Abstract
Nano-modified insulating paper, due to its outstanding performance, is regarded as a promising material in power system. Accordingly, in this study, three different kinds of polysilsesquioxane (POSS) nanoparticles were prepared from silsesquioxane monomers with octaaminophenyl, octaphenyl, or octamethyl substituents and used to prepare modified cellulose insulating paper. Doping with the POSS nanoparticles effectively improved the tensile strength of the insulating paper and reduced its relative dielectric constant. Specifically, doping with octaaminophenyl-POSS (OAPS) nanoparticles at 10 wt% showed the optimal modification effect. Accelerated thermal aging was carried out on this OAPS-modified insulating paper. Compared with those of the unmodified sample, the tensile strength of the modified sample was 16.87% higher and the relative dielectric constant was 24.63% lower after aging at 130 °C for 31 days. Molecular dynamics simulation was used to study the mechanism by which OAPS improves the tensile strength, dielectric properties, and thermal stability of cellulose insulating paper, and the results indicated that it forms hydrogen bonds with the cellulose chains, inhibiting their movement and inhibiting system polarizability.
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The datasets used or analysed during the current study are available from the corresponding author on reasonable request.
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This project was supported by the National Natural Science Foundation of China [Grant No. 51977179].
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All authors contributed to the study conception and design. The general framework, material preparation, data collection and analysis were performed by CT, CL, LY, ZW. The first draft of the manuscript was written by CL and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Li, C., Yang, L., Wang, Z. et al. Polysilsesquioxane-modified cellulose insulating paper with improved mechanical properties, dielectric properties and aging resistance. Cellulose 30, 5935–5947 (2023). https://doi.org/10.1007/s10570-023-05235-3
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DOI: https://doi.org/10.1007/s10570-023-05235-3