Thermo-viscoelastic properties of silica particulate-reinforced epoxy composites: Considered in terms of the particle packing model

Kwon, Soonchul; Adachi, Tadaharu; Araki, Wakako; Yamaji, Akihiko

doi:10.1016/j.actamat.2006.03.026

Cited by 51 publications

(36 citation statements)

References 16 publications

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“…where it can be observed an increase in the Tg value for all the samples when compared with the neat epoxy. This effect has been previously reported for other polymer based composite materials at comparable inorganic filler loadings [57e59] and epoxy based composite materials with rough surface inorganic particles [60,61], and has been attributed to a local reduction of free volume of the polymer chains nearby the filler surface due to an enhanced interaction between both phases. Accordingly, increasing the polymer/filler contact surface (high specific surface area fillers) may also contribute to hinder the polymer motion [62].…”

Section: Characterization Of Epoxy Based Compositesmentioning

confidence: 60%

Magnetic silica:epoxy composites with a nano- and micro-scale control

Crespo

González

Pozuelo

2014

Materials Chemistry and Physics

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This is a postprint version of the following published document:Crespo, M., González, M. y Pozuelo, J. (2014) h i g h l i g h t s g r a p h i c a l a b s t r a c tWe present a strategy that permits the nanoscale and micro scale con trol through a simple protocol. Cu Ni ferrites were prepared into the structure pores if commercial silica with a size control by annealing temperature.Composites with epoxy matrix wereThe reinforcements provided an increase in glass transition temperature and decomposition temperature of the composites.Multiscale composites with magnetic properties were prepared by incorporating Cu Ni nanoferrites filled silica microparticles in an epoxy matrix. The size of the nanoferrites was controlled both by the structure of the silica template and the annealing temperature (700 and 900 C) used during the syn thesis procedure. The ferrite:silica particles prepared at 700 C showed a narrow size distribution close to 8.3 nm with a superparamagnetic behaviour. A less symmetric size distribution was obtained when annealing was performed at 900 C, with diameters ranging from 15 to 80 nm. The reinforcement incorporation increased up to 7 C the glass transition temperature and 30 C the decomposition tem peratures of the composites. The proposed strategy permits the nanoscale control, by the trapping effect of the silica on the magnetic nanoparticles, as well as the control of the micro scale distribution through a simple protocol. These composites could have potential applicability as EMI shielding materials, owing to their magnetic nature, lightweight and enhanced thermal stability.

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Section: Characterization Of Epoxy Based Compositesmentioning

confidence: 60%

Magnetic silica:epoxy composites with a nano- and micro-scale control

Crespo

González

Pozuelo

2014

Materials Chemistry and Physics

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“…However, it was slightly different from the TMA results that the T g value showed fluctuation with the weight ratio of nano-AlN, and a high T g was observed at lower weight ratios of nano-AlN (0.17-0.33). Kwon et al 26 also found that T g was higher at lower weight ratios of smaller sized silicates (0.2-0.5). The differences between the T g values measured by TMA, DSC, and DMA were also reported by other researchers.…”

Section: Density and Volume Percentagementioning

confidence: 92%

“…25 However, little research has been reported on the effect of size distribution of the filler on the thermomechanical properties of epoxy composites. 26 In this study, polymer matrix composites based on brominated epoxy as the matrix and AlN particles as the filler were prepared. AlN possesses a set of excellent properties, such as a high thermal conductivity (319 W/mK), a high electrical resistivity (5 Â 10 À13 X cm), low thermal expansion coefficient (CTE; 4.5 ppm/K), and good mechanical properties at high temperature ranges.…”

Section: Introductionmentioning

confidence: 99%

Effect of the filler size and content on the thermomechanical properties of particulate aluminum nitride filled epoxy composites

Yung

Zhu

Yue

et al. 2009

J of Applied Polymer Sci

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Polymer matrix composites based on brominated epoxy as the matrix and aluminum nitride (AlN) particles as the filler were prepared. The influences of the size, content, and size distribution of AlN on the thermomechanical properties, including the glass-transition temperature (T g ), coefficient of thermal expansion (CTE), dynamic storage modulus (E 0 ), dynamic loss modulus (E 00 ), and loss factor (tan d), of the composites were investigated by thermomechanical analysis and dynamic mechanical analysis. There was a total change trend for T g ; that is, T g of the composites containing nano-aluminum nitride (nano-AlN; 50 nm) was lower than that of the micro-aluminum nitride (micro-AlN; 2.3 lm) filled composites, especially at high nano-AlN contents. The T g depression of the composites containing nano-AlN was related to the aggregation of nano-AlN and voids in the composites. On the other hand, the crosslink density of the epoxy matrix decreased for nano-AlN-filled composites, which also resulted in a T g depression. The results also show that E 0 and E 00 increased, whereas tan d and CTE of the composites decreased, with increasing the AlN content or increasing nano-AlN fraction at the same AlN content. These results indicate that increasing the interfacial areas between AlN and the epoxy matrix effectively enhanced the dynamic modulus and decreased CTE. In addition, at a fixed AlN content of 10 wt %, a low E 0 of pre-T g (before T g temperature) and high T g were observed at the smaller weight ratio of nano-AlN when combinations of nano-AlN plus micro-AlN were used as the filler. This may have been related to the best packing efficiency at that weight ratio when the bimodal filler was used.

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“…26) Later, Kwon et al extended MT model to multidimensional spherical particles. 27) This model considers that maximum packing factor is dependant on particle size and particle distribution. In order to apply Kwon et al model,27) irregular plate like particles are approximated with multi-dimensional spherical particles using equivalent diameters (D eq ) defined as follows:…”

Section: Mechanical Testsmentioning

confidence: 99%

Dynamic Mechanical Behaviour of Polymer Bonded Nd–Fe–B Composite Materials

et al. 2012

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Magnetic composite materials with varied content of NdFeB particles in epoxy matrix are examined from a dynamic mechanical perspective. Structural, viscoelastic and magnetic properties of composites have been observed using Scanning Electron Microscope (SEM), Dynamic Mechanical Analysis (DMA) and Super Quantum Interference Device (SQUID) magnetometer, respectively. Experimental results show that magnetic properties and corresponding dynamic mechanical behaviour depend on packing density. Also, results observed by predictive mathematical models suggest that maximal packing factor has a direct impact on elastic behaviour of composites.

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Thermo-viscoelastic properties of silica particulate-reinforced epoxy composites: Considered in terms of the particle packing model

Cited by 51 publications

References 16 publications

Magnetic silica:epoxy composites with a nano- and micro-scale control

Magnetic silica:epoxy composites with a nano- and micro-scale control

Effect of the filler size and content on the thermomechanical properties of particulate aluminum nitride filled epoxy composites

Dynamic Mechanical Behaviour of Polymer Bonded Nd–Fe–B Composite Materials

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Thermo-viscoelastic properties of silica particulate-reinforced epoxy composites: Considered in terms of the particle packing model

Cited by 51 publications

References 16 publications

Magnetic silica:epoxy composites with a nano- and micro-scale control

Magnetic silica:epoxy composites with a nano- and micro-scale control

Effect of the filler size and content on the thermomechanical properties of particulate aluminum nitride filled epoxy composites

Dynamic Mechanical Behaviour of Polymer Bonded Nd&ndash;Fe&ndash;B Composite Materials

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Dynamic Mechanical Behaviour of Polymer Bonded Nd–Fe–B Composite Materials