Abstract Excellent dispersion of nanofillers like carbon nanotubes (CNTS) in an aqueous medium of rubber latex through covalent interactions is required to achieve extraordinary reinforcement at very low filler concentration. Herein, aqueous dispersible carbon dots (CDOTS) have been used as dispersion aid to debundle CNTS in carboxylated acrylonitrile butadiene rubber (XNBR) latex. The amine groups of CDOTS have been covalently conjugated with the acid groups of CNTS and XNBR latex through amide bond formation that leads to enhanced interactions between XNBR and CNTS through CDOTS. In addition, CDOTS weaken the strong intertubular van der Waals attraction between the CNTS which results in the efficient dispersion of high aspect ratio CNTS in the XNBR matrix and thereby significantly improves the overall properties. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) studies establish the success of covalent conjugation of CDOTS with CNTS and XNBR latex. The mechanical, dynamic mechanical, thermal stability and thermal conductivity properties of the XNBR-CDOTS-CNTS hybrid nanocomposites are prominently higher when compared to neat XNBR, XNBR-CNTS nanocomposites and XNBR-CDOTS nanocomposites. From transmission electron microscopy (TEM) and atomic force microscopy (AFM) studies it has been ascertained that the CDOTS act as an interconnector between CNTS that prevents agglomeration of CNTS in the XNBR matrix.

中文翻译：

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使用碳点在聚合物基质中分离碳纳米管以增强性能的独特方法

摘要 纳米填料（如碳纳米管 (CNTS)）通过共价相互作用在橡胶胶乳的水性介质中具有优异的分散性，以在非常低的填料浓度下实现非凡的增强效果。在本文中，水分散性碳点 (CDOTS) 已被用作分散助剂，以在羧化丙烯腈丁二烯橡胶 (XNBR) 胶乳中分散 CNTS。CDOTS 的胺基团已通过酰胺键形成与 CNTS 和 XNBR 胶乳的酸基团共价结合，从而通过 CDOTS 增强 XNBR 和 CNTS 之间的相互作用。此外，CDOTS减弱了CNTS之间的强管间范德华引力，导致高纵横比CNTS在XNBR基体中的有效分散，从而显着改善了整体性能。傅里叶变换红外光谱 (FTIR) 和 X 射线光电子能谱 (XPS) 研究确定了 CDOTS 与 CNTS 和 XNBR 胶乳共价共轭的成功。与纯 XNBR、XNBR-CNTS 纳米复合材料和 XNBR-CDOTS 纳米复合材料相比，XNBR-CDOTS-CNTS 混合纳米复合材料的机械、动态机械、热稳定性和热导率性能明显更高。从透射电子显微镜 (TEM) 和原子力显微镜 (AFM) 研究中，已经确定 CDOTS 充当 CNTS 之间的互连器，可防止 XNBR 基质中的 CNTS 团聚。与纯 XNBR、XNBR-CNTS 纳米复合材料和 XNBR-CDOTS 纳米复合材料相比，XNBR-CDOTS-CNTS 混合纳米复合材料的热稳定性和导热性显着更高。从透射电子显微镜 (TEM) 和原子力显微镜 (AFM) 研究中，已经确定 CDOTS 充当 CNTS 之间的互连器，可防止 XNBR 基质中的 CNTS 团聚。与纯 XNBR、XNBR-CNTS 纳米复合材料和 XNBR-CDOTS 纳米复合材料相比，XNBR-CDOTS-CNTS 混合纳米复合材料的热稳定性和导热性显着更高。从透射电子显微镜 (TEM) 和原子力显微镜 (AFM) 研究中，已经确定 CDOTS 充当 CNTS 之间的互连器，可防止 XNBR 基质中的 CNTS 团聚。