Improved covalent functionalization of multi-walled carbon nanotubes using ascorbic acid for poly(amide–imide) composites having dopamine linkages

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• 作者：SHADPOUR MALLAKPOUR ; AMIN ZADEHNAZARI
• 关键词：Multi ; walled carbon nanotube ; ascorbic acid ; mechanical properties ; thermal stability ; transmission electron microscopy.
• 刊名：Bulletin of Materials Science
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：40
• 期：1
• 页码：213-222
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science, general; Engineering, general;
• 出版者：Indian Academy of Sciences
• ISSN：0973-7669
• 卷排序：40

文摘

Ascorbic acid has been covalently linked to multi-walled carbon nanotubes (MWCNTs). The structures of the functionalized MWCNTs were characterized with Fourier-transform infrared spectroscopy. Thermogravimetric analysis results also demonstrated the presence of organic portions of the functionalized MWCNTs. Polymer composites based on a nanostructured poly(amide–imide) (PAI) were fabricated by an ex situ technique with 5, 10 and 15% loading by weight. Composite films were made by the solvent casting method. The thermal stability of the composites increased with even a small amount of modified MWCNT added. Tensile tests were conducted and depicted an increase in the elastic modulus with increasing MWCNTs content. X-ray diffraction study of the composites also indicated that the composites incorporated MWCNTs in the polymer chain.