Enhancing the reinforcing efficiency in CNT nanocomposites via the development of pyrene-based active dispersants
| Autor: | Qiang Li, Xinyi Yin, Xi Zhou, Han Zhang, Haishui Wang, Wengang Yang, Weibang Lyu |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Nanocomposite
Materials science General Chemical Engineering Stacking 02 engineering and technology General Chemistry Epoxy Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Dispersant 0104 chemical sciences law.invention chemistry.chemical_compound Chemical engineering chemistry law visual_art Dispersion stability visual_art.visual_art_medium Pyrene 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | RSC Advances. 11:23892-23900 |
| ISSN: | 2046-2069 |
| Popis: | Various preforms of carbon nanotubes (CNTs), such as fibers, yarns, or buckypapers (BP), have been developed over the last few years in order to fabricate advanced nanocomposites containing a high volume fraction of the reinforcing phase. However, a homogeneous dispersion and an even isolation of CNTs during the fabrication process of many preforms such as BP is often challenging, while the poor interaction between CNTs and the matrix also limits the final performance of the nanocomposites. Herein, a new route to overcome these two challenges simultaneously has been demonstrated based on an active dispersant (noted as Py-PEI) developed through the quaternization reaction of pyrene derivatives (Py-Br) and polyethylenimine (PEI). The existence of pyrene groups leads to the formation of π–π stacking with CNTs, successfully hindering the re-aggregation of dispersed CNTs. Meanwhile, the amine groups of Py-PEI can establish covalent bonds with epoxy, leading to an enhanced load transfer efficiency between CNTs and epoxy in the composites. Systematic characterization of both fabricated BP and BP-reinforced nanocomposites have been performed, with significantly enhanced CNT dispersion stability in water together with improved mechanical performance of the as-obtained BP/epoxy nanocomposites. This study provides a new strategy in fabricating high performance nanocomposites with the ease of nanofiller dispersion and enhanced reinforcing efficiency. |
| Databáze: | OpenAIRE |
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