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[IEEE 2018 IEEE 2nd International Conference on Dielectrics (ICD) - Budapest (2018.7.1-2018.7.5)] 2018 IEEE 2nd International Conference on Dielectrics (ICD) - Effect of Interfacial Pressure on Electrical Tree between XLPE and Silicone Rubber
摘要： XLPE and silicone rubber (SIR) have been widely used in power cables and accessories for their excellent mechanical and electrical performance. However, the interface between them in accessories remains one of the weakest parts in the cable system. Electrical treeing is an important destructive factor for HV insulation structures, and it always leads to final breakdown. Therefore, it is essential to investigate the effects of interfacial pressure on electrical tree. In this paper, tests were carried out by pressing XLPE and SIR samples together under different interfacial pressures with a specific pressing device. AC voltage was applied on a pair of pin-plane electrodes placed at the interface. The pin-plane distance was 2 mm. The needle diameter was 0.25 mm and the tip curvature radius was (10±1) μm. Under different interfacial pressures, the voltages for electrical trees to initiate were recorded and statistically analyzed. Meanwhile, the tree morphology and breakdown channel were also captured by using a digital micro-imaging system. The results show that at a low interfacial pressure of 50 kPa, no electrical trees can be observed. Instead, discharge light can be seen at the interface. As the interfacial pressure increases, electrical tree begins to appear. It is found that at 75 kPa, electrical tree initiates and grows, which finally leads to a severe breakdown along the interface. While at pressures above 100 kPa, electrical tree tends to grow into SIR side, and the breakdown channel is slender, only observed in the SIR. Besides, the electrical tree initiation voltage increases with the increase of the interfacial pressure. It indicates that a high interfacial pressure can effectively delay the initiation of electrical trees, and for the two materials that constitute the interface, XLPE seems to have a better electrical treeing endurance than the SIR.
关键词： interfacial pressure,silicone rubber,electrical tree,XLPE cable accessory
更新于2025-09-23 15:22:29
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Marangoni interface self-assembly hybrid carbon nano-network for transparent conductive silicone rubber
摘要： Inspired by compact one-dimensional (1D) and two-dimensional (2D) hybrid network like natural thrombosis and beaver’s dam, we use Marangoni interface self-assembly hybrid 1D carbon nanotube and 2D graphene (CNT+G) as continuously connected nano-network onto the surface of silicone ink coated silicone rubber. Both good optical transmittance and electrical conductivity demonstrated in the transparent conductive silicone rubber (TCSR). Besides, the TCSR also have excellent mechanical adhesion between the (CNT+G) film and silicone ink coated silicone rubber.
关键词： Adhesion,Marangoni interface self-assembly,Graphene,CNT,Transparent conductive silicone rubber
更新于2025-09-23 15:22:29
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Fabrication of ultra-thin, hydrophobic and flexible electromagnetic wave absorber sheets based on nano-carbon/carbonyl iron in a polypyrrole/silicone rubber matrix
摘要： In this work, electromagnetic (EM) wave absorbing properties of polypyrrole/silicone rubber (PP-SI) filled nano-carbon and carbonyl iron (CI) nanocomposites have been investigated in the X-band. The PP-SR matrix was provided by the incorporation of polypyrrole and liquid silicone rubber in the ratio of 10:90. The PP-SR serves not only as a matrix but also promotes the flexibility and EM wave absorption of the nanocomposite sheets. In the present research, the chemical, morphology, thermal, wetting, absorption, and mechanical properties of the EM wave absorber sheets are investigated. The EM wave absorber sheet with 3 wt% nano-carbon and 37 wt% CI and a thickness of 1 mm, exhibits a minimum reflection loss around ?13 dB at 10.27 GHz. The absorber sheet with an elongation of 520% could be qualified as a superior elastic sheet. The specimen represents higher thermal stability compared with pure SR, and the contact angle of the sheet proved that their surface should be hydrophobic.
关键词： Flexible wave absorbers,Silicone rubber,Polypyrrole,EM wave absorber sheets
更新于2025-09-23 15:21:21
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Micro/nano-suction cup structure of silicone rubber fabricated by ArF excimer laser
摘要： Micro/nano-suction cups of silicone rubber, cylindrical swelling structures in micron size with a hole of hundreds nanometer diameter each, were fabricated by 193-nm ArF excimer laser-induced photodissociation of silicone rubber. To be periodically, silica glass microspheres of 2.5 μm diameter were aligned on silicone rubber via Al thin film during laser irradiation. The Al thin film underneath each microsphere was locally laser-ablated to enable a circular irradiation of subsequent laser pulses, then the exposed silicone rubber was photochemically swelled by the photodissociation of Si–O bonds of silicone rubber. Also, debris of aluminum surrounding the laser-ablated areas resulted in pushing microsphere up to adjust a focal point to the surface of silicone rubber to form a hole centered at each the swelled silicone. The fabricated structure showed clear superhydrophobic properties. Dependence of single pulse fluence of ArF excimer laser on the fabrication of micro/nano-suction cup structure was discussed, together with the variation of thickness of Al thin film from 10 to 100 nm. The use of the superhydrophobic silicone rubber we fabricated is expected as a kind of delivery system, toward holding a small object even in water by each micro/nano-suction cup structure.
关键词： Micro/nano-suction cup,Al thin film,ArF excimer laser,Superhydrophobic property,Silicone rubber
更新于2025-09-16 10:30:52
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Stretchable Parylene-C electrodes enabled by serpentine structures on arbitrary elastomers by silicone rubber adhesive
摘要： The delicate serpentine structures are widely used in high-performance stretchable electronics over the past decade. The metal interconnects encapsulated in biocompatible polymer Parylene-C film is a superior choice for long-term implantation in vivo, especially as neural interface to acquire electrophysiological signals or apply electrical stimulation. To avoid the physical contact damages from the neural tissues such as the brain or peripheral nerves, serpentine interconnects are utilized as stretchable electrodes and usually bonded to the soft elastomer substrate. The adhesion strength between the serpentine interconnects and the elastomer substrate becomes a considerable issue to ensure reliability and structural integrity. In this paper, the stretchable Parylene-C electrodes can be transfer printed onto arbitrary elastomer substrates by a thin layer of silicone rubber adhesive with low modulus for electrocorticogram (ECoG) recording. Mechanical simulation of serpentine structures consisting of same periodic arcs and different straight segments is investigated by uniaxial stretching. Then, the elastic stretchability of serpentine electrodes is further studied by simulation and experiments. After 5000 repetitive stretching cycles, the electrochemical impedance of microelectrodes remains in steady states. These results prove that the silicone rubber adhesive facilitates the interfacial bonding in the structure of stretchable electrodes as the compliant and reliable neural interface.
关键词： Serpentine structures,Electrocorticogram (ECoG) recording,Parylene-C,Silicone rubber adhesive,Stretchable electrodes
更新于2025-09-11 14:15:04
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Visualization of silica dispersion states in silicone rubber by fluorescent labeling
摘要： The internal dispersion structure of silica ?llers in polymer matrix is signi?cant for design and fabricating high-performance polymer composite. In order to explore the relationship between ?llers spatial dispersion states and mechanical properties, we use super?cial ?uorescent labeling to achieve ?llers visualization in polymer matrix with laser scanning confocal microscopy. Through the effect of ?uorescent silane coupling agent, the uniform red ?uorescence characteristics were shown on the silica surface. The 2D-planar and 3D-spatial dispersion states of silica ?llers in rubber matrix can be accurately observed with ?uorescence imaging technology. The results by Avizo software statistics show that high-content silica ?llers in composite tend to undergo dissociation of aggregates. These dissociated small volume aggregates which facilitate the interaction between particles and rubber matrix to dissipate mechanical energy effectively and rapidly improve rubber toughness. This successful visualization method opens a new avenue in spatial dispersion description of ?llers aggregates in organic–inorganic composite.
关键词： silicone rubber,fluorescent labeling,silica dispersion,mechanical properties,3D visualization
更新于2025-09-10 09:29:36
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Fabrication of the Fresnel lens with liquid silicone rubber using rapid injection mold
摘要： Liquid silicone rubber (LSR) parts are used in aerospace application due to their stable properties. In order to compress time to market for a new product, it is necessary to develop an injection mold for LSR injection mold swiftly and effectively. Rapid tooling (RT) technology can reduce time to market compared to the conventional machining methods. The aluminum-filled epoxy resin mold is capable of replacing the conventional steel mold for small batch production using injection molding. In this study, an injection mold with heating element was developed using RT technology for LSR injection molding. It was found that the replication rate for the average microgroove depth and width of the Al-filled epoxy resin mold is about 90.5% and 98.9%, respectively. The transcription rate for the average microgroove depth and width of the LSR molded parts is about 91.5% and 99.2%, respectively. The variations in dimension of microgroove depth and width of the LSR molded parts can be controlled within ± 1 μm. The average surface roughness of the Al-filled epoxy resin mold was only increased by about 12.5 nm after 200 test runs of LSR injection molding.
关键词： Liquid silicone rubber injection molding,Aluminum-filled epoxy resin,Fresnel lens,Replication rate,Transcription rate
更新于2025-09-09 09:28:46