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Dispersions of surface-modified carbon nanotubes in water-soluble and water-insoluble polymers

机译：表面改性的碳纳米管在水溶性和非水溶性聚合物中的分散

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Microscale aggregate formation, resulting from high intrinsic filler attractions, is one of the major issues in nanocomposite preparation and processing. Herein, the dispersive effects achieved by a wide range of surface-active agents, as well as surface oxidation and functionalization, are investigated. The aim of our research is to form a uniform, multiwalled carbon nanotube (MWNT) distribution in water-soluble (poly(ethylene glycol)) and water-insoluble (polypropylene) polymers. In order to understand the surface-charge-related stability of the treated nanotubes solutions, zeta-potential measurements are applied. Quantification of the state of the MWNT dispersion is derived from particle-size analysis, while visual characterization is based on optical and electron microscopy. To estimate the nucleating ability of the surface-modified carbon nanotubes, the temperature of crystallization and the degree of crystallinity are calculated from differential scanning thermograms. Finally, we suggest general guidelines to produce uniform MWNT dispersions using a dispersive agent and/or surface treatment in water-soluble and water-insoluble polymers.
机译：由高固有的填料吸引力引起的微细聚集体形成是纳米复合材料制备和加工中的主要问题之一。在此，研究了通过各种表面活性剂实现的分散效果以及表面氧化和官能化。我们研究的目的是在水溶性（聚乙二醇）和水不溶性（聚丙烯）聚合物中形成均匀的多壁碳纳米管（MWNT）分布。为了了解经处理的纳米管溶液的表面电荷相关的稳定性，应用了ζ电势测量。 MWNT分散体状态的量化来自粒度分析，而视觉表征则基于光学和电子显微镜。为了估计表面改性的碳纳米管的成核能力，根据差示扫描热分析图计算了结晶温度和结晶度。最后，我们提出了使用分散剂和/或在水溶性和水不溶性聚合物中进行表面处理来生产均匀MWNT分散体的通用指南。

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