Recent development in the synthesis of polymer nanocomposites based on nano-alumina

Mallakpour, Shadpour; Khadem, Elham

doi:10.1016/j.progpolymsci.2015.07.004

Cited by 179 publications

(75 citation statements)

References 120 publications

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“…In a second publication by the same authors [23], the effect of water conditioning was investigated in detail and, here, it was found that the electrical conductivity of the nanocomposites was higher than that of the unfilled reference material, particularly following storage under wet conditions. Improved thermal conductivity has been reported extensively for relatively high filler loadings (>10 %) for alumina dispersed within various host polymers [24][25][26], which could be advantageous in a technological application such as high voltage cables, permitting heat from the conductor core to be extracted more readily, so increasing ratings [27]. However many studies indicate that such high filler loadings are detrimental to dielectric properties [14,16,17,28,29] such that, in practice, a trade-off between thermal conductivity and dielectric properties may be required.…”

Section: Introductionmentioning

confidence: 98%

The Effects of Water on the Dielectric Properties of Aluminum-Based Nanocomposites

Hosier¹,

Praeger²,

Vaughan

et al. 2017

IEEE Trans. Nanotechnology

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Abstract-A series of polyethylene nanocomposites was prepared utilizing aluminum nitride or alumina nano-powders with comparable morphologies. These were subsequently subjected to different conditioning regimes, namely prolonged storage in vacuum, the ambient laboratory environment or in water. The effect of filler loading and conditioning (i.e. water content) on their morphological and dielectric properties was then examined. Measurements indicated that, in the case of aluminum nitride nanocomposites, none of the conditioning regimes led to significant absorption of water and, as such, neither the dielectric properties nor the DC conductivity varied. Conversely, the alumina nanocomposites were prone to the absorption of an appreciable mass of water, which resulted in them displaying a broad dielectric relaxation, which shifted to higher frequencies, and a higher DC electrical conductivity. We ascribe these different effects to the interfacial surface chemistry present in each system and, in particular, the propensity for hydrogen bonding with water molecules diffusing through the host matrix. Technologically, the use of nanocomposites based upon systems such as aluminum nitride, in place of the commonly used metal oxides (alumina, silica, etc.), eliminates variations in dielectric properties due to absorption of environmental water without resorting to the adoption of techniques such as surface functionalization or calcination in an attempt to render nanoparticle surface chemistry hydrophobic.

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Section: Introductionmentioning

confidence: 98%

The Effects of Water on the Dielectric Properties of Aluminum-Based Nanocomposites

Hosier¹,

Praeger²,

Vaughan

et al. 2017

IEEE Trans. Nanotechnology

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“…The structure assignment of the polymers was based on -FTIR-spectroscopy. Table 3 and figures (7,8) show a stretching band for polymers.…”

Section: Resultsmentioning

confidence: 99%

Grafting of Different Monomers onto Nano Aluminum Surface and Studying Their Biological Activities

Sultan¹,

Atwan²

2017

IHJPAS

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The research includes the preparation of two nano polymer ( , ) through a grafted nano ceramic material (aluminum oxide )(80 nm) by acrylic acid monomer. The latter was extended with two different ester monomers using free radical polymerization. The antibacterial activity of the prepared compounds) performed according to the agar diffusion method. All compounds (1, 2, 3, 4, NP 1 , NP 2 ) showed inhibition against bacterial.

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“…The films thickness ( L ) was derived from the mass of polymer deposited in the electrode ( m pol ) using the procedure reported by Schirmeisen and Beck . Accordingly, m pol was determined with the following relation:

m_{p o l} = Q_{p o l} true(\frac{m}{Q} true)

where Q pol is the polymerization charge consumed in the generation of each layer (in mC/cm 2 ) and m / Q is the current productivity (with values in between 0.45 ± 0.02 and 0.70 ± 0.06 mg/C, depending on the composition).…”

Section: Methodsmentioning

confidence: 99%

Properties of In situ polymerized poly(3,4‐ethylenedioxythiophene)/alumina composites for energy storage applications

Saborío

Estrany

Alemán

2017

J Polym Sci B Polym Phys

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Composites formed by poly (3,4-ethylenedioxythiophene) and alumina (PEDOT/Al 2 O 3 ) have been prepared by in situ anodic polymerization. For this purpose, the stability of 1:1 and 4:1 monomer:alumina aqueous solutions has been examined as a function of the pH (2.3, 4.0, 7.0, 8.8 or 10.8). Results indicate that the monomer behaves as a dispersant that remains stable at the studied basic pHs despite they are close to the isoelectric point of alumina. Although the thermal stability of the composites is considerably affected by the pH of the reaction medium, its influence on the surface morphology is very small. Independently of the synthetic conditions, the electrochemical properties were better for PEDOT/Al 2 O 3 than for pure PEDOT, reflecting that alumina particles promote the charge mobility. The highest specific capacitance (141 F/g), which was 55% higher than that obtained for pure PEDOT, was achieved for the composite prepared at pH= 8.8 using a 4:1 monomer:alumina ratio.These conditions favour the participation of OH -groups as secondary doping agents without degrading the polymer matrix and enhance the specific surface of the films, facilitating the ionic mobility. On the other hand, application of a multi-step polymerization strategy has shown that interfaces originated by consecutive steps enhance the specific capacitance.

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Recent development in the synthesis of polymer nanocomposites based on nano-alumina

Cited by 179 publications

References 120 publications

The Effects of Water on the Dielectric Properties of Aluminum-Based Nanocomposites

The Effects of Water on the Dielectric Properties of Aluminum-Based Nanocomposites

Grafting of Different Monomers onto Nano Aluminum Surface and Studying Their Biological Activities

Properties of In situ polymerized poly(3,4‐ethylenedioxythiophene)/alumina composites for energy storage applications

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