Effects of surface modification with 3-aminopropyltriethoxysilane on structure and mechanical property of multiwalled carbon nanotube/polycarbonate composites

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• 作者：Yuanxu Zhao ; Bo Wang ; Weiwei Chen ; An Li ; Guoqiang Zheng ; Chuntai Liu ; Jingbo Chen and Changyu Shen
• 刊名：Polymer Composites
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：37
• 期：6
• 页码：1914-1923
• 全文大小：1201K
• ISSN：1548-0569

文摘

Hydroxyl functionalized multiwalled carbon nanotubes (H-MWNTs) were silanized using 3-aminopropyltriethoxysilane (APTES) in order to improve the dispersion and interfacial interaction in composites. MWNT/polycarbonate (PC) composites filled with H-MWNTs and silanized MWNTs (S-MWNTs) were fabricated by melt mixing and injection molding. Fourier transform infrared spectrometry (FTIR) and energy dispersion X-ray spectroscopy (EDS) were employed to prove the presence of APTES on the surface of S-MWNTs. In addition, thermogravimetric analysis (TGA) was used to evaluate the relative amount of introduced APTES. The microstructure and mechanical property of both composites were investigated by scanning electron microscopy (SEM), transmission electron microscope (TEM), tensile test and dynamic mechanical analysis (DMA). The SEM and TEM images showed that S-MWNT/PC composites had better dispersion and interfacial adhesion than H-MWNT/PC composites. A reinforcing and toughening effect on tensile behavior of composites was obtained after silane functionalization. The storage modulus of composites increased markedly as a function of MWNTs content, especially for the composites with S-MWNTs. In summary, the silanization can improve the dispersion of MWNTs and the interfacial adhesion between MWNTs and PC so as to enhance the mechanical properties of composites. POLYM. COMPOS., 37:1914–1923, 2016.