Aging Inhibition Characteristics of Boron Nitride Nanosheets/Silicone Rubber Considering Interfacial Modification

ABSTRACT The insulation performance of power equipment is compromised by the aging effects of various physical fields, which can lead to failure. This study investigates the impact of interface modification on the aging behavior of composite materials. Polydopamine (PDA) is employed to modify the surface of boron nitride nanosheets (BNNS), enhancing their compatibility with silicone rubber (SIR). Thermal‐mechanical aging tests are performed to compare the aging properties of various materials. The experimental results demonstrate that PDA‐modified BNNS significantly enhance the DC electrical and mechanical properties of BNNS/SIR composites. Additionally, the PDA‐modified BNNS/SIR exhibits superior aging resistance under thermal aging conditions. Although there is a more pronounced decline in insulation properties under thermal‐mechanical aging, the PDA‐modified BNNS/SIR still demonstrates better aging resistance compared to the unmodified BNNS/SIR. This study provides insight into developing insulation composites with excellent aging inhibition characteristics.