Sensibilidade elétrica dos revestimentos compósitos de poliamida 6/quasicristais puros e reciclados produzidos via Spin Coating

• Ano de defesa: 2022
• Autor(a) principal: Sousa, Antonia Pamela de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraíba; Brasil; Engenharia Mecânica; Programa de Pós-Graduação em Engenharia Mecânica; UFPB
• Palavras-chave em Português: Resistência elétrica - Revestimentos compósitos; Quasicristal; Matriz de Poliamida 6 (PA6); Materiais reciclados - Impureza residual; Propriedades elétricas; Electrical resistance - Composite coatings; Quasicrystal; Polyamide 6 Matrix (PA6); Recycled materials - Residual impurity; Electrical properties; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/123456789/27025

Studies on new electronic materials, such as composite coatings with polymeric matrices, as well as new processing routes, have gained prominence due to the commercial increase of electronics, flexibility and ease of processing and cost reduction. Research already points to polymers with electrical properties through the addition of charges. Among the fillers and/or reinforcements that have been currently studied are the quasicrystalline alloys using recycled materials as precursors. However, one of the major concerns regarding recycled materials is the presence of residual impurities. These impurities, which contributed to the modification of electrical properties such as conductivity and electrical resistivity. Thus, the objective of this work is to develop composite coatings with a Polyamide 6 (PA6) matrix and pure and recycled quasicrystalline fillers (QC's), seeking to analyze the influence of impurities in the precursor materials of the alloys on the possible properties of electrical resistance of the composite coatings . And for that, pure and recycled quasicrystalline alloys were produced, treated and transformed into powders. Microstructural characterizations were carried out on the quasicrystalline powders and then composite coatings with a volumetric fraction of 0-11% of QC were produced, both for fillers with pure quasicrystal and for fillers with recycled quasicrystal, via the Spin Coating technique. Through UV-VIS it was seen that in samples with higher percentages of quasicrystals there was a reduction in Eg and a reduction in electrical resistance. With SEM, it was possible to observe changes in the morphology of the samples with an increase in the percentage of QC, corroborating the results of the DSC, which demonstrated a change in the degree of crystallinity of the PA6 matrix, with an increase in the fraction of reinforcement loads, mainly in composites with loads recycled.