Abstract—

This paper presents the results into the study of electret properties of composite materials based on ultrahigh molecular weight polyethylene (UHMWPE) and nano-dispersed amorphous silica filler α-SiO₂ (aerosil) depending on the volume content of silicon dioxide and the absorbed dose D γ-irradiation at room temperature using the method of thermally stimulated depolarization (TSD). It was found that introducing up to 5% of spherical nanoparticles of amorphous α-SiO₂ silicon dioxide with a diameter of 20 nm in UHMWPE first increases and then reduces the electret characteristics of the composites. UHMWPE + 1% α-SiO₂ has the maximum value of the electret potential difference and the stability of the electret state. It was shown that preliminary γ-irradiation affects the electret properties of the studied composite material, which is associated with its increased electrical conductivity and a high charge relaxation rate. The observed increase in the initial surface charge density σ_el of UHMWPE compositions is associated with the presence of energy traps of injected charge carriers. Based on the analyzing the spectra of TSD, it was shown that the thermal stability of electrets from the UHMWPE composite + 1% α-SiO₂ is improved. The nature of the TSD current of pre-γ-irradiated films once again proves that, after γ-irradiation, the injected charges from the corona zone mainly accumulate in the near-surface layers of the irradiated samples. The results of TSD suggest that the relaxation of the electret state in the materials under study occurs due to the bulk conductivity.

中文翻译：

---

UHMWPE +α-SiO2纳米复合材料的电荷态特征

摘要-

本文呈现的结果成复合材料的驻极体特性的基础上的超高分子量聚乙烯（UHMWPE）和研究纳米分散的无定形二氧化硅填料α-的SiO ₂取决于二氧化硅的体积含量和吸收剂量d（AEROSIL）使用热激发去极化（TSD）方法在室温下进行γ辐射。结果发现，引入到无定形α-的SiO的球形纳米颗粒的5％₂二氧化硅的直径为在UHMWPE先增大20纳米，然后降低了复合材料的电介体特性。UHMWPE + 1％α-的SiO ₂具有驻极体电势差的最大值和驻极体状态的稳定性。结果表明，初步的γ辐射会影响所研究复合材料的驻极体性能，这与其电导率的提高和高电荷弛豫率有关。在初始表面电荷密度σ所观察到的增加_EL UHMWPE组合物与注入载流子的能量陷阱的存在相关联。基于所述分析TSD的光谱的测定结果表明，驻极体的从UHMWPE复合+ 1％α-的SiO的热稳定性₂得到改善。预γ辐照膜的TSD电流的性质再次证明，在γ辐照后，来自电晕区的注入电荷主要聚集在被辐照样品的近表层。TSD的结果表明，在研究的材料中，驻极体状态的弛豫是由于体积电导率引起的。