Ma Ruixue, Zhu Bo, Zeng Qianqian, Wang Pan, Wang Yaming, Liu Chuntai, Shen Changyu
Key Laboratory of Materials Processing and Mold, Ministry of Education, National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China.
Materials (Basel). 2019 Feb 10;12(3):525. doi: 10.3390/ma12030525.
The agglomeration problem of nanofillers, for instance, carbon nanotubes (CNTs) in a poly(ether ether ketone) (PEEK) matrix, is still a challenging assignment due to the intrinsic inert nature of PEEK to organic solvents. In this work, organically modified montmorillonite (MMT) was introduced as a second filler for improving the dispersion of CNTs in the PEEK matrix and enhancing the mechanical properties, as well as reducing the cost of the materials. The nanocomposites were fabricated through melt-mixing PEEK with CNTs/MMT hybrids, which were prepared in advance by mixing CNTs with MMT in water. The introduction of MMT improved the dispersion stability of CNTs, as characterized by sedimentation and zeta potential. The CNTs/MMT hybrids were maintained in PEEK nanocomposites as demonstrated by the transmission electron microscope. The mechanical and thermomechanical measurements revealed that CNTs together with MMT had a strong reinforcement effect on the PEEK matrix, especially at high temperature, although it had a negative effect on the toughness. A maximum increase of 48.1% was achieved in storage modulus of PEEK nanocomposites with 0.5 wt% CNTs and 2 wt% MMT at 240 °C, compared to that of neat PEEK. The differential scanning calorimetry results revealed that CNTs accelerated the crystallization of the PEEK matrix while a further addition of MMT played an opposite role. The nucleation activity of the fillers was also evaluated by the Dobreva method.
例如，纳米填料在聚醚醚酮（PEEK）基体中的团聚问题，如碳纳米管（CNTs），由于PEEK对有机溶剂的固有惰性，仍然是一项具有挑战性的任务。在这项工作中，引入有机改性蒙脱土（MMT）作为第二种填料，以改善碳纳米管在PEEK基体中的分散性，增强机械性能，并降低材料成本。通过将PEEK与预先在水中将碳纳米管与蒙脱土混合制备的碳纳米管/蒙脱土杂化物进行熔融混合来制备纳米复合材料。通过沉降和zeta电位表征，蒙脱土的引入改善了碳纳米管的分散稳定性。如透射电子显微镜所示，碳纳米管/蒙脱土杂化物保留在PEEK纳米复合材料中。力学和热机械测量表明，碳纳米管与蒙脱土一起对PEEK基体具有很强的增强作用，尤其是在高温下，尽管对韧性有负面影响。与纯PEEK相比，在240℃下，含有0.5 wt%碳纳米管和2 wt%蒙脱土的PEEK纳米复合材料的储能模量最大增加了48.1%。差示扫描量热法结果表明，碳纳米管加速了PEEK基体的结晶，而进一步添加蒙脱土则起到相反的作用。还通过多布雷瓦方法评估了填料的成核活性。
