Open AccessEffect of Thermal Aging on Breakdown Strength of Epdm Rubber
Author(s) -
Ruocheng Wang,
Yanan He,
Zhao Wang,
Hongwei Kang,
Jiawei Ma,
Haiyun Jin
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/768/6/062091
Subject(s) - materials science , thermogravimetric analysis , composite material , fourier transform infrared spectroscopy , accelerated aging , thermal stability , ethylene propylene rubber , thermal decomposition , epdm rubber , natural rubber , vulcanization , monomer , chemical engineering , polymer , chemistry , organic chemistry , engineering , copolymer
This paper takes the Ethylene Propylene Diene Monomer (EPDM) insulation layer of 220kV integral prefabricated cable joint as the research object, performs accelerated thermal aging experiments at 130°C, 145°C, and 160°C, and then conducted Fourier Transform Infrared spectroscopy (FTIR), Thermogravimetric Analysis (TGA) and power frequency breakdown strength test successively. The experimental results show that thermal aging results in long molecular chain degradation, bond breaking and oxidation of EPDM.The initial decomposition temperature decreases gradually with the aging time and the thermal stability decreases gradually under the action of thermal aging. The breakdown field strength decreased by 13.3%, 21.2% and 22.5% respectively at the end of thermal aging, and the decline rate increased with the aging temperature. The main reasons for the decrease of breakdown strength are the precipitation of crosslinking agent, the breaking down of molecular chain and the generation of oxygen-containing groups.