Strength and toughness are both of great importance for the application of polylactic acid (PLA). Unfortunately, these two properties are often contradictory. In this work, an effective and practical strategy is proposed by using carboxylated graphene oxide (GC) grafted with polyethylene glycol (PEG), i.e. GC-g-PEG. The synthesis procedure of GC-g-PEG is firstly optimized. Then, a series of PLA nanocomposites were prepared by the melt blending method via masterbatch. In comparison to that achieved over pure PLA, these nanocomposites are of higher crystallinity, thermal stability and mechanical strength. This is mainly attributed to well-tailored interface and good dispersion. Especially, while retaining the tensile strength of the original PLA, the elongation at break increases by seven times by adding 0.3 wt% GC-g-PEG.

强度和韧性对于聚乳酸（PLA）的应用非常重要。不幸的是，这两个属性常常是矛盾的。在这项工作中，提出了一种有效且实用的策略，即使用接枝聚乙二醇（PEG）的羧化氧化石墨烯（GC），即GC-g-PEG。首先优化了GC-g-PEG的合成工艺。然后，通过母粒熔融共混的方法制备了一系列PLA纳米复合材料。与纯 PLA 相比，这些纳米复合材料具有更高的结晶度、热稳定性和机械强度。这主要归功于精心设计的界面和良好的分散性。特别是，在保留原始PLA拉伸强度的同时，添加0.3 wt% GC-g-PEG后断裂伸长率提高了7倍。