Mittal Garima, Rhee Kyong Yop, Park Soo Jin
Department of Mechanical Engineering, College of Engineering, Kyung Hee University, Yongin 446-701, Korea.
Department of Chemistry, Inha University, Incheon 402-751, Korea.
Polymers (Basel). 2016 Apr 26;8(5):169. doi: 10.3390/polym8050169.
In this study, the cryomilling of carbon nanotubes (CNTs) was carried out to accomplish better dispersion without using any hazardous chemicals. Accordingly, different samples of CNTs were prepared by varying the milling speed (10, 20, and 25 Hz) and time (5, 10, and 15 min) and incorporated into the poly(methyl methacrylate) (PMMA) matrix. The changes of the morphology were analyzed by utilizing a field emission scanning electron microscope (FESEM) and a high-resolution transmission electron microscope (TEM). Qualitative analysis of the cryomilled CNTs was carried out using Raman spectroscopy, and their surface area was determined via Brunauer⁻Emmett⁻Teller (BET) analysis. Subsequently, thermogravimetric analysis was conducted to evaluate the thermal properties, whereas the surface resistivity and electromagnetic interference shielding effectiveness for the electrical conductivity were also examined. It was observed that the composite with Cr-20-10 showed better thermal stability and lower resistivity in comparison to the others because, as the cryomilling time and frequency increased the distribution, dispersion and surface area also increased. Consequently, a better interaction between CNTs and PMMA took place.
在本研究中，对碳纳米管（CNT）进行了低温研磨，以在不使用任何有害化学物质的情况下实现更好的分散。因此，通过改变研磨速度（10、20和25 Hz）和时间（5、10和15分钟）制备了不同的碳纳米管样品，并将其掺入聚甲基丙烯酸甲酯（PMMA）基体中。利用场发射扫描电子显微镜（FESEM）和高分辨率透射电子显微镜（TEM）分析了形态变化。使用拉曼光谱对低温研磨的碳纳米管进行了定性分析，并通过布鲁诺尔-埃米特-特勒（BET）分析测定了它们的表面积。随后，进行了热重分析以评估热性能，同时还研究了表面电阻率和电导率的电磁干扰屏蔽效能。观察到，与其他样品相比，Cr-20-10复合材料具有更好的热稳定性和更低的电阻率，这是因为随着低温研磨时间和频率的增加，分布、分散性和表面积也增加。因此，碳纳米管与PMMA之间发生了更好的相互作用。
