ISBN: 978-1-4799-8903-4 2015 IEEE 11th International Conference on the Properties and Applications of Dielectric Materials (ICPADM)
Simulations of Effective Permittivity and Polarization Properties of Polyethylene Nanodielectrics Weiwang Wang and Shengtao Li* State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an, Shaanxi, 710049, China *Email:
[email protected] reductions were also obtained in Epoxy/silica and Epoxy/MgO nanocomposites at low nanoparticle loadings [6, 7]. It can be concluded that the permittivity exists a nonlinear variation with nanoparticle loading. In detail, the effective permittivity of nanocomposites initially decreases and then increase with increasing nanoparticle loading, which is different with the linear variation in microcomposites and is very difficult to be explained by effective medium theories [8]. It is generally accepted that the reduction of permittivity is ascribed to the restriction of molecular chain, side groups and some radical groups in interfacial region. In addition, the increase of free volume caused by the interface also contributes to the reduction of permittivity [9].
Abstract—Many papers reported that the effective permittivity of nanodielectrics decreased slightly by incorporating of small amount of nanoparticles, and increased at high nanoparticle loadings. The reduction of permittivity was close related to the molecular chains movements, chemical and physical interactions and polarization effects in interfacial region. This paper simulated the effective permittivity and polarization properties of LDPE/Al2O3 nanodielectrics based on the revised interphase power law (IPL) model. The results indicated that the IPL model is well fit to the experimental results of reduced permittivity in LDPE/Al2O3 nanocomposites at low loadings (
