实验结果说明，拉伸前后的这类共聚物薄膜均是极性材料，即充电极化后的材料内部同时存在取向偶极子和俘获空间电荷。
Experimental results point out that the said copolymer electret film is a polar material, i. e. there exist both oriented dipoles and deposited space charges in the film after charging.
慢极化弛豫机构来源于空间电荷和缺陷的扩散，宏观表现为吸收电流，用时域微分谱可解释这一结果。
The mechanisms of slow polarize relaxation come from the diffuse of space charges and traps, it is absorption current in the macroscopic.
接地放电后，极化电荷及表层电荷释放，仍存在水树枝内的空间电荷即为残留电荷；
After grounding, polarization charges and shallow charges will be released. The space charges still existing in water tree are called residual charge.
接地放电后，极化电荷及表层电荷释放，仍存在水树枝内的空间电荷即为残留电荷；
After grounding, polarization charges and shallow charges will be released. The space charges still existing in water tree are called residual charge.
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