Abstract
ABSTRACTWith the growing incidence of extreme climate and serious pollution, the capability to resist high‐voltage arc discharge has been considered as one of crucial performances for silicone rubber in the field of electrical power. Herein, to enhance the tracking and erosion resistance of addition‐cure liquid silicone rubber (ALSR), a kind of ureido‐attached vinyl MQ silicone resin [hydrolytic condensation products of monofunctional silane (M) and tetrafunctional silane (Q)] (U‐VMQ) was synthesized. The chemical structure of U‐VMQ was characterized by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance, and the effects of U‐VMQ on the mechanical properties, thermal stability, and tracking and erosion resistance of ALSR were investigated. The results showed that U‐VMQ was beneficial for the improvement of mechanical properties and thermal stability of ALSR. With 2 phr of U‐VMQ containing 2.5 wt % of vinyl content, the ALSR successfully passed the inclined plane tracking at 4.5 kV, and the electrical erosion rate was only 0.13%. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47360.
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