Preparation and study of photodegraded polimeric matrix composites for photovoltaic cells encapsulation / Preparação e estudo da fotodegradação de compósitos de matriz polimérica para encapsulamento de células fotovoltaicas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The solar cells components are made off blades and metallic and ceramic semiconductors films. Such materials are not inert to the terrestrial atmosphere action. In this context, important part of the fotovoltaics modules production includes stages for the cells protection. These will have to be preserved from aggressive actions of the environment, for what they duly are encapsulated. The encapsulating material should have possess definitive properties and amongst them detaches the high resistance against degradation by ultraviolet radiation. Polimeric materials films such as poli(ethylene terephtalate) (PET) duly modified can be used due to its adequacy to the necessary properties to an encapsulating material. In this research, the prepared films are composites of poli(ethylene terephtalate) filled with gamma rays radiated and not radiated quartz particles and the ultraviolet radiation absorber Tinuvin. The choice of quartz and Tinuvin additives was based their expected optic behavior. The composites had been prepared according to an experiment matrix previously established. The emphasis of this work was given to the photodegradation phenomenon of these composites, over all when the polymer is displayed to the ultraviolet radiation. The pertinent mechanisms had been promoted in assays of exposition to the Q-UV wheatherometer chamber. The chemical composition of the quartz was successfully determinated by X rays fluorescence. The laser diffractometry, cyclosizer, the optic and scanner electronic microscopy had revealed to be adequate to the form and size characterization of the quartz particles. The optic behavior, the analysis of tensions and surfaces amorphization of quartz particles due to comminution had been successfully observed by UV-Visible spectroscopy and X ray diffraction, this last before and after thermal treatment. The surface yellowing and the composites microstructure was observed by optic and scanner electronic microscopy. The degree of photodegradation and its relation with the composites yellowing efficiently had been observed by infra-red ray spectroscopy with Fourier transform. The results had indicated that it is possible to prepare more resistant films against ultraviolet degradation and wheathering but it is necessary to better develop the preparations process for the films and additives particles so that the expected protection against photodegradation, due to the fillers optical behavior, can be better observed.

ASSUNTO(S)

engenharia de materiais e metalurgica quartzo, energia solar, materiais poliméricos, fotodegradação, compósitos, tinuvin, radiação ultravioleta, células fotovoltaicas. quartz, solar energy, polimeric materials, photodegradation, composites, tinuvin, ultraviolet radiation, fotovoltaics cells.

ACESSO AO ARTIGO

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