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Realization of Ultra-High Barrier to Water Vapor by 3D-Interconnection of Super-hydrophobic Graphene Layers in Polylactide Films

Abstract

Inferior water barrier performance has been always a main deficiency of polylactide (PLA) that is practically difficult to overcome due to the existence of plentiful hydrophilic ester bonds in main chain. Here, we proposed an architecture of superhydrophobic 3D-networks in PLA, where interconnected graphene oxide grafted octadecylamine (GOgODA) nanosheets were able to effectively suppress dissolution and diffusion of water molecules into PLA matrix. Prior to the employment of the special technology “decoration of building block for vapor barrier – post-molding assembly”, uniform-sized PLA microspheres and superhydrophobic GOgODA were simultaneously prepared. Perfect GOgODA networks were successfully realized within transparent nanocomposite PLA films and obvious enhancement on water barrier was prominently achieved. Specifically, a remarkable decrease of almost 6.5 times in water permeability coefficient was observed for the nanocomposite films containing very small volume of GOgODA (0.268 vol %) (1.43 10-14 g cm cm-2 s-1 Pa-1) compared with pure PLA films (9.28 10-14 g cm cm-2 s-1 Pa-1). This prominent amelioration was derived from the ordered dispersion of well-extended GOgODA nanosheets, which concentrate selectively among the interface of PLA regions and arrange exactly perpendicular to the permeating pathway of water molecules. This methodology provides a facile and effective way to advance the functions and properties of PLA.

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Publication details

The article was received on 05 May 2017, accepted on 13 Jun 2017 and first published on 13 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA03901H
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Realization of Ultra-High Barrier to Water Vapor by 3D-Interconnection of Super-hydrophobic Graphene Layers in Polylactide Films

    S. Zhou, B. Yang, Y. Li, X. Gao, X. Ji, G. Zhong and Z. Li, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03901H

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