A Novel Route for Polystyrene Grafted Single‐Walled Carbon Nanotubes and their Characterization

Nayak, Rati Ranjan; Shanmugharaj, A.M.; Ryu, Soo Hyung

doi:10.1002/macp.200700582

Cited by 16 publications

(9 citation statements)

References 50 publications

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“…FTIR spectrum of FSWNT-PS shows significantly reduced C−F peak and exhibits characteristic peaks of styrene at 760 and 3030 cm −1 , which correspond to the styrene ring vibration and C−H stretching of the aromatic ring, respectively (Figure S6). 28 1 H nuclear magnetic resonance (NMR) spectrum provided further evidence: peaks at δ = 6.4−7.2 ppm and δ = 0.8−2.1 ppm correspond to the phenyl proton and C−H groups of the polystyrene backbone, respectively (Figure S7). The thermogravimetric analysis (TG) showed that the overall weight loss of FSWNT-PS sample is ∼20% more than that of defluorinated FSWNTs, which was ascribed to the decomposition of PS chain on the sidewall of nanotubes (Figure S8).…”

Section: Nano Lettersmentioning

confidence: 99%

Direct Intertube Cross-Linking of Carbon Nanotubes at Room Temperature

Gao

Chen

et al. 2016

Nano Lett.

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Carbon nanotubes (CNTs) have long been regarded as an efficient free radical scavenger because of the large-conjugation system in their electronic structures. Hence, despite abundant reports on CNT reacting with incoming free radical species, current research has not seen CNT itself displaying the chemical reactivity of free radicals. Here we show that reactive free radicals can in fact be generated on carbon nanotubes via reductive defluorination of highly fluorinated single-walled carbon nanotubes (FSWNTs). This finding not only enriches the current understanding of carbon nanotube chemical reactivity but also opens up new opportunities in CNT-based material design. For example, spacer-free direct intertube cross-linking of carbon nanotubes was previously achieved only under extremely high temperature and pressure or electron/ion beam irradiation. With the free radicals on defluorinated FSWNTs, the nanotubes containing multiple radicals on the sidewall can directly cross-link with each other under ambient temperature through intertube radical recombination. It is demonstrated that carbon nanotube fibers reinforced via direct cross-linking displays much improved mechanical properties.

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Section: Nano Lettersmentioning

confidence: 99%

Direct Intertube Cross-Linking of Carbon Nanotubes at Room Temperature

Gao

Chen

et al. 2016

Nano Lett.

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“…2 In particular, a variety of living free radical polymerisation methodologies have been applied since carboxyl-modified carbon nanotubes can be easily functionalised with groups (e.g. polymerisable groups; 3 initiating alkyl halides; 4 chain transfer agents 5,6 ), which enable polymer chains to be grafted from their surfaces. Free radical polymerisation in the presence of RAFT agents has been used to produce polymers with narrow polydispersities.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of multiwalled carbon nanotube (MWCNT)/polymer nanostructured materials

et al. 2008

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, "Preparation and characterization of multiwalled carbon nanotube (MWCNT)/polymer nanostructured materials". Proceedings of SPIE, 7267, 72670G-1-72670G-11 (2008).Copyright 2008 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. Preparation and characterisation of multiwalled carbon nanotube (MWCNT)/polymer nanostructured materialsKristina T. Constantopoulos, * Cameron J. Shearer, Joseph G. Shapter, Nicolas H. Voelcker, Amanda V. Ellis School of Chemistry, Physics and Earth Sciences, Flinders University, GPO Box 2100, Bedford Park, South Australia, 5042, Australia. ABSTRACTHere, we report on a novel method of incorporating carbon nanotubes into a polymer matrix by using carbon nanotubes as a chain transfer agent (CTA) in Reversible Addition-Fragmentation chain Transfer (RAFT) polymerisations. The dithioester RAFT agents were covalently linked to multi-walled carbon nanotubes (MWCNTs) via a method, which involved the reaction of acyl halide MWCNTs with a magnesium chloride dithiopropanoate salt. Polystyrene (PSt) was subsequently grafted from the MWCNT surface via the core-first technique, which implies an outward growth of polymer chains from the core, using the R-group approach. The structure and morphology of the hybrid nanomaterials were investigated using FTIR, NMR, thrmogravimetric analysis (TGA) and atomic force microscopy (AFM) techniques. The results showed that the MWCNT chain transfer agent could be successfully used to mediate the growth of polystyrene polymer from the MWCNT surface via the living radical polymerisation approach.

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“…21 Some researchers studied the surface coating of CNTs to improve the dielectric constant of the prepared composite samples. [22][23][24][25][26][27][28] Zhang et al prepared unique cyanate ester composites with high dielectric constant based on multifunctional CNTs coated with phosphaphenanthrene terminated hyperbranched polysiloxane. Qiang et al 29 prepared new high dielectric constant composites based on unique multibranched polyaniline and CNT hybrids, in which the multibranched structure, large polyaniline concentration and flexible Si-O chains make the multibranched polyaniline coated on surfaces of CNTs through -interaction and the CNT hybrids have good dispersion in epoxy matrix.…”

Section: Introductionmentioning

confidence: 99%

Study of low weight percentage filler on dielectric properties of MCWNT-epoxy nanocomposites

Trihotri

Dwivedi²,

Malik

et al. 2016

J. Adv. Dielect.

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An attempt is made to study the effect of low weight percentage multiwall carbon nanotube (MWCNT) powder on dielectric properties of MWCNT reinforced epoxy composites. For that MWCNT (of different low weight percentage) reinforced epoxy composite was prepared by dispersing the MWCNT in resin. Samples were prepared by solution casting process and characterized for their dielectric properties such as dielectric constant (" 0 ), dielectric dissipation factor (tan ) and AC conductivity ( ac ). The main objective is the investigation of the dielectric properties of the prepared samples at the low weight percentage of the filler at different temperatures and frequencies. From the two mechanisms of electrical conduction, first the leakage current obtained by the formation of a percolation network in the matrix and the other by tunneling of electrons formed among conductors nearby (tunneling current); here we are getting conduction by the second mechanism. Generally, leakage current makes more contribution to conductivity than tunneling current. Dielectric dissipation factor at 250 Hz frequency is greater than all other frequencies and starts increasing from 60 C. The peak height of the transition temperature decreases with increasing frequency. This study shows that the addition of a low weight percentage of MWCNT can modify considerably the electrical behavior of epoxy nanocomposites without chemical functionalization of filler.

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A Novel Route for Polystyrene Grafted Single‐Walled Carbon Nanotubes and their Characterization

Cited by 16 publications

References 50 publications

Direct Intertube Cross-Linking of Carbon Nanotubes at Room Temperature

Direct Intertube Cross-Linking of Carbon Nanotubes at Room Temperature

Preparation and characterization of multiwalled carbon nanotube (MWCNT)/polymer nanostructured materials

Study of low weight percentage filler on dielectric properties of MCWNT-epoxy nanocomposites

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