Recycling and rheology of poly(lactic acid) (PLA) to make foams using supercritical fluid

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dc.contributor.authorLin L
dc.contributor.authorLee Y
dc.contributor.authorPark, Heon Ewan
dc.date.accessioned2021-11-29T21:37:03Z
dc.date.available2021-11-29T21:37:03Z
dc.date.issued2021en
dc.date.updated2021-06-30T03:50:49Z
dc.description.abstractBiodegradable plastics are thought to be the possible directions in managing plastic pollutions. Unfortunately, they are not recycled in most countries since they are designed to decompose even though recycling is a more pragmatic method than landfill or incineration. Thus, it is more constructive to develop methods to recycle biodegradable plastics or to develop biodegradable yet recyclable plastics. In this study, we used cutlery with a composite of poly(lactic acid) (PLA) and talc. The possibility to recycle it to make foams was studied even though it will have lowered mechanical strength from the recycling process as it is less significant for this product. Tensile properties of solid PLA and foams showed no significant decrease in the strength up to three processes of compression molding and foaming. We performed shear rheometry to determine the thermal stability and dependences of the complex viscosity on frequency and temperature. The magnitude of the complex viscosity dramatically increased with decreasing frequency and such an upturn increased with temperature, but time-temperature superposition was valid at high temperatures. The extensional rheometry showed no strain hardening, but physical foaming using supercritical carbon dioxide (CO2) could still occur, and the operating conditions to obtain various foamed structures were determined. We also compared the effects of one-directional against three-dimensional expansion. Overall, the concentration of CO2 in PLA and crystallinity of the foams are the two key variables to describe the bulkiness of foams. Surprisingly, the lower the CO2 concentration, the bulkier the foams at any sorption temperature and pressure.en
dc.identifier.citationLin L, Lee Y, Park HE (2021). Recycling and rheology of poly(lactic acid) (PLA) to make foams using supercritical fluid. Physics of Fluids. 33(6). 067119-067119.en
dc.identifier.doihttp://doi.org/10.1063/5.0050649
dc.identifier.issn1070-6631
dc.identifier.issn1089-7666
dc.identifier.urihttps://hdl.handle.net/10092/103053
dc.languageen
dc.language.isoenen
dc.publisherAIP Publishingen
dc.rightsAll rights reserved unless otherwise stateden
dc.rights.urihttp://hdl.handle.net/10092/17651en
dc.subject.anzsrc01 Mathematical Sciencesen
dc.subject.anzsrc02 Physical Sciencesen
dc.subject.anzsrc09 Engineeringen
dc.subject.anzsrcFields of Research::40 - Engineering::4011 - Environmental engineering::401106 - Waste management, reduction, reuse and recyclingen
dc.subject.anzsrcFields of Research::40 - Engineering::4004 - Chemical engineering::400403 - Chemical engineering designen
dc.subject.anzsrcFields of Research::40 - Engineering::4016 - Materials engineering::401609 - Polymers and plasticsen
dc.subject.anzsrcFields of Research::34 - Chemical sciences::3403 - Macromolecular and materials chemistry::340305 - Physical properties of materialsen
dc.titleRecycling and rheology of poly(lactic acid) (PLA) to make foams using supercritical fluiden
dc.typeJournal Articleen
uc.collegeFaculty of Engineering
uc.departmentChemical and Process Engineering
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