High density polyethylene filled with condutuctive carbon black was prepared by conventional meltmixing method. The effect of unidirectional pressure on the conductivity was studied. Wide angle X-ray diffraction （ WA...High density polyethylene filled with condutuctive carbon black was prepared by conventional meltmixing method. The effect of unidirectional pressure on the conductivity was studied. Wide angle X-ray diffraction （ WAXD ） was used to slum： the influence of pressure on the aggregate structure of the polymer filled with carbon black （CB） fillers. A model on the basis of the formation and destruction of conductive networks was proposed to explain the change in the conductivity with the application of pressure.展开更多
为研究低剂量炭黑(carbon black,CB)对低密度聚乙烯(low density polyethylene,LDPE)空间电荷和电导特性的影响,该文采用熔融共混法制备了CB/LDPE复合介质,利用电声脉冲法测试LDPE和CB/LDPE复合介质的空间电荷分布,并在不同温度下测试...为研究低剂量炭黑(carbon black,CB)对低密度聚乙烯(low density polyethylene,LDPE)空间电荷和电导特性的影响,该文采用熔融共混法制备了CB/LDPE复合介质,利用电声脉冲法测试LDPE和CB/LDPE复合介质的空间电荷分布,并在不同温度下测试了其直流电导特性。采用量子化学分子动力学模拟等手段对CB/LDPE复合介质的陷阱特性进行研究。另外采用多物理场耦合软件COMSOL Multiphysics分别仿真研究了以LDPE和CB/LDPE复合介质为绝缘的直流电缆绝缘层内电场分布。结果表明:CB/LDPE复合介质具有较强的空间电荷抑制能力、较低的电导率和电导温度依赖特性;CB颗粒作为陷阱具有较强的捕获电子能力;CB/LDPE复合介质在较大温度梯度下可有效地抑制绝缘层外侧场强的显著增加。分析认为CB颗粒的陷阱作用是改善CB/LDPE复合介质空间电荷和电导特性的主要原因,而CB/LDPE复合介在较大温度梯度下抑制场强畸变则归因于其合理的电导特性。展开更多
文摘High density polyethylene filled with condutuctive carbon black was prepared by conventional meltmixing method. The effect of unidirectional pressure on the conductivity was studied. Wide angle X-ray diffraction （ WAXD ） was used to slum： the influence of pressure on the aggregate structure of the polymer filled with carbon black （CB） fillers. A model on the basis of the formation and destruction of conductive networks was proposed to explain the change in the conductivity with the application of pressure.
文摘为研究低剂量炭黑(carbon black,CB)对低密度聚乙烯(low density polyethylene,LDPE)空间电荷和电导特性的影响,该文采用熔融共混法制备了CB/LDPE复合介质,利用电声脉冲法测试LDPE和CB/LDPE复合介质的空间电荷分布,并在不同温度下测试了其直流电导特性。采用量子化学分子动力学模拟等手段对CB/LDPE复合介质的陷阱特性进行研究。另外采用多物理场耦合软件COMSOL Multiphysics分别仿真研究了以LDPE和CB/LDPE复合介质为绝缘的直流电缆绝缘层内电场分布。结果表明:CB/LDPE复合介质具有较强的空间电荷抑制能力、较低的电导率和电导温度依赖特性;CB颗粒作为陷阱具有较强的捕获电子能力;CB/LDPE复合介质在较大温度梯度下可有效地抑制绝缘层外侧场强的显著增加。分析认为CB颗粒的陷阱作用是改善CB/LDPE复合介质空间电荷和电导特性的主要原因,而CB/LDPE复合介在较大温度梯度下抑制场强畸变则归因于其合理的电导特性。
