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Highly Efficient Three-Dimensional Gas Barrier Network for Biodegradable Nanocomposite Films at Extremely Low Loading Levels of Graphene Oxide Nanosheets
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-18 , DOI: 10.1021/acs.iecr.9b06810
Ping-Ping Xu 1 , Shi-Min Zhang 1 , Hua-Dong Huang 1 , Ling Xu 1 , Gan-Ji Zhong 1 , Zhong-Ming Li 1
Affiliation  

A simple and facile method was proposed to successfully build a three-dimensional (3D) gas barrier network of graphene oxide nanosheets (GONSs) in the biodegradable poly(lactic acid) (PLA) matrix, in which GONSs were first self-assembled on the surface of PLA microspheres and then preferentially distributed at the interface of PLA domains. Polyethylene oxide was introduced as a flow accelerator and interfacial adhesive for favorable interfaces. As a result, the as-prepared PLA nanocomposite films exhibited a significant enhancement in barrier performance with ∼78.6% reduction in the O2 permeability coefficient at a low GONS loading of 0.0344 vol %. The modified Bharadwaj model by introducing an effective stacking factor indicated an efficient assembly of GONSs in the form of “edge-to-edge” stacking. The new insight into the relationship between the stacking efficiency of nanoplatelets and barrier performance provides a valuable clue in developing high-barrier polymer nanocomposite films.

中文翻译:

在极低的石墨烯氧化物纳米片负载水平下,可生物降解纳米复合薄膜的高效三维阻气网络

提出了一种简单易行的方法来成功地在可生物降解的聚乳酸(PLA)基质中建立氧化石墨烯纳米片(GONS)的三维(3D)气体阻隔网络,其中GONS首先在膜上自组装。 PLA微球表面,然后优先分布在PLA域的界面。引入聚环氧乙烷作为促进界面的流动促进剂和界面粘合剂。结果,所制备的PLA纳米复合材料薄膜的阻隔性能显着提高,O 2减少约78.6%在0.0344 vol%的低GONS加载量下的渗透系数。通过引入有效堆叠因子的改进的Bharadwaj模型表明,以“边对边”堆叠的形式有效组装了GONS。对纳米片的堆叠效率与阻隔性能之间关系的新见解为开发高阻隔聚合物纳米复合膜提供了有价值的线索。
更新日期:2020-03-19
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