Effects of interface interaction and microphase dispersion on the mechanical properties of PCL/PLA/MMT nanocomposites visualized by nanomechanical mapping
Effects of interface interaction and microphase dispersion on the mechanical properties of PCL/PLA/MMT nanocomposites visualized by nanomechanical mapping
复制标题
通过纳米力学绘图可视化界面相互作用和微相分散对 PCL/PLA/MMT 纳米复合材料机械性能的影响
DOI：
10.1016/j.compscitech.2020.108048
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发表时间：
2020-04-12
影响因子：
9.1
通讯作者：
Shen, Changyu
中科院分区：
文献类型：
--
作者：
Zhu, Bo;Wang, Yaming;Shen, Changyu
微相分散和界面相互作用是高性能聚合物纳米复合材料的关键。然而，定量评估其影响仍然是一个挑战。本文以聚己内酯（PCL）/聚乳酸（PLA）/蒙脱土（MMT）纳米复合材料为模型，研究了MMT对复合材料微相分散和界面相互作用的影响，并与PCL/PLA共混物进行了比较。利用基于原子力显微镜（AFM）的纳米力学映射，观察了拉伸条件下的界面相互作用和微相演化。杨氏模量图显示了显着增加的界面宽度为91.0 +/- 15.3 nm的PCL/PLA/MMT纳米复合材料相比，PCL/PLA共混物的28.7 - 4.2 nm。此外，PCL/PLA/MMT纳米复合材料在拉伸下的形态演变和微观力学性能的变化进行了可视化，并与PCL/PLA共混物进行了比较。研究结果为理解三元纳米复合材料复杂的增韧机理提供了新的思路。
Microphase dispersions and interface interactions are crucial for high performance polymer nanocomposites. However, it remains a challenge to evaluate their effects quantitatively. In this work, poly(epsilon-caprolactone) (PCL)/poly(lactic acid) (PLA)/montmorillonite (MMT) nanocomposites were chosen as the model nanocomposites, and the effect of MMT on the microphase dispersions and interface interactions were studied and compared with PCL/PLA blends. Using the atomic force microscope (AFM) based nanomechanical mapping, the interface interactions and microphase evolution under tensile were visualized. The Young's moduli map shows a significantly increased interface width of 91.0 +/- 15.3 nm for PCL/PLA/MMT nanocomposites compared with 28.7 4.2 nm for PCL/PLA blends. Moreover, the morphology evolution and the onsite changes of microscopic mechanical properties for PCL/PLA/MMT nanocomposites under tensile were visualized and compared with PCL/PLA blends. The results can therefore provide more insights into understanding the complicated toughening mechanism of ternary nanocomposites.