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Zero-Dimensional and Highly Oxygenated Graphene Oxide for Multifunctional Poly(lactic acid) Bionanocomposites
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.ORCID iD: 0000-0002-5444-7276
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2016 (English)In: ACS Sustainable Chemistry & Engineering, ISSN 2168-0485, Vol. 4, no 10, p. 5618-5631Article in journal (Refereed) Published
Abstract [en]

The unique strengths of 2D graphene oxide nanosheets (GONSs) in polymer composites are thwarted by nanosheet agglomeration due to strong intersheet attractions. Here, we reveal that shrinking the planar size to 0D graphene oxide quantum dots (GOQDs), together with the intercalation of rich oxygen functional groups, reduces filler aggregation and enhances interfacial interactions with the host polymer. With poly(lactic acid) (PLA) as a model matrix, atomic force microscopy colloidal probe measurements illustrated that a triple increase in adhesion force to PLA was achieved for GOQDs (234.8 nN) compared to GONSs (80.4 nN), accounting for the excellent exfoliation and dispersion of GOQDs in PLA, in contrast to the notable agglomeration of GONSs. Although present at trace amount (0.05 wt %), GOQDs made a significant contribution to nucleation activity, mechanical strength and ductility, and gas barrier properties of PLA, which contrasted the inferior efficacy of GONSs, accompanied by clear distinction in film transparency (91% and 50%, respectively). Moreover, the GOQDs with higher hydrophilicity accelerated the degradation of PLA by enhancing water erosion, while the GONSs with large sheet surfaces gave a higher hydrolytic resistance. Our findings provide conceptual insights into the importance of the dimensionality and surface chemistry of GO nanostructures in the promising field of bionanocomposites integrating high strength and multifunction (e.g., enhanced transparency, degradation and gas barrier).

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2016. Vol. 4, no 10, p. 5618-5631
Keywords [en]
Graphene oxide, Surface functionalization, Biobased, Nanocomposite, Multifunctional, Degradation
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-195262DOI: 10.1021/acssuschemeng.6b01524ISI: 000384791500055Scopus ID: 2-s2.0-84989903716OAI: oai:DiVA.org:kth-195262DiVA, id: diva2:1046786
Funder
Swedish Research Council, 2014-4091
Note

QC 20161115

Available from: 2016-11-15 Created: 2016-11-02 Last updated: 2018-03-19Bibliographically approved

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Pettersson, TorbjörnHakkarainen, Minna

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