacromolecular Bioscience
Volume7
Issue7
Pages907920; # of pages: 14
AbstractLow density open-cell foams were obtained from polylactic acid (PLA) and from blends of PLA with thermoplastic starch (TPS) using CO2 as a blowing agent. Two unexpected features were found. First, a 2D cavitation process in the fractured cell walls was unveiled. Elliptical cavities with dimensions in the 100–300 nm range were aligned perpendicular to large cell cracks clearly exhibiting 2D crazing prior to macroscopic cell rupture. Secondly, a significant crystallization rate increase associated with the CO2 foaming of PLA was discovered. While the PLA used in this study crystallized very slowly in isothermal crystallization, the PLA foams exhibited up to 15% crystallinity, providing evidence that CO2 plasticization and the biaxial stretching upon foam expansion provided conditions that could increase the crystallization rate by several orders of magnitude.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number53787
NPARC number15959409
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Record identifiere85ef412-0117-4e65-90cd-00052529eef7
Record created2010-10-05
Record modified2016-05-09
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