Thermal stability of polyphenylsilsesquioxane‐modified meta‐aramid insulation paper

Tang, Chao; Zheng, Weitao; Wang, Lihan

doi:10.1049/hve.2019.0266

Cited by 37 publications

(17 citation statements)

References 30 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The periodic boundary model was adopted in this calculation, and the size of the supercell is 10.886 Å × 11.328 Å × 29.353 Å. In order to avoid the interaction between adjacent cells induced by periodic boundary condition, the vacuum layer above the surface is about 21 Å [40,41]. The generalized gradient approximation (GGA) with the Perdew-Burke-Emzerhof (PBE) is employed to calculate the exchangecorrelation energy [42,43].…”

Section: Methodsmentioning

confidence: 99%

Influence of Pd Clusters Doping on Gas Sensing Properties of TiO₂(101) Nanotubes to SF₆ Decomposition Products

Chen

Tao

et al. 2020

IEEE Access

View full text Add to dashboard Cite

Detection and analysis of sulfur hexafluoride (SF6) decomposition components is one of the most used methods to realize online monitoring of gas insulated switchgear (GIS) faults. In this paper, Pd3doped anatase TiO2(101) surface was constructed, and studied about its geometric and electronic properties to characteristic SF6 decomposition products: SOF2 and SO2F2 based on DFT calculations. Comparing with intrinsic TiO2(101), the conductivity of Pd3-TiO2(101) surface decreases dramatically. Studies on adsorption energy, charge transfer, and adsorption distance show that Pd3-TiO2(101) shows strong chemisorption to SOF2 and SO2F2 molecules. Based on density of states and molecular orbital theory analysis, it is found that the adsorption of SOF2 and SO2F2 can dramatically change the conductivity in different degrees. As a result, the Pd3-TiO2(101) surface exhibits high gas sensitivity and selectivity to SOF2 and SO2F2 molecules. Our calculations would be meaningful for the development of new sensing materials for SF6 decomposition components detection.

show abstract

Section: Methodsmentioning

confidence: 99%

Influence of Pd Clusters Doping on Gas Sensing Properties of TiO₂(101) Nanotubes to SF₆ Decomposition Products

Chen

Tao

et al. 2020

IEEE Access

View full text Add to dashboard Cite

show abstract

“…PMIA is a polymer with a molecular weight of 60,000–90,000 formed by spatial intricate polymerization of Iso-phthalic Acid and m-Phenylenediamine monomers [ 15 ]. The molecular model of PMIA monomer is shown in Figure 1 .…”

Section: Modeling and Dynamic Optimizationmentioning

confidence: 99%

Molecular Dynamics Study of the Influence of Nano SiO2 on the Thermodynamic Properties of PMIA Composites

Liu

Fan

et al. 2022

Polymers

View full text Add to dashboard Cite

The poly-m-phenyleneisophthalamide (PMIA) is widely used in the electrical field due to its numerous favorable characteristics, but its poor thermal conductivity limits its application. In this study, PMIA was modified with nano-silica (SiO2) to improve its thermal and mechanical properties. Using iso-phthalic acid and m-phenylenediamine as monomers, the changes in the thermodynamic properties and microstructure parameters of SiO2-modified PMIA were analyzed using molecular dynamics before and after modification in the temperature range of 250~450 K. It was found that adding SiO2 improves the Young’s modulus and Shear modulus of PMIA, and the mechanical properties of PMIA, and SiO2/PMIA composites deteriorate with increasing temperature, but the mechanical properties of SiO2/PMIA composites are always better than those of pure PMIA in the temperature range of electrical equipment. Meanwhile, after doping SiO2 with the radius of 8 Å, the glass transition temperature of PMIA increases by 27.11 K, and its thermal conductivity increases from 0.249 W m−1 K−1 to 0.396 W m−1 K−1. When SiO2 is added to PMIA, the thermal expansion coefficient of PMIA will decrease in both glass and rubber states, and its thermal stability will improve. In terms of microstructure parameters, the free volume distribution of the SiO2/PMIA model is less easily dispersed than that of the PMIA model, indicating that the addition of SiO2 can improve the related properties of PMIA by hindering the movement of molecular chains.

show abstract

“…Therefore, it is of great importance to study the glass-transition characteristics of cellulose at high temperature to improve its thermal stability. When studying the glass-transition temperatures of polymers, the most commonly used and reliable method is the specific volume-temperature curve method [23][24][25][26]. The specific volume is the reciprocal of the density, and it is the most commonly used physical quantity in determination of the glass-transition temperature.…”

Section: Glass-transition Temperaturementioning

confidence: 99%

Molecular Simulation of Improved Mechanical Properties and Thermal Stability of Insulation Paper Cellulose by Modification with Silane-Coupling-Agent-Grafted Nano-SiO2

Zhang

Zhou

et al. 2021

Processes

Self Cite

View full text Add to dashboard Cite

Cellulose is an important part of transformer insulation paper. Thermal aging of cellulose occurs in long-term operation of transformers, which deteriorates the mechanical properties and thermal stability of cellulose, resulting in a decrease in the transformer life. Therefore, improvement of the mechanical properties and thermal stability of cellulose has become a research hotspot. In this study, the effects of different silane coupling agents on the mechanical properties and thermal stability of modified cellulose were studied. The simulation results showed that the mechanical parameters of cellulose are only slightly improved by KH560 (γ-glycidyl ether oxypropyl trimethoxysilane) and KH570 (γ-methylacrylloxy propyl trimethoxy silane) modified nano-SiO2, while the mechanical parameters of cellulose are greatly improved by KH550 (γ-aminopropyl triethoxy silane) and KH792 (N-(2-aminoethyl)-3-amino propyl trimethoxy silane) modified nano-SiO2. The glass-transition temperature of the composite model is 24 K higher than that of the unmodified model. The mechanism of the change of the glass-transition temperature was analyzed from the point of view of free-volume theory. The main reason for the change of the glass-transition temperature is that the free volume abruptly changes, which increases the space for movement of the cellulose chain and accelerates the whole movement of the molecular chain. Therefore, modifying cellulose with KH792-modified nano-SiO2 can significantly enhance the thermal stability of cellulose.

show abstract

Thermal stability of polyphenylsilsesquioxane‐modified meta‐aramid insulation paper

Cited by 37 publications

References 30 publications

Influence of Pd Clusters Doping on Gas Sensing Properties of TiO₂(101) Nanotubes to SF₆ Decomposition Products

Influence of Pd Clusters Doping on Gas Sensing Properties of TiO₂(101) Nanotubes to SF₆ Decomposition Products

Molecular Dynamics Study of the Influence of Nano SiO2 on the Thermodynamic Properties of PMIA Composites

Molecular Simulation of Improved Mechanical Properties and Thermal Stability of Insulation Paper Cellulose by Modification with Silane-Coupling-Agent-Grafted Nano-SiO2

Contact Info

Product

Resources

About