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为了探讨纳米蒙脱土对聚乙烯击穿性能和电导特性的影响,采用威布尔(Weibull)统计的方法分析了电介质的击穿场强,利用电导温度谱图分析了不同试样电导的温度特性,用扫描电镜(SEM)和原子力显微镜(AFM)对复合材料的微结构进行了表征。研究了插层温度和电老化对聚乙烯复合材料击穿性能的影响及其电导的温度特性,以及电介质电击穿后结构的变化。结果表明,用蒙脱土对聚乙烯进行改性能明显提高其击穿性能和改善电导特性:与纯聚乙烯相比,聚乙烯/蒙脱土复合材料试样具有明显的极性电介质的损耗特征,而且复合材料试样的绝缘电阻率在50~60°C的温度范围内明显高于低密度聚乙烯(LDPE)的值;而耐电老化性能也有所提高:在电老化66 h后,其击穿场强是纯聚乙烯的1.10倍;并且蒙脱土与聚乙烯形成的强的相互作用区像“交联点”等,能明显减少复合材料的电场破坏。可见,纳米蒙脱土的加入有望提高聚乙烯的长期介电强度和耐温等级。
In order to investigate the effect of nano-montmorillonite on the breakdown and conduction properties of polyethylene, the breakdown field strength of the dielectric was analyzed by Weibull statistical method. The temperature characteristics of the conductance of different samples were analyzed by using the conductance temperature spectrum The microstructures of the composites were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The effects of intercalation temperature and electro-aging on the breakdown behavior of polyethylene composites and the temperature characteristics of their conductance were investigated. The structure of the composites was also investigated. The results show that the modification of polyethylene with montmorillonite can obviously improve its breakdown performance and improve the conductivity characteristics: Compared with pure polyethylene, polyethylene / montmorillonite composite samples have obvious loss characteristics of the polar dielectric , And the insulation resistivity of the composite samples was significantly higher than that of the low-density polyethylene (LDPE) in the temperature range of 50-60 ° C; the aging resistance was also improved: after 66 h of electrical aging, The breakdown strength is 1.10 times that of pure polyethylene; and the strong interaction zone formed by montmorillonite and polyethylene like “cross-linking point ” can significantly reduce the electric field damage of the composite material. Can be seen that the addition of nano-montmorillonite is expected to increase long-term polyethylene dielectric strength and temperature level.