Zero-Dimensional and Highly Oxygenated Graphene Oxide for Multifunctional Poly(lactic acid) Bionanocomposites
2016 (English)In: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 4, no 10, 5618-5631 p.Article in journal (Refereed) Published
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, 5618-5631 p.
Biobased, Degradation, Graphene oxide, Multifunctional, Nanocomposite, Surface functionalization, Agglomeration, Atomic force microscopy, Filled polymers, Gas permeable membranes, Lactic acid, Nanocomposites, Nanosheets, Semiconductor quantum dots, Surface chemistry, Transparency, Bio-based, Graphene oxide nanosheets, Graphene oxides, Interfacial interaction, Oxygen functional groups, Strength and ductilities, Graphene
IdentifiersURN: urn:nbn:se:kth:diva-195262DOI: 10.1021/acssuschemeng.6b01524ISI: 000384791500055ScopusID: 2-s2.0-84989903716OAI: oai:DiVA.org:kth-195262DiVA: diva2:1046786
QC 201611152016-11-152016-11-022017-01-10Bibliographically approved