Characterization of carbon nanotube dispersion and filler network formation in melted polyol for nanocomposite materials

Pircheraghi, Gholamreza; Foudazi, Reza; Manas‐Zloczower, Ica

doi:10.1016/j.powtec.2015.02.031

Cited by 19 publications

(12 citation statements)

References 51 publications

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“…In order to better understand and evaluate the effect of dispersion state on filler network strength/quality, rotational shear rheology was performed on these samples. Literature reports indicate that rotational shear rheological measurements are more sensitive to nanoscale dispersion and the amount of individually dispersed nanofillers (Fan and Advani 2007;Pircheraghi et al 2015) because a fragile network of filler can be easily destroyed by applied shear in these experiments (Fan and Advani 2007). Figure 5 shows shear viscosity dependence on shear rate for different suspension samples.…”

Section: Resultsmentioning

confidence: 97%

“…Rheological measurements in rotational and oscillatory shear modes can be used for assessment of filler dispersion state at nanoscale and network formation in polymeric suspensions, respectively (Pircheraghi et al 2015). Figure 4 shows the dependence of complex viscosity (g*), storage modulus (G 0 ) and tan d on the oscillatory frequency (x) for different samples.…”

Section: Resultsmentioning

confidence: 99%

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Use of surfactants in cellulose nanowhisker/epoxy nanocomposites: effect on filler dispersion and system properties

et al. 2015

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Cellulose nanowhiskers (CNWs) prepared via TEMPO mediated oxidation are used as biodegradable filler in an epoxy matrix. Since CNWs are hydrophilic and epoxy is hydrophobic, amphiphilic block copolymer surfactants are employed to improve the interactions between the filler and the matrix. The surfactants used are Pluronics, a family of triblock copolymers containing two poly(ethylene oxide) blocks and one poly(propylene oxide) block. In this study, Pluronic L61 and L121 with molecular weight of 2000 and 4400 g/mol and hydrophilic to lipophilic balance of 3 and 1 respectively, are used and their effect on the dispersion of CNWs in epoxy is discussed. The hydrophilic tails of Pluronics interact with the hydroxyl and carboxylic groups on the CNW surface and then these surfactant-treated CNWs are directly incorporated into epoxy by high speed mixing. The dispersion state of the surfactant-treated CNWs in epoxy is assessed by rheological measurements and the mechanical properties of the resulting composites are characterized by tensile test and dynamic mechanical thermal analysis. The Pluronic L61 treated CNW/ epoxy composites show the highest storage modulus at high temperatures (about 77 % increases) indicative of improved interfacial interactions between the CNWs and the epoxy matrix. Also, an increase of around 10°C in the glass-rubbery transition temperature of the L61 treated CNW/epoxy composite leads to potential application at higher service temperatures.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Use of surfactants in cellulose nanowhisker/epoxy nanocomposites: effect on filler dispersion and system properties

et al. 2015

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“…From the experiments, the authors concluded that properly dispersed suspensions produced composites with physical properties that had four orders of magnitudes in variation compared with well-dispersed suspensions. Pircheraghi et al [61] studied the characterization of CNT dispersion in melted semicrystalline media using ultrasonication without the aid of solvents. They compared three commercially available multiwalled carbon nanotubes (CNTs) with different aspect ratios to a control using UV-Vis spectroscopy.…”

Section: Methods That Monitor a Single Point On The Curvementioning

confidence: 99%

A Review of Spectral Methods for Dispersion Characterization of Carbon Nanotubes in Aqueous Suspensions

Njuguna

Vanli

Liang

2015

Journal of Spectroscopy

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Characterization is a crucial step in the study of properties of nanomaterials to evaluate their full potential in applications. Carbon nanotube-based materials have properties that are sensitive to size, shape, concentration, and agglomeration state. It is therefore critical to quantitatively characterize these factors in situ, while the processing takes place. Traditional characterization techniques that rely on microscopy are often time consuming and in most cases provide qualitative results. Spectroscopy has been studied as an alternative tool for identifying, characterizing, and studying these materials in situ and in a quantitative way. In this paper, we provide a critical review of the spectroscopy techniques used to explore the surface properties (e.g., dispersion) characteristics of carbon nanotubes in aqueous suspensions during the sonication process.

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“…In contrast to the dispersion of CNTs in organic solutions [27,28] and near neutral aqueous media [23], it is difficult to achieve a stable CNT dispersion in strong Ca 2+ based alkaline media where the CNTs tend to agglomerate at a measurable rate. Studies have demonstrated that surfactant-dispersed CNTs can be colloidally stable in water without significant agglomeration for weeks [29].…”

Section: Introductionmentioning

confidence: 99%

Agglomeration process of surfactant-dispersed carbon nanotubes in unstable dispersion: A two-stage agglomeration model and experimental evidence

et al. 2016

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Characterization of carbon nanotube dispersion and filler network formation in melted polyol for nanocomposite materials

Cited by 19 publications

References 51 publications

Use of surfactants in cellulose nanowhisker/epoxy nanocomposites: effect on filler dispersion and system properties

Use of surfactants in cellulose nanowhisker/epoxy nanocomposites: effect on filler dispersion and system properties

A Review of Spectral Methods for Dispersion Characterization of Carbon Nanotubes in Aqueous Suspensions

Agglomeration process of surfactant-dispersed carbon nanotubes in unstable dispersion: A two-stage agglomeration model and experimental evidence

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