Mesoporous Nano-Silica Serves as the Degradation Inhibitor in Polymer Dielectrics.

Yang Yang,Jinliang He,Jun Hu

doi:10.1038/srep28749

Abstract

A new generation of nano-additives for robust high performance nanodielectrics is proposed. It is demonstrated for the first time that mesoporous material could act as “degradation inhibitor” for polymer dielectrics to sequestrate the electrical degradation products then restrain the electrical aging process especially under high temperature conditions, which is superior to the existing additives of nanodielectrics except further increasing the dielectric strength. Polyethylenimine (PEI) loaded nano-scaled mesoporous silica MCM-41 (nano-MS) is doped into the dielectric matrix to prepare the PP/MCM-41-PEI nanocomposites. PEI provides the amines to capture the electrical degradation products while the MCM-41 brackets afford large adsorption surface, bring down the activating temperature of the absorbent then enhance the absorptive capacity. The electrical aging tests confirm the contribution of the mesoporous structure to electrical aging resistance and FT-IR analysis of the electrical degraded regions demonstrates the chemical absorption especially under high temperature conditions. Take the experimental data as examples, extending the aging durability and dielectric strength of polymer dielectrics by 5 times and 16%, respectively, can have substantial commercial significance in energy storage, power electronics and power transmission areas.

Highlights

The performance of polymer dielectrics, determines the lifetime and stability of electrical and electronic devices, such as batteries[1], microelectronics[2], capacitors[3,4], and cables
The electrical tree tests under room temperature and high temperature conditions indicated the high electrical degradation resistance of the proposed “degradation inhibitor” and the chemical inhibition mechanisms were demonstrated by the local Fourier transform infrared spectroscopy (FT-IR) analysis of the degraded regions
Mesoporous silica MCM-41 nanoparticles were modified with PEI by wet impregnation method to improve the CO2 absorptivity and achieve stable chemical sequestration especially under high temperature conditions[31]

Summary

Introduction

The performance of polymer dielectrics, determines the lifetime and stability of electrical and electronic devices, such as batteries[1], microelectronics[2], capacitors[3,4], and cables. In this research, it is demonstrated for the first time that mesoporous material could act as “degradation inhibitor” for polymer dielectrics, i.e., additives that absorb and sequestrate the electrical degradation products restrain the electrical aging process except further increasing the dielectric strength which is superior to the existing additives of nanocomposites dielectrics (nanodielectrics). It is demonstrated for the first time that mesoporous material could act as “degradation inhibitor” for polymer dielectrics, i.e., additives that absorb and sequestrate the electrical degradation products restrain the electrical aging process except further increasing the dielectric strength which is superior to the existing additives of nanocomposites dielectrics (nanodielectrics) This new generation of nano-additives has been proposed here to replace the traditional solid nanoparticles for robust high performance polymer dielectrics and greatly improve the durability and stability of all electronic and electrical devices. Nano-sized mesoporous particles have been applied to improve the mechanical performance of polymers[27], and mesoporous structures have been recognized as outstanding electrode materials of electrochemical capacitors for energy-storage applications[28]

Methods

Results

Conclusion