Electrical and Dielectric Properties of Rubber

Roland, C. M.

doi:10.5254/rct.15.84827

Cited by 18 publications

(7 citation statements)

References 85 publications

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“…A modest loss of dissipation factor is generally attributed to the movement of polymer chains and reorientation of the segments. The inverse of the frequency at the maximum loss is expressed in terms of relaxation time and is denoted by τ . It depends on the factors such as Maxwell–Wagner–Sillars effect (MW), electric dipole polarization (D), and leakage conductivity loss (DC) …”

Section: Resultsmentioning

confidence: 99%

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Designing Supertough and Ultrastretchable Liquid Metal-Embedded Natural Rubber Composites for Soft-Matter Engineering

Banerjee

Mandal

Arief

et al. 2021

ACS Appl. Mater. Interfaces

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Functional elastomers with incredible toughness and stretchability are indispensable for applications in soft robotics and wearable electronics. Furthermore, coupled with excellent electrical and thermal properties, these materials are at the forefront of recent efforts toward widespread use in cutting-edge electronics and devices. Herein, we introduce a highly deformable eutectic-GaIn liquid metal alloy-embedded natural rubber (NR) architecture employing, for the first time, industrially viable solid-state mixing and vulcanization. Standard methods of rubber processing and vulcanization allow us to fragment and disperse liquid metals into submicron-sized droplets in cross-linked NR without compromising the elastic properties of the base matrix. In addition to substantial boosts in mechanical (strain at failure of up to ∼650%) and elastic (negligible hysteresis loss) performances, the tearing energy of the composite was enhanced up to 6 times, and a fourfold reduction in the crack growth rate was achieved over a control vulcanizate. Moreover, we demonstrate improved thermal conductivity and dielectric properties for the resulting composites. Therefore, this work provides a facile and scalable pathway to develop liquid metal-embedded soft elastomeric composites that could be instrumental toward potential applications in soft-matter engineering.

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Section: Resultsmentioning

confidence: 99%

“…The inverse of the frequency at the maximum loss is expressed in terms of relaxation time and is denoted by τ. 49 It depends on the factors such as Maxwell−Wagner−Sillars effect (MW), electric dipole polarization (D), and leakage conductivity loss (DC). 50…”

mentioning

confidence: 99%

Designing Supertough and Ultrastretchable Liquid Metal-Embedded Natural Rubber Composites for Soft-Matter Engineering

Banerjee

Mandal

Arief

et al. 2021

ACS Appl. Mater. Interfaces

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“…The addition of electrical conductive particles into rubber matrices led to the formation of a filler network. The concentration of filler at which this filler networking is achieved is called the percolation threshold [ 12 , 77 , 78 ]. The variation of the electrical conductivity for the studied samples is shown in Figure 11 .…”

Section: Resultsmentioning

confidence: 99%

Sulfur-Modified Carbon Nanotubes for the Development of Advanced Elastomeric Materials

et al. 2021

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The outstanding properties of carbon nanotubes (CNTs) present some limitations when introduced into rubber matrices, especially when these nano-particles are applied in high-performance tire tread compounds. Their tendency to agglomerate into bundles due to van der Waals interactions, the strong influence of CNT on the vulcanization process, and the adsorptive nature of filler–rubber interactions contribute to increase the energy dissipation phenomena on rubber–CNT compounds. Consequently, their expected performance in terms of rolling resistance is limited. To overcome these three important issues, the CNT have been surface-modified with oxygen-bearing groups and sulfur, resulting in an improvement in the key properties of these rubber compounds for their use in tire tread applications. A deep characterization of these new materials using functionalized CNT as filler was carried out by using a combination of mechanical, equilibrium swelling and low-field NMR experiments. The outcome of this research revealed that the formation of covalent bonds between the rubber matrix and the nano-particles by the introduction of sulfur at the CNT surface has positive effects on the viscoelastic behavior and the network structure of the rubber compounds, by a decrease of both the loss factor at 60 °C (rolling resistance) and the non-elastic defects, while increasing the crosslink density of the new compounds.

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“…Therefore diffusion of graphite into an insulative rubber matrix resulted in a conductive composite. 22 Maximum AC conductivity was achieved at 30 phr filler loading…”

Section: Dielectric Propertiesmentioning

confidence: 93%

An investigation on the tribological and mechanical properties of silicone rubber/graphite composites

Sarath¹,

Reghunath

Thomas

et al. 2021

Journal of Composite Materials

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In this study, tribological properties and surface characteristics of silicone rubber/graphite (QMG) composites were investigated as a function of applied load, sliding velocity (1–5 m/s) and temperature. This study discusses a novel approach to improve the tribological properties of silicone rubber (QM). Inclusion of graphite significantly reduces the friction coefficient (̴40%) and specific wear rate of QM (50%). Wear mechanism involves formation of transfer film at the interphase between composite and steel counter surface. Tribological performance of QMG composites were found to be in agreement with its morphological, mechanical and dielectric properties.

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Electrical and Dielectric Properties of Rubber

Cited by 18 publications

References 85 publications

Designing Supertough and Ultrastretchable Liquid Metal-Embedded Natural Rubber Composites for Soft-Matter Engineering

Designing Supertough and Ultrastretchable Liquid Metal-Embedded Natural Rubber Composites for Soft-Matter Engineering

Sulfur-Modified Carbon Nanotubes for the Development of Advanced Elastomeric Materials

An investigation on the tribological and mechanical properties of silicone rubber/graphite composites

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