Abstract
Carbon nanotubes (CNTs) have been widely exploited to be used in many fields due to its perfect mechanical properties, but CNT agglomerates severely prevent CNTs’ excellent properties from performing. Many dispersants were synthesized to resolve the difficulty reported in recent years. In this paper, a healthier and cheaper dispersant with phenolic resin as original reagent was synthesized (denoted as AEP-4). Fourier transform infrared spectroscopy, nuclear magnetic resonance, and mass spectra were carried out to characterize chemical structure of reagent and products. Ultraviolet–visible spectroscopy and transmission electron microscopy were employed to evaluate the dispersibility of multi-walled carbon nanotubes (MWCNTs) in aqueous solution. The results showed that AEP-4 containing tertiary ammonium cations exhibited strong ability to disperse MWCNTs in aqueous solution, which showed better dispersion ability than sodium dodecyl benzene sulfonate. The scanning electron microscope results of MWCNT/carbon fiber reinforcements showed that many single MWCNTs showed up and uniformly covered carbon fiber surface in the case of carbon fiber treated by MWCNT/AEP-4 suspension, which reflected that MWCNT suspension with AEP-4 had good dispersion.
ᅟPhenolic resin was chemically modified to prepare dispersant with tertiary ammonium cations (APE-4) for carbon nanotube (CNT) aqueous suspension. APE-4 showed almost the largest ε of MWCNT, 55.6 cm2 mg−1, measured in optimized CNT/AEP-4 suspension using ultraviolet–visible spectroscopy, among those that have been reported up to now. The dispersant AEP-4 showed better dispersion ability in dispersing CNTs in aqueous solution than sodium dodecyl benzenesulfonate (SDBS), and the mechanism was unclosed.
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Funding
This study received financial supports from Equipment Development Fund in The Field of Key Projects (Grant No. 6140922010103), Natural Science Foundation of Zhejiang Province (Grant No. LY18E080037), and Ningbo Science and Technology Bureau (Project 2017A610047).
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Li, Y., Wei, H., Li, L. et al. High-efficiency surfactant prepared from phenolic resin for multi-walled carbon nanotube aqueous suspension. J Nanopart Res 20, 162 (2018). https://doi.org/10.1007/s11051-018-4264-9
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DOI: https://doi.org/10.1007/s11051-018-4264-9