Ultrathin Nanosheets of Organic-Modified 尾-Ni(OH)2 with Excellent Thermal Stability: Fabrication and Its Reinforcement Application in Polymers

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• 作者：Saihua Jiang ; Zhou Gui ; Guohua Chen ; Dong Liang ; Jahangir Alam
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：July 15, 2015
• 年：2015
• 卷：7
• 期：27
• 页码：14603-14613
• 全文大小：682K
• ISSN：1944-8252

文摘

尾-Nickel hydroxide (尾-Ni(OH)₂), which combines two-dimensional (2D) structure and the catalytic property of nickel-containing compounds, has shown great potential for the application in polymer nanocomposites. However, conventional 尾-Ni(OH)₂ exhibits large thickness, poor thermal stability, and irreversible aggregation in polymer matrices, which limits its application. Here, we use a novel phosphorus-containing organosilane to modify the 尾-Ni(OH)₂ nanosheet, obtaining a new 尾-Ni(OH)₂ ultrathin nanosheet with excellent thermal stability. When compared to pristine 尾-Ni(OH)₂, the organic-modified 尾-Ni(OH)₂ (M-Ni(OH)₂) maintains nanosheet-like structure, and also presents a small thickness of around 4.6 nm and an increased maximum degradation temperature by 41 掳C. Owing to surface organic-modification, the interfacial property of M-Ni(OH)₂ nanosheets is enhanced, which results in the exfoliation and good distribution of the nanosheets in a PMMA matrix. The addition of M-Ni(OH)₂ significantly improves the mechanical performance, thermal stability, and flame retardancy of PMMA/M-Ni(OH)₂ nanocomposites, including increased storage modulus by 38.6%, onset thermal degradation temperature by 42 掳C, half thermal degradation temperature by 65 掳C, and decreased peak heat release rate (PHRR) by 25.3%. Moreover, it is found that M-Ni(OH)₂ alone can catalyze the formation of carbon nanotubes (CNTs) during the PMMA/M-Ni(OH)₂ nanocomposite combustion, which is a very helpful factor for the flame retardancy enhancement and has not been reported before. This work not only provides a new 2D ultrathin nanomaterial with good thermal stability for polymer nanocomposites, but also will trigger more scientific interest in the development and application of new types of 2D ultrathin nanomaterials.