Abstract

Graphene oxide modified with long flexible hydrocarbon chains attracts increasing interest in toughing and stabilizing polymer nanocomposites. Herein, graphene oxide bearing with two types of long alkyl chains, namely 2-octyldodecylamine (swallow tail) and dodecylamine (linear), were prepared and introduced into polylactide by a master batch melt blending process. Swallow-tailed graphene oxide sheets show a homogeneous and stable dispersion in organic solvents, suggesting that the bulky groups enable to weaken Van der Waals forces, which is in consistence with the increment of 4.4 Å in interlayer spacings. Moreover, 2-octyldodecylamine-functionalized graphene oxide sheets allow polyactide to be highly toughness without sacrificing tensile strength. In comparison to neat polylactide, the polylactide nanocomposites with 0.3 wt % 2-octyldodecylamine-functionalized graphene oxide display about 400% increase in the elongation at break. The crystallization properties of polylactide were also improved with nanofillers. In addition, the polylactide nanocomposites exhibit high thermal stability in the presence of 0.3 wt % swallow-tailed graphene oxide sheets. Therefore, this study provides a new concept to modify graphene oxide to elevate the dispersion of graphene oxide, which contributes to enhancing interfacial interaction and consequently endowing polymer nanocomposites with high toughness and high stability.

中文翻译：

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燕尾氧化石墨烯增强聚丙烯酸酯纳米复合材料的韧性

摘要

用长的柔性烃链改性的氧化石墨烯在增韧和稳定聚合物纳米复合材料方面引起了越来越多的兴趣。在此，制备具有2-长烷基十二烷基胺（燕尾）和十二烷基胺（线性）的两种长烷基链的氧化石墨烯，并通过母料熔融共混法引入到聚丙交酯中。燕尾氧化石墨烯片在有机溶剂中显示均匀且稳定的分散，这表明庞大的基团能够削弱范德华力，这与层间间距增加4.4一致。此外，通过2-辛基十二烷基胺官能化的氧化石墨烯片，可以在不牺牲拉伸强度的情况下使聚丙交酯具有高韧性。与纯聚丙交酯相比，聚丙交酯纳米复合材料为0。3重量％的2-辛基十二烷基胺官能化的氧化石墨烯的断裂伸长率显示出约400％的增加。纳米填料还改善了聚丙交酯的结晶性能。另外，聚丙交酯纳米复合材料在0.3重量％的燕尾氧化石墨烯片的存在下显示出高的热稳定性。因此，本研究提供了改性氧化石墨烯以提高氧化石墨烯分散性的新概念，这有助于增强界面相互作用并因此赋予聚合物纳米复合材料以高韧性和高稳定性。3重量％的燕尾氧化石墨烯片。因此，本研究提供了改性氧化石墨烯以提高氧化石墨烯分散性的新概念，这有助于增强界面相互作用并因此赋予聚合物纳米复合材料以高韧性和高稳定性。3重量％的燕尾氧化石墨烯片。因此，本研究提供了改性氧化石墨烯以提高氧化石墨烯分散性的新概念，这有助于增强界面相互作用并因此赋予聚合物纳米复合材料以高韧性和高稳定性。