“…20–23 In addition, the healing agent contained in the microcapsules is released passively after the rupture of the shell triggered by the external stimulation, which causes problems such as failed shell cracking, delayed release, and low healing rates. 24–29 Finally, the microcapsule shell, which serves as a container, dramatically deteriorates the insulating characteristics of the matrix. 30 In particular, when the healing agent flows out of the shell, the residual shell introduces new defects into the matrix, 14 which causes fresh electric-tree damage.…”