Abstract
In this article, low-density polyethylene (LDPE) was used as a matrix polymer, the Micro-ZnO and Nano-ZnO particles were used as the inorganic filler. With the melt blending method, the Nano-ZnO/LDPE(Nano-ZnO particles doping into LDPE), Micro-ZnO/LDPE(Micro-ZnO particles doping into LDPE) and Micro-Nano-ZnO/LDPE (Nano-ZnO and Micro-ZnO particles doping into LDPE in the same time) composites were prepared. Then, the inorganic filler and the composites were dealt with structural characterizations and analysis by Fourier transform infrared (FTIR), Polarization microscope (PLM), and Differential scanning calorimeter (DSC). Besides, these samples were dealt with (alternating current) AC breakdown performance test. The micro-experimental results showed that the Micro-ZnO and Nano-ZnO particles doping reduced the crystal size and increased the crystallization rate. With the change of cell structure, the crystallinity of composites increased. The crystallinity order of different samples was as follows: LDPE < Micro-ZnO/LDPE < Nano-ZnO/LDPE < Micro-Nano-ZnO/LDPE. From the breakdown of the experimental result, with the same mass fraction of the different inorganic doping of particles, the breakdown strength of these composites was different. The Nano-ZnO particle doping could improve the breakdown strength of composites effectively. Among them, the breakdown strength of Nano-ZnO/LDPE and Micro-Nano-ZnO/LDPE were 11% higher and 1.3% lower than that of pure LDPE, respectively. Meanwhile, the breakdown strength of Micro-composite was the lowest but its Weibull shape coefficient was the highest. Therefore, the Micro-ZnO doping was helpful for the Nano-ZnO dispersing in the matrix, which produced the Micro-Nano-synergy effects better.
Highlights
With economic growth, the power supplies were far from enough to meet the growing demand for economic and social development
Some problems became more serious, such as the lack of transmission corridors and the excess of short-circuit current. (Ultra High Voltage) UHV transmission possessed many advantages such as low-loss, long-distance, and high-capacity, which could offset the flaw of Materials 2020, 13, 1432; doi:10.3390/ma13061432
The low-density polyethylene (LDPE) was used as the matrix, the Micro-ZnO and Nano-ZnO particles were used as theIninorganic filler
Summary
The power supplies were far from enough to meet the growing demand for economic and social development. The greater demands for transmission capacity and safety of the power grid had been put forward [1,2]. Due to the conveying distance limit of the high-voltage transmission system, the cross-regional power exchange and new energy access were difficult to achieve. (Ultra High Voltage) UHV transmission possessed many advantages such as low-loss, long-distance, and high-capacity, which could offset the flaw of Materials 2020, 13, 1432; doi:10.3390/ma13061432 www.mdpi.com/journal/materials. Materials 2020, 13, 1432 current high voltage transmission. It was the inevitable development trend for the power grid [3,4]. With the improvement of transmission voltage degree, the higher electrical insulation performance request to insulating material of transmission line and power equipment were proposed
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