Abstract
Polymethylsilsesquioxane (PMSQ) nanoparticles with mass percentages of 0, 2.5, 5.0, 7.2, 9.4 wt %, respectively, were constructed by molecular dynamics methods in this paper. Composite molecular models were established using PMSQ and MPIA (poly-metaphenylene isophthalamide) fiber. The influence of different PMSQ contents on the thermal stability of meta-aramid insulation paper was analyzed from the parameters of mechanical property, interaction energy, and mean square displacement. The results showed that the trend of mechanical properties decreased with the increase of PMSQ content. When the PMSQ content was 2.5 wt %, the mechanical properties of the composited model were the best, which was about 24% higher than that of the unmodified model. From an intermolecular bonding and nonbonding point of view, the energy parameters of composite model with the 2.5 wt % content was better than those of the composite model with other contents. Therefore, it is considered that MPIA can interact better with the 2.5 wt % content PMSQ composite model. When the PMSQ content is 2.5 wt %, the overall chain movement in the composite model is slower than that of the unmodified model, which can effectively inhibit the diffusion movement of the MPIA chain. In general, the thermal stability of composite molecular models MPIA and PMSQ (2.5 wt %) was better improved.
Highlights
With the continuous improvement of the voltage level of transmission lines in China, higher quality requirements have been imposed on the insulation performance of internal transformer components
Cellulose insulation paper has been widely used in the insulation of power transformers due to its good insulation and mechanical properties, easy harvesting, simple manufacturing process, and electrical insulation system with good transformer-oil performance [1,2]
The Poisson’s ratio of the modified model with 2.5 wt % content is the smallest the Poisson’s it is considered that the interaction between the deformation of in the five composite models, and it is considered that the interaction between the deformation materials in different directions is relatively small
Summary
With the continuous improvement of the voltage level of transmission lines in China, higher quality requirements have been imposed on the insulation performance of internal transformer components. Its monomers are composite of organic and inorganic [3,4,5,6] This special composition of molecular structure gives it many excellent properties, such as highand low-temperature resistance, electrical insulation, hydrophobicity, flame retardancy, nontoxicity, corrosion, and physiology. POSS can improve the thermal stability [4,6,9,10,11,12], mechanical properties [4,6,12,13,14], hydrophobicity [15,16,17], flame retardancy [18,19,20], and dielectric properties [21,22,23] of the polymer at the molecular level; this modification method has been widely studied by researchers. In order to provide theoretical support for the further study of nanomodified insulation paper, the intrinsic mechanism of improving the thermal stability of meta-aramid fiber insulation paper by doping polymethylsilsesquioxane was explored
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