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Heat-Resistant and Microwaveable Poly(Iactic acid) by Quantum-Dot Promoted Stereocomplexation
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.ORCID iD: 0000-0002-4468-5019
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2017 (English)In: ACS Sustainable Chemistry & Engineering, ISSN 2168-0485, Vol. 5, no 12, p. 11607-11617Article in journal (Refereed) Published
Abstract [en]

Nanofiller-tailored stereocomplexation signifies a promising and feasible pathway to develop heat-resistant poly (lactic acid) (PLA) materials. However, this pathway is thwarted by the potential adverse environmental issues of traditional nanofillers and the challenges in facilitating the nanofiller dispersion and selective formation of stereocomplex crystals (SCs). Here we unravel a microwave-assisted approach to exploit biobased quantum dots (QDs) featuring excellent capability to preferably nucleate PLA SCs. The combination of ultrasmall dimension and high oxygenation degree of QDs conferred intimate interactions with stereocomplexed PLA chains, readying complete exfoliation and uniform dispersion of QDs to promote stereocomplexation. The well-dispersed QDs provided perfect UV shielding for PLA composites, while sustaining high transmission to visible light comparable to pure PLA. Strong interfacial interactions and high concentration of SCs were created around the nanoscale surfaces of QDs, accounting for the greatly increased resistance to oxygen permeation, thermal deformation, and microwave heating. This was accompanied by substantial rise in tensile modulus and elongation at break (up to 74 and 51%) compared to that of pure PLA, affording the demonstration of unusual reinforcing and toughening mechanisms imparted by the PLA-affinitive QDs. The robust structural integrity under harsh usage environments, coupled with high gas barrier, prominent light management and evasion of flexibility and extensibility sacrifices, may prompt low-cost and ecofriendly PLA nanocomposites suitable for diverse applications including microwaveable food packaging.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2017. Vol. 5, no 12, p. 11607-11617
Keywords [en]
polylactide, stereocomplex, quantum dots, UV shielding, thermal resistance, microwaveable packaging
National Category
Chemical Sciences Polymer Technologies
Research subject
Fibre and Polymer Science
Identifiers
URN: urn:nbn:se:kth:diva-220463DOI: 10.1021/acssuschemeng.7b02963ISI: 000417341900053Scopus ID: 2-s2.0-85041963222OAI: oai:DiVA.org:kth-220463DiVA, id: diva2:1170363
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QC 20180103

Available from: 2018-01-03 Created: 2018-01-03 Last updated: 2018-06-21

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Xu, HuanHakkarainen, Minna

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