Jee Ah-Young, Lee Minyung
Division of Chemistry and Nanoscience, Ewha Womans University, Seoul 120-750, Korea.
J Nanosci Nanotechnol. 2011 Jan;11(1):533-6. doi: 10.1166/jnn.2011.3290.
Polymer nanocomposites (PNCs) possess highly versatile characteristics, depending on the nanofiller properties such as its chemical composition, particle size, dimension, polydispersity, concentration, or surface functional groups. In comparison with micron-sized materials, the nanofiller having a large surface area facilitates stronger interaction with the matrix. In this work, various surface-functionalized nanodiamonds (sf-NDs) having hydroxyl, carboxyl, amino, and amide group were prepared, and dispersed into polycarbonate (PC) and poly(methyl methacrylate) (PMMA) polymers. The polymer nanocomposites (PNCs) which contain the ND content of 5 wt% were subjected to the measurements of mechanical properties such as hardness and Young's modulus by atomic force microscopy (AFM) nanoindentation. It was observed that the hardness and Young's modulus of the polymer nanocomposites depend on strongly the nature of functional groups. The amine or amide functionalization gives the high mechanical properties for both polymers. The interfacial interaction between sf-NDs and polymer matrices is an important factor determining the mechanical properties of the PNCs.
聚合物纳米复合材料（PNCs）具有高度多样的特性，这取决于纳米填料的性质，如化学成分、粒径、尺寸、多分散性、浓度或表面官能团。与微米级材料相比，具有大表面积的纳米填料有助于与基体形成更强的相互作用。在这项工作中，制备了具有羟基、羧基、氨基和酰胺基的各种表面功能化纳米金刚石（sf-NDs），并将其分散到聚碳酸酯（PC）和聚甲基丙烯酸甲酯（PMMA）聚合物中。通过原子力显微镜（AFM）纳米压痕对含5 wt% ND含量的聚合物纳米复合材料（PNCs）进行了硬度和杨氏模量等力学性能的测量。观察到聚合物纳米复合材料的硬度和杨氏模量强烈依赖于官能团的性质。胺或酰胺功能化赋予了两种聚合物较高的力学性能。sf-NDs与聚合物基体之间的界面相互作用是决定PNCs力学性能的一个重要因素。
