caused disintegration of polyimide solid insulation by a Kapton-type molecular model

under electric field.From the atomic scale

the cleavage and construct of chemical bonds are analyzed with the formation mechanism of characteristic products.While

the influence of electric field effecting on broken of chemical bonds is investigated by the perspective of atomic electronic structure.The external electric field intensity is 4

4.5

5

5.5

or 6×10-3 V/nm for different simulations respectively.The result indicates that electric field intensities effects on molecular cracking reaction speed and balance state and the effect cause large number of single element free from bond order;the cleavage of polar C-N bonds in imide ring

because of the torque of C-N is strengthened by atomic electronic structure redistribution

initiate the disintegration of polyimide.The fracture of benzene ring under electric field shows a relationship of generation of C2 H2.As an insulation materials

disintegration of polyimide leads to the solid insulation failure of electrical installations.