Functionalized Multi‐Walled Carbon Nanotubes Prepared by In Situ Polycondensation of Polyurethane

Chen, Xianhong; Chen, Xiaojin; Lin, Ming–Fa; Zhong, Wenbin; Chen, Xiaohua; Chen, Zhenhua

doi:10.1002/macp.200600593

Cited by 46 publications

(27 citation statements)

References 48 publications

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“…Figure 1(b) shows the infrared spectrum of HO‐PACl‐MWCNTs, and it exhibits two absorption bands at 3439 and 2925 cm −1 , respectively. The broad band at 3439 cm −1 was assigned to OH stretch vibration in hydroxyl groups, the peak at 2925 cm −1 was identified as CH 2 stretch vibration attributed to the grafted ethylene glycol 23, 24. These features indicated that PACl‐MWCNTs was esterified by ethylene glycol.…”

Section: Resultsmentioning

confidence: 95%

Multi‐walled carbon nanotubes encapsulated with polyurethane and its nanocomposites

Wang

Zhang

et al. 2008

J. Polym. Sci. A Polym. Chem.

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Poly(acryloyl chloride) (PACl) was employed to enhance the surface of multi‐walled carbon nanotubes (MWCNTs). MWCNTs were first acid treated to generate hydroxyl groups on the surface, which was reacted with PACl to obtain an encapsulation. The numerous acryloyl chloride groups on the out layer were esterified with a proper amount of ethylene glycol (EG). Subsequently, 4,4′‐methylenebis (phenylisocyanate) (MDI) and 1,4‐butanediol (BDO) were introduced into the system, and a polyurethane (PU) layer was formed in situ. The formation of PU layers on MWCNTs was confirmed by Fourier transform infrared spectrometer (FTIR) and X‐ray photoelectron spectroscope (XPS). The morphology of encapsulated MWCNTs was observed by transmission electron microscope (TEM) and scanning electron microscope (SEM). Thermo gravimetric analysis (TGA) showed the grafted polymer fraction was up to 90%. On introducing the modified MWCNTs into a PU matrix, an increase in tensile strength by 60.6% and improvement in modulus by 6.3% over neat PU was observed. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 4857–4865, 2008

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Section: Resultsmentioning

confidence: 95%

Multi‐walled carbon nanotubes encapsulated with polyurethane and its nanocomposites

Wang

Zhang

et al. 2008

J. Polym. Sci. A Polym. Chem.

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“…[29,35] It is seen from Figure 1 that the D-and G-bands can be observed for all samples, and is characteristic for the tubular structure of MWCNTs. [36] In contrast with the purified MWCNTs, the D-and G-bands of the functionalized samples are shifted by about 10 cm À1 towards lower frequencies, which should be associated with the covalent attachment of organic moieties to the nanotube surface. Moreover, the relative intensity ratios of the D-and G-bands (R D /R G ), which are used to probe the degree of functionalization, distinctly increase.…”

Section: Resultsmentioning

confidence: 99%

A Scalable Route to Highly Functionalized Multi‐Walled Carbon Nanotubes on a Large Scale

Chen

Wang

Zhong

et al. 2008

Macro Chemistry & Physics

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A scalable and solvent‐free chemical process to obtain highly functionalized and dispersible multi‐walled carbon nanotubes is reported. Highly functionalized multi‐walled carbon nanotubes have been prepared using in situ generated aryl diazonium salts in the presence of ammonium persulfate and 2,2′‐azoisobutyronitrile by solvent‐free techniques. In the Raman spectra of the resulting materials, characteristic peaks, the D‐ and G‐bands, are shifted by about 10 cm−1 to lower frequencies. At the same time, the relative intensity ratios between the D‐ and G‐bands increase in comparison to that in the spectrum of the purified product. Fourier‐transform infrared spectroscopy reveals the presence of the functional groups on the surface. Transmission electron microscopy images directly confirm the significant build‐up of sidewall organic moieties on the treated materials. The weight loss of various functional moieties determined by thermogravimetry–differential scanning calorimetry analysis is about 18–33%. The dispersibility of the functionalized materials in solvents, such as chloroform, tetrahydrofuran, and water, is obviously improved.magnified image

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“…In all the spectra, the characteristic vibration bands of polyurethane such as ν(CH2) at 2930, ν(C=O) at 1736, ν(C=C) at 1620, δ (C-H) at 1445, and ν(C-O) at 1090 cm -1 are observed [29]. These characteristic polymer bands decrease in intensity with UTG content.…”

Section: More Sensitive Information On What Concerns Possible Interacmentioning

confidence: 91%

The effect of ultra-thin graphite on the morphology and physical properties of thermoplastic polyurethane elastomer composites

Menes

Cano

Benedito

et al. 2012

Composites Science and Technology

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Composites of thermoplastic polyurethane (TPU) and ultra-thin graphite (UTG) with concentrations ranging from 0.5 to 3 wt% were prepared using a solution compounding strategy. Substantial reinforcing effects with increased loadings are achieved. Compared to neat TPU, values for storage modulus and shear viscosity are enhanced by 300 % and 150 %, respectively, for UTG concentrations of 3 wt%. Additionally, an enhancement of thermal properties is accomplished. The crystallization temperature and thermal stability increased by 30 ºC and 10 ºC, respectively, compared to neat TPU. Controlling the oxidation degree, thus offers further possibilities to obtain composites with tailored properties. The presented approach is straightforward, leads to homogeneous TPU-UTG composites with improved materials properties and is especially suitable for commercial UTG materials and further up-scaled production.

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Functionalized Multi‐Walled Carbon Nanotubes Prepared by In Situ Polycondensation of Polyurethane

Cited by 46 publications

References 48 publications

Multi‐walled carbon nanotubes encapsulated with polyurethane and its nanocomposites

Multi‐walled carbon nanotubes encapsulated with polyurethane and its nanocomposites

A Scalable Route to Highly Functionalized Multi‐Walled Carbon Nanotubes on a Large Scale

The effect of ultra-thin graphite on the morphology and physical properties of thermoplastic polyurethane elastomer composites

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