Water-Tree Resistant Characteristics of Crosslinker-Modified-SiO2/XLPE Nanocomposites

Zhang, Yongqi; Wang, Xuan; Yu, Ping-Lan; Sun, Wei‐Feng

doi:10.3390/ma14061398

Cited by 5 publications

(5 citation statements)

References 29 publications

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“…Other interfacial chemistries in Figure S3a (Supporting Information), such as thiol/double bond click reaction and thiol/epoxy click reaction, have been well characterized, which are helpful for improving the interfacial adhesion. [31,32] Also, in addition to silane treatment of substrate, we also provided three surface modification methods including surface primer, polydopamine (PDA)-coating, and surface initiation to expand the universality of the strategy (Figure S3b, Supporting Information). Taking PDMS as an example, the surface primer method can cure the PDMS precursor with active functional groups (such as amino group, sulfhydryl group, and double bond) on the substrate in situ to obtain the surface with active functional groups.…”

Section: Materials Characterizationmentioning

confidence: 99%

Interfacial Click Chemistry Enabled Strong Adhesion toward Ultra‐Durable Crack‐Based Flexible Strain Sensors

Shi

Zhu

et al. 2023

Adv Funct Materials

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Flexible strain sensors, particularly crack-based ones, have evoked great interests in recent years because of their excellent sensitivity and promising applications in health monitoring and human-machine interactions. However, the poor durability originated from the weak interfacial bonding between fragile conductive layer and stretchable elastic substrate makes it difficult to meet the needs of practical use. Herein, a strategy enabled by interfacial click chemistry is proposed for effectively enhancing the adhesion strength (τ), thereby improving the durability of the flexible strain sensors. It is found that the strong interfacial adhesion can bear larger cyclic shear force, effectively suppress the crack propagation of the conductive layer, and prevent the conductive layer from peeling off, thus stabilize the conductive path under specific strain during cyclic test, resulting in excellent durability. Moreover, the device durability (number of stable cycles, i.e., C n ) is found to linearly depend on τ, based on which "durability-adhesion coefficient (C DA )" is defined. So far it is known, this is the first report to quantitatively establish the relationship between interfacial adhesion strength and cycling durability of crack-based strain sensors, providing a new viewpoint for future design of flexible devices with high reliability.

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Section: Materials Characterizationmentioning

confidence: 99%

Interfacial Click Chemistry Enabled Strong Adhesion toward Ultra‐Durable Crack‐Based Flexible Strain Sensors

Shi

Zhu

et al. 2023

Adv Funct Materials

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“…Usually, water trees do not cause an insulation breakdown, but these can create PD or electrical trees, which are recognized as the primary factors contributing to insulation failure . To overcome this problem, researchers tried to improve the manufacturing technology by adding water tree retardant material and developing semiconducting materials with higher purity. − These methods helped by delaying the formation of electrical trees but could not eliminate the whole problem. Later, it was found that not only the traces of water trees can initiate the formation of electrical trees but the presence of protrusion or roughness of the surface of the insulating polymers can also initiate the formation of electrical trees. − Moreover, at the interphase of different materials during the manufacturing of power cables, the formation of voids or cavities cannot be entirely avoided.…”

Section: Introductionmentioning

confidence: 99%

“… 7 To overcome this problem, researchers tried to improve the manufacturing technology by adding water tree retardant material and developing semiconducting materials with higher purity. 8 − 10 These methods helped by delaying the formation of electrical trees but could not eliminate the whole problem. Later, it was found that not only the traces of water trees can initiate the formation of electrical trees but the presence of protrusion or roughness of the surface of the insulating polymers can also initiate the formation of electrical trees.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Impact of Hardness on Dielectric Breakdown Characteristics of Polyurethane

Samad,

Siew,

Given

et al. 2024

ACS Omega

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Polymeric materials play a vital role in high-voltage insulation, but their insulating properties can deteriorate over time, leading to insulation failures. The presence of voids resulting from manufacturing defects or external stresses can create a highly divergent field, further contributing to this issue. However, certain polymers, such as polyurethane (PU), possess self-healing properties that enable them to repair these voids and restore a uniform electric field distribution, thereby ensuring the reliability of the insulation. Surprisingly, the potential of PU as an insulating material in high-voltage applications remains unexplored. However, the self-healing capability of PU decreases with an increase in the hardness of the material. Therefore, in this study, the dielectric breakdown properties of PU with different levels of hardness, rated on the Shore scale as 40°(soft), 70°(medium), and 90°(hard), were investigated. The AC and DC dielectric breakdown characteristics of these PU variants and dielectric spectra were examined. Additionally, the study explores the relationship between the dielectric properties and the hardness of the material. Our findings revealed that the dielectric breakdown strength of PU increases as the material's hardness is increased under both AC and DC electric stress. However, this may come at the cost of reduced self-healing capabilities of PU. Therefore, there is a need to balance the hardness of the material with its ability to recover from breakdown events. The findings from this study can be useful for researchers and engineers, as they offer valuable insights into the dielectric properties of PU at various hardness levels.

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“…Therefore, it is necessary to use coupling agents to organically modify the surface of the nano-zeolite and improve its dispersion performance in the polyethylene matrix. At the same time, other functional groups, such as groups improving thermal conductivity or auxiliary crosslinking agents, can be introduced by grafting to make the nano-zeolite more evenly dispersed and fixed in the XLPE crosslinking network [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Space Charge Properties of Functionalized Zeolite/Crosslinked Polyethylene Composites with High Thermal Conductivity

Han,

Dai,

Zhao

et al. 2023

Polymers

Self Cite

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Nanocomposite doping is an effective method to improve the dielectric properties of polyethylene. Meanwhile, the introduction of thermal conductivity groups in crosslinked polyethylene (XLPE) is also an effective way to improve the thermal conductivity. Nano-zeolite is an inorganic material with a porous structure that can be doped into polyethylene to improve the insulation performance. In this paper, hyperbranched polyarylamide (HBP) with a high thermal conductivity and an auxiliary crosslinking agent (TAIC) was grafted on the surface of ZSM-5 nano-zeolite successively to obtain functionalized nano-zeolite (TAICS-ZSM-5-HBP) (the “S” in TAICS means plural). The prepared functionalized nano-zeolite was doped in polyethylene and grafted under a thermal crosslinking reaction to prepare nanocomposites (XLPE/TAICS-ZSM-5-HBP). The structural characterization showed that the nanocomposite was successfully prepared and that the nanoparticles were uniformly dispersed in the polyethylene matrix. The space charge of the TAICS-ZSM-5-HBP 5wt% nanocomposite under a high electric field was obviously inhibited. The space charge short-circuit test showed that the porous structure of the nano-zeolite introduced more deep traps, which made the trapped charge difficult to break off, hindering the charge injection. The introduction of TAICS-ZSM-5-HBP particles can greatly improve the thermal conductivity of nanocomposites. The thermal conductivity of the XLPE/5wt% and XLPE/7wt% TAICS-ZSM-5-HBP nanocomposites increased by 42.21% and 69.59% compared to that of XLPE at 20 °C, and by 34.27% and 62.83% at 80 °C.

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Water-Tree Resistant Characteristics of Crosslinker-Modified-SiO2/XLPE Nanocomposites

Cited by 5 publications

References 29 publications

Interfacial Click Chemistry Enabled Strong Adhesion toward Ultra‐Durable Crack‐Based Flexible Strain Sensors

Interfacial Click Chemistry Enabled Strong Adhesion toward Ultra‐Durable Crack‐Based Flexible Strain Sensors

Investigating the Impact of Hardness on Dielectric Breakdown Characteristics of Polyurethane

Preparation and Space Charge Properties of Functionalized Zeolite/Crosslinked Polyethylene Composites with High Thermal Conductivity

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