With the advancement of computational technology

molecular simulation has become an increasingly pivotal tool in the study of nanomodification for insulation materials. Existing research on the modification effects of nanoparticles on cellulose paper has primarily focused on the amorphous regions

while the modification mechanism within the crystalline regions remains underexplored. To investigate the effect of nano-SiO2 on the crystalline regions of cellulose paper under electro-thermal coupling

this study established a SiO2/cellulose crystalline region model using molecular dynamics simulations. The model was subjected to both thermal aging and combined electro-thermal aging to determine the evolution of its microscopic parameters before and after modification. The following conclusions are drawn: The thermal

mechanical

and dielectric properties of the cellulose crystalline regions are effectively enhanced by the addition of SiO2 nanoparticles. Under combined electro-thermal aging at 423 K

the Young’s modulus is increased by 13.47%

the dielectric constant is reduced by 5.44%

and the electrical strength is enhanced by 8.16%. Furthermore

the interactions between molecular chains are strengthened

and hydrogen bond fluctuations are significantly reduced

leading to a more stable structure and thus ensuring greater safety and reliability in transformer operations. These findings provide supplementary evidence for the modification mechanism of nanomodification technology applied to cellulose paper.