Solubility analysis of nano particles, cellulose crystalline region and cellulose molecule, and the impact study of crystalline region on properties of cellulose insulating paper

For the first time, molecular dynamics simulation was used to analyse the solubility of five kinds of nanoparticles (SiO2, ZnO, Al2O3, Fe2O3, TiO2), cellulose crystalline region and cellulose molecules in this paper. The results show that the solubility of cellulose nanoparticles is positively related to the number of –OH groups on the surface of nanoparticles. The solubility between nano particles and cellulose molecules is smaller than that between cellulose crystalline region and cellulose molecules, which leads to the direct introduction of nano particles for physical modification reducing the solubility parameters of insulating paper. Through the analysis of mechanical properties, thermal stability and insulation properties, it is concluded that the comprehensive performance of the model with 70% crystalline region ratio is the best. The proportion of crystalline region further increased, the improvement of thermal stability is not obvious; the relative permittivity and the content of crystalline region are in line with the binomial fitting curve, and the constant term in the fitting curve is the relative permittivity of the amorphous region model; increasing the proportion of crystalline region is beneficial to improve the insulation performance of cellulose insulation paper.