Fabrication of organo-modified carbon nanotube with excellent heat resistance and preparation of its polymer-based nanocomposite by simple melt compounding

Study on the improvement of dispersibility and orientation control of fluorocarbon‐modified single‐walled carbon nanotubes in a fluorinated polymer matrix

“…[42] A toluene solution of 1H, 2H, 2H-perfluoro-n-decylphosphonic acid (FDPA, Figure 2(B), left illustration) as a surface modifier was added to an aqueous dispersion medium containing the hydrophilic SWCNTs terminated with hydroxyl groups. The onset temperature of sublimation of FDPA is 213 C, which is extremely high for a material with a low-molecular weight (Figure 2 In previous studies, [39,40] the surface modification of SWCNTs via FDPA occurred at the oil/water interface. A toluene solution containing FDPA was added to a mixed aqueous dispersion medium containing hydrophilic SWCNTs terminated with hydroxyl groups and methanol (Figure 2(D)).…”

“…Although nanocomposite preparation was accomplished in this study, the achievement of an "improvement in the particle dispersion state in the matrix," leading to the effective improvement of the physical properties of the nanocomposite, is challenging. [39] Therefore, in this study, we attempt to add a fluorocarbon-based third component, responsible for improving dispersibility, during the nanocomposite preparation of fluoropolymer and fluorocarbon-modified SWCNTs (Figure 1, lower part). In a previous report, [40] fluorinated long-chain phosphonic acid was used in the chemical surface modification of SWCNTs.…”

“…Although nanocomposite preparation was accomplished in this study, the achievement of an “improvement in the particle dispersion state in the matrix,” leading to the effective improvement of the physical properties of the nanocomposite, is challenging. [ 39 ]…”

“…In general, it is difficult to prepare a composite by introducing highly water-repellent SWCNTs to a fluorocarbon-based polymer, such as PVDF, with a high-phase-separation tendency. Modifying the surface of SWCNTs with a fluorocarbon is a useful method for composite preparation because it improves miscibility with the PVDF polymer matrix [39]. In addition, the bonding of the fluorocarbon to the SWCNT surface via phosphonic acid bidentate bonds rises the desorption temperature to nearly 400 C, thus composite adjustment via a simple and effective meltcompounding method becomes possible [40].…”

Activity Maintenance Characteristics and Protease Adsorption on Langmuir Monolayer of Organo‐Modified Single‐Walled Carbon Nanotubes

“…So far, studies have been conducted on SWCNT Langmuir monolayers modified by long-chain fatty acids [25] and non-desorbable longchain phosphonic acids. [26] Organo-modified SWCNTs can be dispersed not only in organic solvents but also in organic polymers, [27] and orientation control using this technique [28] has been studied. Biomolecule adsorption/immobilization technology, [29] which utilizes the air/water interface, has the potential to control adsorption density by adjusting surface pressure.…”