Effect of selective localization on dielectric properties of boron nitride nanofiller filled linear low density polyethylene (LLDPE)/silicone rubber (SR) blends

Polymer Engineering & Sci

Mariatti

2018

Thermoplastic elastomer (TPE) has gained acceptance as third generation of polymeric materials for high voltage (HV) insulators. The interesting features showed by TPEs were found to fulfill some particular requirements for HV insulations, at least for the distribution class applications, especially at light contamination environments. Introduction of nanomaterials which widely reported to give significant improvements in the electrical, mechanical, thermal and other properties of polymer has attracted attention to the synergistic properties of combining the two complementary technologies of thermoplastic elastomers and nanocomposites. In this paper, research works on various types of TPEs having promising performance as HV insulators are thoroughly reviewed. The emergence of nanocomposites in the electrical insulation field and the important properties consideration for HV insulators as well as the processing techniques of TPE nanocomposites are also discussed. Finally, some of the past and recent developments of TPE nanocomposites focusing on the electrical insulation properties are highlighted in this article. POLYM. ENG. SCI., 58:E36–E63, 2018. © 2018 Society of Plastics Engineers

Section: The Emergence Of Thermoplastic Elastomer In Electrical Insulmentioning

confidence: 99%

Section: The Emergence Of Thermoplastic Elastomer In Electrical Insulmentioning

confidence: 99%

A review of thermoplastic elastomeric nanocomposites for high voltage insulation applications

Polymer Engineering & Sci

Mariatti

2018

“…LLDPE/SR nanocomposites filled with 2 vol% BN nanofiller were prepared through melt‐mixing in a Haake internal mixer at 170°C and 50 rpm. A two‐step mixing method was adopted for the preparation of the nanocomposites on the basis of our previous work . This method showed the optimum electrical insulating properties.…”

Section: Methodsmentioning

confidence: 99%

“…They have high thermal conductivity, excellent thermal and chemical stability, as well as desirably low dielectric permittivity and loss . BN‐based nanocomposites have great potential for application in HV electrical insulators as they are reported to possess not only high insulating properties, but also good thermal conduction to effectively dissipate the heat generated within the insulator, thus preventing thermal runaway . Previous research by Hidayah et al on BN nanofiller‐filled LLDPE/SR nanocomposites by 2–8 vol% showed a significant improvement in electrical breakdown strength.…”

Section: Introductionmentioning

confidence: 99%

“…BN‐based nanocomposites have great potential for application in HV electrical insulators as they are reported to possess not only high insulating properties, but also good thermal conduction to effectively dissipate the heat generated within the insulator, thus preventing thermal runaway . Previous research by Hidayah et al on BN nanofiller‐filled LLDPE/SR nanocomposites by 2–8 vol% showed a significant improvement in electrical breakdown strength. Tsekmes et al reported a reduction in the relative permittivity of epoxy‐BN nanocomposites with an increase in the filler content at low filler concentrations, and the minimum relative permittivity for these nanocomposites was achieved when the filler concentration was nearly 0.6 vol%.…”

Section: Introductionmentioning

confidence: 99%

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Effect of electron beam irradiation on dielectric properties, morphology and melt rheology of linear low density polyethylene/silicone rubber‐based thermoplastic elastomer nanocomposites

Mariatti

Polymer Engineering & Sci

et al. 2017

In this study, thermoplastic elastomer nanocomposites based on linear low density polyethylene (LLDPE)/silicone rubber (SR; 90:10) filled with a 2 vol% boron nitride (BN) nanofiller were exposed to electron beam (EB) irradiation at low irradiation doses (20, 40, 50, and 100 kGy). The response of the LLDPE/SR/BN nanocomposites to the EB irradiation crosslinking was examined and compared with the non‐irradiated samples in terms of dielectric properties (permittivity and loss tangent), dielectric breakdown strength, morphology, and rheological properties. A swelling study was performed to quantify the degree of crosslinking and it was found that the crosslink density increased slightly upon EB irradiation. Scanning electron microscopy results provided evidence that the SR phase was selectively crosslinked and interfacial adhesion was improved in irradiated samples. A good correlation was observed between the morphology and the dynamic storage modulus obtained from the melt rheological experiments. The optimum irradiation dose was found to be 20 kGy, which was marked by an improved dielectric breakdown strength, a permittivity‐frequency curve plateau and a reduced loss tangent value. POLYM. ENG. SCI., 58:E135–E144, 2018. © 2017 Society of Plastics Engineers

J of Applied Polymer Sci

Melt‐reprocessable linear low‐density polyethylene/cyclic olefin copolymer blends with low dielectric constant and low thermal expansion

Zhang,

Jiang,

et al. 2024

Insulation materials with low dielectric constants, low coefficients of thermal expansion (CTE), low densities, renewability, and low cost are urgently needed in the fields of communication, control and signal cables. Here we report that combining cyclic olefin copolymer (COC) with linear low‐density polyethylene (LLDPE) by melt blending achieves the above goals. The dielectric constant and CTE of LLDPE/COC blends are minimized at 20 wt% COC content, reaching a value of 2.23 at 1000 Hz and 1.21 × 10−4 K−1, respectively. The density of the blend increases by only 1.6% compared with LLDPE, whereas the tensile modulus increases by 56%, which is conducive to the blends to improve mechanical strength while preserving lightweight. The rheological tests show that the zero‐shear viscosity, storage modulus, and loss modulus of the LLDPE/COC blends do not change much compared with pristine LLDPE, maintaining their good melt processability at 160°C. The cyclic rigid structure of COC causes a decrease in CTE, and the increase in free volume between molecular chains is responsible for the reduced dielectric constant. The present work provides a promising route to the design and fabrication of melt‐reprocessable polymer composites with low dielectric constant and low thermal expansion.