Sahoo Nanda Gopal, Thet Naing Tun, Tan Qing Hao, Li Lin, Chan Siew Hwa, Zhao Jianhong, Yu Suzhu
School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
J Nanosci Nanotechnol. 2009 Oct;9(10):5910-9. doi: 10.1166/jnn.2009.1236.
The effect of multi-walled carbon nanotubes (MWCNTs) and processing methods on the morphological, crystalline, dynamic mechanical, mechanical and electrical properties of MWCNT/polypropylene (PP) composites has been investigated by using field emission scanning electron microscopy (SEM), differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), tensile and electric conductivity tests. The MWCNTs have been functionalized covalently and noncovalently for better dispersion in the PP matrix. A homogeneous dispersion of MWCNTs was achieved in the PP matrix as evidenced by scanning electron microscopy. Differential scanning calorimetric (DSC) results confirmed that the incorporation of the MWCNTs effectively enhanced the crystallization of the PP matrix through heterogeneous nucleation. The glass transition temperature increased from 8 degrees C for the pure PP to 26 degrees C for the composite with 10 wt% MWCNT-COOH. The present investigation revealed that the mechanical, thermal as well as electrical properties of carbon nanotubes filled polymer composites were strongly dependent on the state of dispersion, mixing and processing methods.
通过场发射扫描电子显微镜（SEM）、差示扫描量热法（DSC）、动态力学分析（DMA）、拉伸和电导率测试，研究了多壁碳纳米管（MWCNT）及其加工方法对MWCNT/聚丙烯（PP）复合材料的形态、结晶、动态力学、力学和电学性能的影响。为了在PP基体中更好地分散，MWCNT已通过共价和非共价方式进行了功能化处理。扫描电子显微镜证明，MWCNT在PP基体中实现了均匀分散。差示扫描量热（DSC）结果证实，MWCNT的加入通过异相成核有效地促进了PP基体的结晶。玻璃化转变温度从纯PP的8℃升高到含有10 wt% MWCNT-COOH的复合材料的26℃。本研究表明，碳纳米管填充聚合物复合材料的力学、热学以及电学性能强烈依赖于分散状态、混合和加工方法。
