Polymeric surfactants with tricyclic rigidity from natural rosin: Synthesis and dispersion of single-walled carbon nanotubes in aqueous solution |
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| Authors: | Xinyan Yan Zhaolan Zhai Zhanqian Song Shibin Shang |
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| Affiliation: | 1. Institute of Chemical Industry of Forest Products, CAF;2. National Engineering Lab. for Biomass Chemical Utilization；Key and Open Lab. Of Forest Chemical Engineering, SFA;3. Key Lab. of Biomass Energy and Material, Nanjing, Jiangsu Province, China;4. Research Institute of Forestry New Technology, CAF, Beijing, China |
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| Abstract: | Polymeric surfactants from natural rosin containing a unique tricyclic rigid structure were prepared and their structures were characterized by IR, 1H NMR and GPC. Their surface activities including hydrophile—lipophile balance values (HLB), emulsification properties, foaming properties, critical micelle concentration (CMC) and the minimum surface tension (γCMC) were evaluated. With the increase in ratio of hydrophobic to hydrophilic in polymeric surfactant, the CMC values of the surfactants decreased, and the emulsification and foaming properties of these surfactants increased, and the HLB values of them decreased. This type of polymeric surfactants was used to disperse single-walled carbon nanotubes (SWCNTs) in water, and their dispersal capacities were comparatively determined by UV-visible absorption spectroscopy. Thermogravimetric analysis (TGA) was used to quantify the amount of surfactant attached onto the nanotubes. More intuitive image of their dispersion states were obtained by transmission electron microscopy (TEM) and atomic force microscopy (AFM). The results showed that this type of polymeric surfactants had good dispersion capacity and dispersion stability to SWCNTs in water through strong hydrophobic attraction and weak van der Waals interactions. |
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| Keywords: | Polymeric surfactant rigid dispersion carbon nanotubes hydrophobic attraction |
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