Rheology and extrusion foaming of chain-branched poly(lactic acid)

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DOIResolve DOI: http://doi.org/10.1002/pen.21561
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Journal titlePolymer Engineering and Science
Pages629642; # of pages: 15
AbstractIn this study, the effect of macromolecular chainbranching on poly(lactic acid) (PLA) rheology, crystallization, and extrusion foaming was investigated. Two PLA grades, an amorphous and a semi-crystalline one, were branched using a multifunctional styrene-acrylicepoxy copolymer. The branching of PLA and its foaming were achieved in one-step extrusion process. Carbon dioxide (CO2), in concentration up to 9%, was used as expansion agent to obtain foams from the two PLA branched using chain-extender contents up to 2%. The foams were investigated with respect to their shear and elongational behavior, crystallinity, morphology, and density. The addition of the chain-extender led to an increase in complex viscosity, elasticity, elongational viscosity, and in the manifestation of the strain-hardening phenomena. Low-density foams were obtained at 5–9% CO2 for semi-crystalline PLA and only at 9% CO2 in the case of the amorphous PLA. Differences in foaming behavior were attributed to crystallites formation during the foaming process. The rheological and structural changes associated with PLA chain-extension lowered the achieved crystallinity but slightly improved the foamability at low CO2 content.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number52509
NPARC number15657354
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Record identifier9d3f233b-a476-4342-aae9-3d736f0d02c1
Record created2010-06-10
Record modified2016-05-09
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