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Reinforcing Epoxy Polymer Composites Through Covalent Integration of Functionalized Nanotubes

机译:通过功能化纳米管的共价结合增强环氧聚合物复合材料

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Strong interfacial bonding and homogenous dispersion have been found to be necessary conditions to take full advantage of the extraordinary properties of nanotubes for reinforcement of composites. We have developed a fully integrated nanotube composite material through the use of functionalized single-walled carbon nanotubes (SWNTs). The functionalization was performed via the reaction of terminal diamines with alkylcarboxyl groups attached to the SWNTs in the course of a dicarboxylic acid acyl peroxide treatment. Nanotube-reinforced epoxy polymer composites were prepared by dissolving the functionalized SWNTs in organic solvent followed by mixing with epoxy resin and curing agent. In this hybrid material system, nanotubes are covalently integrated into the epoxy matrix and become part of the crosslinked structure rather than just a separate component. Results demonstrated dramatic enhancement in the mechanical properties of an epoxy polymer material, for example, 30-70 % increase in ultimate strength and modulus with the addition of only small quantities (1-4 wt.-%) of functionalized SWNTs. The nanotube-reinforced epoxy composites also exhibited an increased strain to failure, which suggests higher toughness.
机译:已经发现强界面结合和均匀分散是充分利用纳米管的非凡性能增强复合材料的必要条件。我们已经通过使用功能化的单壁碳纳米管(SWNT)开发了完全集成的纳米管复合材料。通过在二羧酸酰基过氧化物处理过程中末端二胺与连接至SWNT的烷基羧基反应来进行官能化。通过将官能化的SWNTs溶解在有机溶剂中,然后与环氧树脂和固化剂混合,来制备纳米管增强的环氧聚合物复合材料。在这种混合材料系统中,纳米管共价整合到环氧基质中,成为交联结构的一部分,而不仅仅是单独的组分。结果表明,环氧聚合物材料的机械性能得到了显着提高,例如,仅添加了少量(1-4重量%)的官能化单壁碳纳米管,其最终强度和模量提高了30-70%。纳米管增强的环氧复合材料还显示出更大的破坏应变,这表明更高的韧性。

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