研究目的
To propose an approach to emphasize the dielectric response of the interphase of a PP-SiO2 nanocomposite and how this frequency dependent behavior of the dielectric property varies with the temperature.
研究成果
The proposed approach of finding the optimal scale factors to adjust the linear mixture model can be useful to estimate the frequency dependent permittivity of the interphase of nanodielectrics by solving inverse numerical problems. The dielectric response of the interphase dominates the dielectric response of the whole nanodielectric.
研究不足
The study is limited by the idealizations and assumptions made in the numerical model, such as the linearity and isotropy of materials, and the absence of permanent polarization. Future developments should account for non-linear dielectric materials.
1：Experimental Design and Method Selection:
The study uses dielectric spectroscopy and a numerical model to estimate the frequency dependence of the interphase dielectric behavior.
2：Sample Selection and Data Sources:
PP-SiO2 nanodielectrics containing 5 wt% SiO2 particles of about 15 nm were used.
3：List of Experimental Equipment and Materials:
A Novocontrol ALPHA-A Analyzer in combination with an Active Sample Cell ZGS was used for the measurements.
4：Experimental Procedures and Operational Workflow:
Measurements were performed over the frequency range 10-2 – 106 Hz, with a step-like decreasing of the temperature from 350 K to 300 K with a step-size of 10 K.
5：Data Analysis Methods:
The numerical model was described in COMSOL Multiphysics, in an EQS regime, all materials being linear, isotropic, with no permanent polarization.
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