Abstract
Photovoltaic (PV) power is one of the most effective green energies, which has attracted extensive attention from the industry and the international community. Polyethylene terephthalate (PET) is the main material of the PV backsheet, providing insulation protection for PV modules. Although PET has excellent optical properties, weather resistance, and chemical resistance, its relatively weak insulation properties restrict its application in engineering plastic. In this paper, the insulating properties of PET/montmorillonite (MMT) are studied. PET/MMT nanocomposites with an MMT content of 1%, 3%, and 5% are prepared by the melt blending method, and their insulating properties are tested. The results show that the addition of MMT can change the distribution of the electric field inside PET, thus, increasing the breakdown voltage. Furthermore, it can reduce the number of times of partial discharge (PD) and weaken the intensity of PD in PET/MMT composites to some extent. When the MMT content is 3%, PET/MMT composites have the best insulation performance. This study can provide a reference for the application of nanocomposites in the field of green energy.
Highlights
Owing to the rapid development of the modern economy and the continuous exploitation and utilization of energy, natural resources are becoming increasingly scarce
The results show that the addition of MMT can change the distribution of the electric field inside Polyethylene terephthalate (PET), increasing the breakdown voltage
PET/MMT nanocomposites with an MMT content of 1%, 3%, and 5% were prepared by the melt blending scitation.org/journal/adv method, and their insulating properties were studied
Summary
Owing to the rapid development of the modern economy and the continuous exploitation and utilization of energy, natural resources are becoming increasingly scarce. Filling modification is to conduct a special process to blend one or two different inorganic materials or modified organic materials with polyester PET, which is one of the most widely used PET. The partial discharge mechanism and insulating properties of PET/MMT materials have not been studied in the past. The insulating properties of PET/MMT nanocomposites are studied in this paper, which has a reference value for the extension of the service life of solar panels and the application of nanocomposites in the field of green energy power generation systems. Due to the chemical and physical properties of the used polymer matrix, as well as the modification methods and ion exchange capacity of the selected MMT particles, the preparation processes of the polymer/MMT are different. Untreated PET and PET/MMT composites were molded into sheet samples by an injection molding machine under a pressure of 50 MPa and temperature of 250–260 ○C, respectively. The length and width of the samples were 2 cm, and the thickness was 0.13 mm
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