To suppress space charge accumulation and minimize the antioxidant migration, polyethylene (PE) grafted with reactive hindered amine antioxidant MC prepared by melt radical grafting is investigated in this work. Fourier transform infrared spectroscopy is used to investigate the grafting reaction, which shows that the antioxidant MC is successfully introduced onto PEe Space charge distribution, DC conductivity, DC breakdown strength and thermally stimulated current are measured and the electronic structure is calculated from first-principles. The results show that PE grafted with antioxidant MC can effectively suppress space charge accumulation, reduce DC electrical conductivity and enhance DC breakdown strength. The polar functional groups of antioxidant MC anchored on PE macromolecular chain form immobile deep traps at the grafted MC sites, which can capture space charges and scatter charge carriers to reduce the amount, mobility and energy of charge carriers. Seen from the oxidative induction time of the specimens before and after acetone extraction, the level of retention of the grafted antioxidant MC are significantly higher than those of conventional antioxidant 300 and antioxidant 4020, which indicates that PE grafted with antioxidant MC has excellent long-term thermal oxidation stability.

中文翻译：

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将抗氧化剂接枝到聚乙烯上以改善直流介电和热老化性能


为了抑制空间电荷积累并最大程度地减少抗氧化剂的迁移，本文研究了通过熔融自由基接枝制备的反应性受阻胺抗氧化剂MC接枝聚乙烯（PE）。利用傅里叶变换红外光谱研究了接枝反应，结果表明抗氧化剂MC成功引入到PEe上。空间电荷分布、直流电导率、直流击穿强度和热刺激电流被测量，并根据第一原理计算了电子结构。结果表明，抗氧化剂MC接枝PE能有效抑制空间电荷积累，降低直流电导率，增强直流击穿强度。抗氧化剂MC的极性官能团锚定在PE大分子链上，在接枝的MC位点形成固定的深陷阱，可以捕获空间电荷并分散载流子，从而降低载流子的数量、迁移率和能量。从丙酮萃取前后试样的氧化诱导时间看，接枝抗氧剂MC的保留水平明显高于常规抗氧剂300和抗氧剂4020，这表明接枝抗氧剂MC的PE具有优异的长期稳定性。热氧化稳定性。