Preparation and characterisation of epoxy/alumina polymer nanocomposites

Johnsen, Bernt Brønmo; Frømyr, Tomas Roll; Thorvaldsen, Tom; Olsen, Torbjørn

doi:10.1080/15685543.2013.815603

Cited by 20 publications

(15 citation statements)

References 28 publications

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“…Albeit while the maximum content (40 wt%) of the corundum platelets was much lower, incorporation of the smallest nanoplatelets with a side length of 0.6 µm increased the storage modulus to 4400 MPa (+83%). In accordance with the literature, the filler addition only marginally affected glass transition temperatures (79–81 °C) which were similar to that of the epoxy matrix (85 °C) …”

Section: Resultssupporting

confidence: 91%

Corundum Fillers with Variable Sizes and Shapes for Epoxy Nanocomposites as High‐Performance Chemical Anchoring and Bonding Systems

Huber

Angarano

Mülhaupt

2018

Macro Materials & Eng

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Herein, the influence of corundum filler types and contents on the morphological, thermal, and mechanical properties of epoxy nanocomposites tailored for applications as chemical anchoring and bonding systems is investigated. Up to 65 wt% corundum particles with aspect ratios (AR) varying between 1 and 70, average particle sizes ranging from 500 nm to 48 µm, and nanoplatelet thickness varying from 40 to 300 nm, are uniformly dispersed in amine‐cured epoxy resins. At both 25 and 50 wt% filler content, the properties of corundum/epoxy composites are far superior to those of the corresponding benchmark epoxy composites containing a conventional filler such as cement, talcum, or sand. The incorporation of corundum nanoplatelets with AR of 50, length of 2 µm, and thickness of 40 nm, significantly improves Young's modulus (3.5–9.8 GPa) and fracture toughness KIc (0.83–1.24 MPam) of epoxy nanocomposites at the expense of tensile strength (72–49 MPa). The pull‐out values of the corresponding chemical anchoring systems substantially improve with decreasing sub‐micrometer corundum particle sizes and correlate with tensile strength of the corundum/epoxy nanocomposites, but are much less dependent on corundum particle morphologies, filler aspect ratio, and Young's modulus of the corundum/epoxy composite.

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Section: Resultssupporting

confidence: 91%

Corundum Fillers with Variable Sizes and Shapes for Epoxy Nanocomposites as High‐Performance Chemical Anchoring and Bonding Systems

Huber

Angarano

Mülhaupt

2018

Macro Materials & Eng

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“…However, the breakdown strength was reduced at higher filler loading levels. Another study [15] considered the morphology and mechanical properties of epoxy/alumina nanocomposites and demonstrated that probe sonication was an effective way to remove aggregates in the nano-powder. AC breakdown strength was considered [16] and, again, a 5 % filler loading provided enhanced performance but higher filler loadings had detrimental effects.…”

Section: Introductionmentioning

confidence: 99%

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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“…In the biomedical field, HDPE composites were recently investigated for application in total hip artificial joints [10]. Previous researches focused on improving the strength of HDPE composites by reinforcing, varieties of nonmetallic reinforcements [11][12][13][14]. Song et al [11] reinforced HDPE with Nanodiamond to improve the fire retardability of such polymers.…”

Section: Introductionmentioning

confidence: 99%

“…However, this process produced low strength polymer and in addition, the cost of such polymer was found to be high. Johnsen et al [12] used Alumina as reinforcements in HDPE and observed a considerable increase in mechanical properties. However, the analysis of thermal properties does not show any significant change.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the influence of tungsten particulate in mechanical and thermal properties of HD50MA180 high density polyethylene composites

Panneerselvam

2020

Mater. Res. Express

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In this present investigation, the influence of reinforcing tungsten (W) particles in High-Density Polyethylene (HDPE) on mechanical and thermal properties, has been studied. W reinforced HDPE composites are processed by melt compounding method, with W varied in proportion of 1%, 3%, 5% and 7% by weight. The test specimens were prepared by injection molding as per ASTM standards and analyzed by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Mechanical and Thermal Characterization. XRD results show that, the intensity count at angle 40.3°, 58.7°, 73.6°and 87.1°increases with the increase in wt% of W particles. SEM analysis reveals that, composites containing 1wt% of W has uniform dispersion in the HDPE matrix. In mechanical characterization, tensile strength and flexural strength of the specimen reported a sharp increase with the addition of W at 1wt%, followed by a negative trend for the higher content of W particles. However, the impact strength result shows that specimen with 3wt% of W content has the highest toughness. Further from thermal characterization, Thermo Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) results show that degradation temperature and the melting point of composites improve with an increase in W content. Composite with 7wt% W content has the highest degradation temperature and melting point.

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Preparation and characterisation of epoxy/alumina polymer nanocomposites

Cited by 20 publications

References 28 publications

Corundum Fillers with Variable Sizes and Shapes for Epoxy Nanocomposites as High‐Performance Chemical Anchoring and Bonding Systems

Corundum Fillers with Variable Sizes and Shapes for Epoxy Nanocomposites as High‐Performance Chemical Anchoring and Bonding Systems

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

Investigation on the influence of tungsten particulate in mechanical and thermal properties of HD50MA180 high density polyethylene composites

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