Publicação
Characterization of metallized polypropylene films
| Resumo: | The main goal of a capacitor is to store energy and release it in a circuit when needed. There are in the market several types of capacitors, as film capacitors, ceramic capacitors and electrolytic capacitors. For this study, it will be presented a metallized film capacitor. Film capacitors are electronic components with a high importance in a lot of electronic devices. They are used in different applications as, for instance, in televisions, radios, automotive industry, renewable energy devices, like solar panels and in hybrid and electrical cars. Different materials and components can be part of a film capacitor, as a plastic case, an epoxy, a thin plastic film metallized with metal alloys, solder, wires, and terminals. The focus of this work is the body of the film capacitor, which is the plastic film, metallized with a very thin metal layer. The intend of this work was to study six different polypropylene grades, from several suppliers, using different characterization techniques, as Differential Scanning Calorimetry, Fourier Transform Infrared Spectroscopy, Atomic Force Microscopy and Scanning Electron Microscopy. These techniques allow a better understanding of the behaviour and performance of each material, throughout the life of a film capacitor and prevent the failures during its life cycle. Thus, they had shown that there are some properties that influence the behaviour of each sample, as for instance, the surface roughness, the BOPP fabrication process (sequential stretching versus simultaneous stretching) and thickness, which influence crystals grains and the polymer chain orientation, that in turn, influence the crystallinity. All these techniques gave an important contribute for the understanding of the different polypropylene samples, concluding that sample 5 seems to be the best material to be used in a film capacitor, due to its high crystallinity, constant roughness, high Young Modulus and low shrinkage. |
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| Autores principais: | Santos, Sílvia Patrícia Gonçalves dos |
| Assunto: | BOPP Film capacitors Metallized film capacitor Polypropylene Condensador de filme metalizado Condensadores de filme Polipropileno Ciências Naturais::Outras Ciências Naturais |
| Ano: | 2021 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | The main goal of a capacitor is to store energy and release it in a circuit when needed. There are in the market several types of capacitors, as film capacitors, ceramic capacitors and electrolytic capacitors. For this study, it will be presented a metallized film capacitor. Film capacitors are electronic components with a high importance in a lot of electronic devices. They are used in different applications as, for instance, in televisions, radios, automotive industry, renewable energy devices, like solar panels and in hybrid and electrical cars. Different materials and components can be part of a film capacitor, as a plastic case, an epoxy, a thin plastic film metallized with metal alloys, solder, wires, and terminals. The focus of this work is the body of the film capacitor, which is the plastic film, metallized with a very thin metal layer. The intend of this work was to study six different polypropylene grades, from several suppliers, using different characterization techniques, as Differential Scanning Calorimetry, Fourier Transform Infrared Spectroscopy, Atomic Force Microscopy and Scanning Electron Microscopy. These techniques allow a better understanding of the behaviour and performance of each material, throughout the life of a film capacitor and prevent the failures during its life cycle. Thus, they had shown that there are some properties that influence the behaviour of each sample, as for instance, the surface roughness, the BOPP fabrication process (sequential stretching versus simultaneous stretching) and thickness, which influence crystals grains and the polymer chain orientation, that in turn, influence the crystallinity. All these techniques gave an important contribute for the understanding of the different polypropylene samples, concluding that sample 5 seems to be the best material to be used in a film capacitor, due to its high crystallinity, constant roughness, high Young Modulus and low shrinkage. |
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