Functionalization of Single-Walled Carbon Nanotubes with Well-Defined Polymers by Radical Coupling

Liu, Yuanqin; Yao, Zhaoling; Adronov, Alex

doi:10.1021/ma048273s

Cited by 212 publications

(185 citation statements)

References 41 publications

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“…1450, 1700 and 1900 nm remain similar following both the ion exchange or p-p stacking processes, suggesting the one-dimensional p-conjugation electronic states of fluorescent SWNTs complexes are preserved. [14,31,[66][67][68][69] This observation contrasts with a previous report, in which pyrene-functionalized SWNTs were prepared via sidewall cycloaddition and the absorption peak of the first band gap disappeared completely, indicating a deterioration of the one-dimensional electronic states. [70] Additional evidence for the retention of the onedimensional electronic states of SWNTs comes from Raman spectra.…”

Section: Resultscontrasting

confidence: 88%

A Facile Strategy for Preparation of Fluorescent SWNT Complexes with High Quantum Yields Based on Ion Exchange

Fu¹,

Meng²,

Lu³

et al. 2008

Adv Funct Materials

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The fluorescent imidazolium salt (1,3‐bis(9‐anthracenylmethyl)imidazolium chloride, [bamim]Cl) has been grafted onto the surfaces of single‐walled carbon nanotubes (SWNTs) using an ion exchange strategy based on metathesis of the K+ ion in CO2K derivatized SWNTs with [bamim]+. The resulting SWNT‐[bamim] complex has been characterized with high‐resolution transmission electron microscopy (HR‐TEM), X‐ray photoelectron spectroscopy (XPS), elemental mapping, and elemental linear profiles analysis. A blue light emission can be observed at 392, 414 and 438 nm for SWNT‐[bamim] upon being excited at 254 nm. The quantum yield (QY) of the SWNT‐[bamim] complex (0.40) is much higher than that of SWNT/[bamim]Cl (0.02), used as a control, and prepared using a π‐π stacking method, indicating that ion exchange is a far more effective strategy for retaining a high QY. Additionally, UV‐Vis‐NIR and Raman spectroscopy show that the SWNT‐[bamim] complex can maintain the one‐dimensional electronic states of SWNTs. Other imidazolium salts have also been successfully grafted onto SWNTs via the same strategy, indicating that the ion exchange process can serve as a universal strategy for the functionalization of SWNTs.

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Section: Resultscontrasting

confidence: 88%

A Facile Strategy for Preparation of Fluorescent SWNT Complexes with High Quantum Yields Based on Ion Exchange

Fu¹,

Meng²,

Lu³

et al. 2008

Adv Funct Materials

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“…[36][37][38] It was first fabricated by the in situ polymerization process. Various research groups have reached the same results: that the initiator fragment is first attached to the double bond and the polymer chain is propagated from the surface of CNTs.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of a polymer/multiwalled carbon nanotube composite and its application in the hydration of ethylene oxide

Yu¹,

Chen²,

He³

et al. 2009

J of Applied Polymer Sci

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Multiwalled carbon nanotubes (MWNTs) were incorporated into the crosslinking network of a styrene-divinylbenzene copolymer (PS-DVB) via suspension polymerization. The prepared crosslinking PS-DVB with MWNTs was first treated with chloromethyl methyl ether to introduce chloromethyl groups through Friedel-Craft reaction; then, the chloromethylation product was reacted with trimethyl amine to obtain the target polymer/carbon nanotube composite: PS-DVB/MWNT ion-exchange resin. The obtained composite was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, Raman spectroscopy, and X-ray photoelectron spectroscopy. The results show the successful incorporation of MWNTs into the polymer network. The physical and chemical properties of the PS-DVB/MWNT ion-exchange resin were nearly the same as those of the controlled sample. With its excellent antiswelling properties, the catalytic behavior of the polymer composite was examined in the hydration of ethylene oxide. Also, it demonstrated excellent stability as a catalyst without a decline in conversion and selectivity in a long-time run.

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“…The thermal stability of nanocomposites is determined by competitive effects. Whereas MWCNTs act as radical scavengers at low loadings [14] delaying the degradation pattern and enhancing thermal stability, it has also been reported that the enhancement in thermal conductivity on MWCNT addition to the matrix lowers the degradation temperatures [32]. The thermal stability of the nanocomposites depends to a certain extent on the interaction between the phases [33] (which can be presumed to be good here at least from the matrix perspective as PPE/PS is miscible) and the amount of residual metal catalyst in the MWCNTs which was used for their production.…”

Section: Characterization Of the Compositesmentioning

confidence: 99%

Multiwalled carbon nanotubes incorporated into a miscible blend of poly(phenylenether)/polystyrene – Processing and characterization

Sathyanarayana

Wegrzyn²,

Olowojoba³

et al. 2013

Express Polym. Lett.

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Abstract. 4 wt% multiwalled carbon nanotubes (MWCNTs) were incorporated into a miscible blend of polyphenylenether/ polystyrene (PPE/PS) on a twin-screw extruder at a screw speed of 600 rpm. The masterbatch obtained was diluted at 400 and 600 rpm to obtain lower MWCNT loadings in PPE/PS. Electron microscopy & optical microscopy images show very good MWCNT dispersion even at high filler loadings of 4!wt%, but slightly larger agglomerate size fractions are observable at higher screw speeds. While MWCNT addition enhanced the thermal stability of PPE/PS, a small change in glass transition was observed on the composites at different filler concentrations compared to PPE/PS. The specific heat capacity at glass transition decreases considerably until 2!wt% MWCNT and levels down thereafter for both processing conditions pointing to enhanced filler-matrix interaction at lower loadings. Storage modulus of the nanocomposites was enhanced significantly on MWCNT incorporation with reinforcing effect dropping considerably as a function of temperature, especially at lower filler contents. The modulus and the tensile strength of PPE/PS were only marginally enhanced in spite of excellent MWCNT dispersion in the matrix. Electrical percolation occurs at 0.4!wt% MWCNT content, and the electrical conductivity of 0.5!wt% MWCNT reinforced PPE/PS was close to 12 orders in magnitude higher compared to PPE/PS.

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Functionalization of Single-Walled Carbon Nanotubes with Well-Defined Polymers by Radical Coupling

Cited by 212 publications

References 41 publications

A Facile Strategy for Preparation of Fluorescent SWNT Complexes with High Quantum Yields Based on Ion Exchange

A Facile Strategy for Preparation of Fluorescent SWNT Complexes with High Quantum Yields Based on Ion Exchange

Synthesis and characterization of a polymer/multiwalled carbon nanotube composite and its application in the hydration of ethylene oxide

Multiwalled carbon nanotubes incorporated into a miscible blend of poly(phenylenether)/polystyrene – Processing and characterization

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