Suppression of electrical tree initiation in LDPE by additives of polycyclic compound
Suppression of electrical tree initiation in LDPE by additives of polycyclic compound
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DOI：
10.1109/tdei.2009.4784567
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发表时间：
2009-02
影响因子：
3.1
通讯作者：
Y. Yamano;M. Iizuka
中科院分区：
文献类型：
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作者：
Y. Yamano;M. Iizuka
测量了含有多环化合物添加剂的LDPE的树枝起始电压(TIV)，以研究该化合物在抑制树枝形成中的基本作用。使用了5种多环化合物作为添加剂：萘(NP)、菲(AN)、9，10-二溴菲(BrAN)、四苯(Te)和并五苯(Pn)。实验结果表明：含“AN”的LDPE的TIV约为不含添加剂的LDPE的3.5倍，而含“NP”、“Te”和“PN”的LDPE的TIV则无明显增加。在实验研究的基础上，讨论了TIV与化合物类型的关系的机理：测试材料的基本电学特性(导电电流、介电常数和介电常数)；测试材料由于化合物的激发而产生的紫外吸收光谱和由于去激发而从测试材料发出的发光光谱；添加剂在LDPE中的沉淀形状；以及用原子力显微镜观察测试材料的表面特征。测量和观察表明，含“AN”的LDPE具有最高的TIV主要是由两个因素造成的：片状晶体半导体析出物引起的电场驰豫，以及LDPE与电极界面处微空间的较浅深度。虽然添加剂的激发增加了TIV，但它不是TIV依赖性的重要因素，因为光谱表明，即使在添加了添加剂的材料中也有激发，这对TIV的增加没有影响。
Tree initiation voltages (TIVs) for LDPEs with additives of the polycyclic compounds were measured to investigate the fundamental role of the compound in the suppression of tree initiation. Five types of polycyclic compounds were used as additives: naphthalene (Np), anthracene (An), 9,10-dibromoanthracene (Br-An), tetracene (Te), and pentacene (Pn). The experimental results indicated that TIV depends on the typed of the compound: TIV for LDPE with "An" is about 3.5 times higher than that for LDPE without an additive; TIVs for "Np", "Te" and "Pn" are not significantly increased. The mechanism for the dependence of TIV on the type of the compound was discussed based on the following experimental investigations: the fundamental electric characteristics for the test materials (conduction current, permittivity and tan delta); the spectra for UV absorption of the test materials due to the excitation of the compound and the spectra for the luminescence emitted from the test materials due to the deexcitation; the shape of the precipitates of the additives in LDPE; and the surface feature for the test materials by AFM. The measurements and observations suggested that the highest TIV for LDPE with "An" is accomplished mainly by two factors: the relaxation of the electric field due to the semi-conductive precipitates of plate-shape crystal, and the shallower depth of micro-spaces located at the interface between LDPE and the electrode. Although the excitation of additive increases TIV, it is not a significant factor in the dependence of TIV, because the spectra indicated that the excitation occurs even in the materials with additive, which is ineffective to the increase in TIV.