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Lamellae-controlled electrical properties of polyethylene - morphology, oxidation and effects of antioxidant on the DC conductivity

机译：聚乙烯 - 形态，抗氧化剂对直流电导率的形态学，氧化和抗氧化作用的薄膜控制的电学性能

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Destruction of the spherulite structure in low-density polyethylene (LDPE) is shown to result in a more insulating material at low temperatures, while the reverse effect is observed at high temperatures. On average, the change in morphology reduced the conductivity by a factor of 4, but this morphology-related decrease in conductivity was relatively small compared with the conductivity drop of more than 2 decades that was observed after slight oxidation of the LDPE (at 25 degrees C and 30 kV mm(-1)). The conductivity of LDPE was measured at different temperatures (25-60 degrees C) and at different electrical field strengths (3.3-30 kV mm(-1)) for multiple samples with a total crystalline content of 51 wt%. The transformation from a 5 mu m coherent structure of spherulites in the LDPE to an evenly dispersed random lamellar phase (with retained crystallinity) was achieved by extrusion melt processing. The addition of 50 ppm commercial phenolic antioxidant to the LDPE matrix (e.g. for the long-term use of polyethylene in high voltage direct current (HVDC) cables) gave a conductivity ca. 3 times higher than that of the same material without antioxidants at 60 degrees C (the operating temperature for the cables). For larger amounts of antioxidant up to 1000 ppm, the DC conductivity remained stable at ca. 1 x 10(-14) S m(-1). Finite element modeling (FEM) simulations were carried out to model the phenomena observed, and the results suggested that the higher conductivity of the spherulite-containing LDPE stems from the displacement and increased presence of polymeric irregularities (formed during crystallization) in the border regions of the spherulite structures.
机译：在低密度聚乙烯（LDPE）的球晶结构的破坏显示出导致在低温下的更绝缘材料，而相反的效果在高温下观察到的。平均来说，在形态上的变化由4倍降低导电性，但与LDPE的轻微氧化后观察到（在25度以上20年的电导率下降相比，导电性本形态相关的下降是相对小的C和30千伏毫米（-1））。 LDPE的电导率在不同温度下（25-60℃），并在不同的电场强度（3.3-30千伏毫米（-1）），用于多个样品与51重量％的总晶体含量进行测定。从5微米的转化中的M LDPE到均匀分散的随机层状相（具有保持结晶度）球晶的相干结构通过挤出熔融加工来实现的。加入50ppm的商业酚类抗氧化剂的LDPE基质（例如，用于在高压直流长期使用聚乙烯（HVDC）电缆），得到的导电率约在60℃下（在操作温度为电缆）3倍比没有抗氧化剂的相同材料的高。对于较大的量的抗氧化剂高达1000 ppm，则DC电导率在约保持稳定1×10（-14）S M（-1）。有限元建模（FEM）模拟进行了建模的现象观察，结果表明，该含球晶-LDPE的更高的电导率从位移茎和在边界区域增加聚合物的不规则性的存在（结晶过程中形成的）该球状结构。

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  • 来源
    《RSC Advances》 |2020年第8期|共12页
  • 作者

    Karlsson Mattias E.; Xu Xiangdong; Hillborg Henrik; Strom Valter; Hedenqvist Mikael S.; Nilsson Fritjof; Olsson Richard T.;

  • 作者单位

    KTH Royal Inst Technol Dept Fibre &

    Polymer Technol Sch Engn Sci Chem Biotechnol &

    Hlth SE-10044 Stockholm Sweden;

    Chalmers Univ Technol Dept Mat &

    Mfg Technol SE-41296 Gothenburg Sweden;

    ABB Power Grids Res S-72178 Vasteras Sweden;

    KTH Royal Inst Technol Mat Sci &

    Engn Sch Ind Engn &

    Management SE-10044 Stockholm Sweden;

    KTH Royal Inst Technol Dept Fibre &

    Polymer Technol Sch Engn Sci Chem Biotechnol &

    Hlth SE-10044 Stockholm Sweden;

    KTH Royal Inst Technol Dept Fibre &

    Polymer Technol Sch Engn Sci Chem Biotechnol &

    Hlth SE-10044 Stockholm Sweden;

    KTH Royal Inst Technol Dept Fibre &

    Polymer Technol Sch Engn Sci Chem Biotechnol &

    Hlth SE-10044 Stockholm Sweden;

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