Effects of interaction between filler and resin on the glass transition and dielectric properties of epoxy resin nanocomposites

Mori, Keigo; Hirai, Naoshi; Ohki, Yoshimichi; Otake, Yasutomo; Umemoto, Takuya; Muto, Hirotaka

doi:10.1049/iet-nde.2018.0041

Cited by 23 publications

(14 citation statements)

References 20 publications

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“…This finding can be a clue to the mechanism of the superior dielectric properties that good combinations of filler and polymer exhibit. We have already reported several experimental results, which indicate that the addition of nanofiller alters various properties of the host resin [1–3,7,8]. The fact that T g is changed by the addition of nanofiller as shown in Fig.…”

Section: Resultsmentioning

confidence: 94%

“…Nanocomposites, namely, host polymer materials with nanosized inorganic additives, have attracted much attention for their superior insulating performances. The authors are at present conducting joint research [1][2][3][4][5][6][7], aiming at using the nanocomposites into the ground-wall insulation of high-voltage large rotating electric machines, by which the insulating thickness can be decreased and the efficiency of the machines can be improved.…”

Section: Introductionmentioning

confidence: 99%

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Filler‐dependent changes in thermal, dielectric, and mechanical properties of epoxy resin nanocomposites

Nagase

Iizuka

Tatsumi

et al. 2020

IEEJ Transactions Elec Engng

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We added nanofillers of MgO, Mg(OH)2, SiO2, and TiO2 to epoxy resin by high‐pressure shearing at a content of 1 vol%. The glass transition temperature (Tg), dielectric properties, and mechanical properties were measured for these nanocomposites. As a result, Tg decreases in all the nanocomposites. When the filler is MgO or Mg(OH)2, the increase of the real part (ϵr′) and that of the imaginary part (ϵr″) of complex permittivity are significantly suppressed at high temperatures by the filler loading. On the other hand, when the filler is SiO2 and TiO2, the suppression of the increase in ϵr′ and ϵr″ is not obvious. Furthermore, regardless of the filler material, the addition of nanofiller hardly affects the mechanical storage modulus at 200°C. These results indicate that the difference in filler material gives more significant effects on dielectric properties than on mechanical properties. © 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Filler‐dependent changes in thermal, dielectric, and mechanical properties of epoxy resin nanocomposites

Nagase

Iizuka

Tatsumi

et al. 2020

IEEJ Transactions Elec Engng

Self Cite

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“…Finally, this work could also prove helpful for better apprehending macroscopic effects with epoxy-amine-metal systems, such as the role of filler addition for applicative purposes (e.g. [33]).…”

Section: Discussionmentioning

confidence: 99%

Further insight on amine-metal reaction in epoxy systems

Drouet

Salles

Fritah

et al. 2021

Surfaces and Interfaces

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Among thermosetting polymers, epoxy resins are major components of adhesives, sealants, paints and composites. Polymerization is often achieved by reaction of epoxy monomers like DGEBA with amine hardeners such as DETA. Previous works showed that polyamines interact with metal (hydr/oxide) substrates leading to the formation of an interphase involving the chelation of surface metal ions. In this work, we further explored the interaction between DETA and aluminum (hydr)oxide, denoted Al, via a combined experimental and modeling approach. We inspected in depth by DSC the modifications of glass transition temperature T g and change in heat capacity ΔC p after curing, allowing us quantifying the impact of Al amount on DGEBA/DETA degree of cure α. A new parameter, the "percentage of inhibition of cure" denoted α, was defined reaching up to ~4 % in our experimental conditions. In parallel, in situ mixing calorimetry confirmed the exothermic character of DETA interaction with Al with various degrees of division. DFT calculations were carried out to examine DETA/Al 3+ chelates. Among plausible chelate configurations, one was associated with a lower conformational energy and shorted Al-N bond lengths, suggesting greater stability. Calculated and experimental Raman spectra were additionally investigated, allowing us to discuss further about the DETA/Al 3+ chelates at play.

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“…The decay rate is fast in the low-frequency range, and slows down with an increasing frequency. This typical frequency-dependence behavior is mainly derived from the combination effect of multi-type polarization which exists in TiO 2 @SiO 2 /PDMS composites, such as interfacial polarization of heterogeneous interfaces [ 49 ], and dipole orientation polarization of fillers and polymer matrix. When an external electric field applied to the composite, free charges could accumulate at the interfaces between core (TiO 2 )-shell (SiO 2 ), shell (SiO 2 )-matrix (PDMS), and also the crystal defects in PDMS matrix.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electromechanical Property of Silicone Elastomer Composites Containing TiO2@SiO2 Core-Shell Nano-Architectures

et al. 2021

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Dielectric elastomer (DE) is one type of promising field-activated electroactive polymer. However, its significant electromechanical actuated properties are always obtained under a giant electric voltage, which greatly restricts the potential applications of DE. In the present work, the well-constructed core-shell TiO2@SiO2 nanoparticles were fabricated by using the classical Stöber method. A series of TiO2@SiO2 nano-architectures-filled polydimethylsiloxane (PDMS) composites were prepared via solution blending and compression-molding procedures. Benefiting from the additional SiO2 shell, both the interfacial compatibility between fillers and matrix and core-shell interfacial interaction can be improved. The TiO2@SiO2/PDMS nanocomposites exhibit a significantly enhanced in-plane actuated strain of 6.08% under a low electric field of 30 V·μm−1 at 16 vol.% TiO2@SiO2 addition, which is 180% higher than that of neat PDMS. The experimental results reveal that the well-designed core-shell structure can play an important role in both improving the electromechanical actuated property and maintaining a good flexibility of DE composites. This research provides a promising approach for the design of the novel composites with advanced low-field actuated electromechanical property in next generation DE systems.

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Effects of interaction between filler and resin on the glass transition and dielectric properties of epoxy resin nanocomposites

Cited by 23 publications

References 20 publications

Filler‐dependent changes in thermal, dielectric, and mechanical properties of epoxy resin nanocomposites

Filler‐dependent changes in thermal, dielectric, and mechanical properties of epoxy resin nanocomposites

Further insight on amine-metal reaction in epoxy systems

Enhanced Electromechanical Property of Silicone Elastomer Composites Containing TiO2@SiO2 Core-Shell Nano-Architectures

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