More and more electronic devices are being produced and most of them are disposed of improperly. In addition, as they contain heavy metals and toxic substances in their composition, the environmental impact increases. This work aims to study the recycling of polymers present in e-waste through the mechanical characterization of polymer blends produced with the main polymers present in printers. To do so, printers were dismounted, the material of the components was classified, and the main polymers were processed. The sample consisted of 20 printers, from which HIPS-90%/PS-10%, HIPS-90%/ ABS-10% and HIPS-100%, blends were processed by extrusion and injection of specimens with tensile test geometry. The tensile strength was 39.0 MPa for HIPS/ABS, and 37.5 MPa for HIPS/PS. Despite having slightly different mechanical properties, probably due to possible variations in their chemical composition, the formulations have good quality and potential for use in new products such as hangers, organizing boxes, soles and, watering cans.
<p>O presente artigo aborda a temática relativa aos limites e possibilidades para a eficácia das sentenças prolatadas pela Corte Interamericana de Direitos Humanos a nível brasileiro, tendo em vista a sua dificuldade de concretização plena. O objetivo deste trabalho reside em apresentar soluções para um problema de longa data, a partir da análise dos casos envolvendo o Brasil, e as contribuições expressivas trazidas pelo direito comparado. Considerando o problema enfrentado, foi utilizado o método fenomenológico-hermenêutico, pois, o objeto de estudo faz parte do mundo social e os resultados obtidos na pesquisa visam atribuir sentido e importância às presentes e futuras ações de efetividade das sentenças. Por isso, da importância de um estudo dirigido de forma crítica e interpretativa sob esse método introduzido por Martin Heidegger e aprofundado por Hans-Georg Gadamer. O ponto de partida apresentado por Heidegger mostra sua pertinência no discorrer da pesquisa, tendo em vista a referência histórica dada à evolução dos Direitos Humanos no Brasil e no Mundo (Stein, 1979). Foram feitos estudos de casos, método comparativo entre eles, pesquisa bibliográfica nacional e estrangeira e pesquisa jurisprudencial. Como principais resultados da pesquisa elaborada, o Brasil peca na falta de responsabilização dos culpados, mas, cumprindo com a prestação de valores pecuniários exigidos, e com a implementação (ainda que insuficiente) das medidas solicitadas. É necessário que os Direitos Humanos se convertam, realmente, em uma política de estado, e não meramente em um ‘discurso’ a ser levantado pelas bandeiras políticas dos países sem aplicabilidade prática.</p>
Among the 40 million tons/year of e-waste discarded in the world, the recycling of polymers depends on the correct separation in disassembly as well as control of fluidity during processing. The objective of this study is to analyze the feasibility of HIPS blends recycling with other main polymers present in printers, through the analysis of the influence of pressure and speed parameters of injection to subsequently perform tensile tests for mechanical characterization. For this purpose, post-consumption polymers from disassembled printers were separated for analysis and comparison of HIPS-90%/PS-10% blend with HIPS-100%, which were injected into a mold with geometry of test specimens for tensile test, complying with ASTM standard D638-14, employing variations in pressure and speed and maintaining constant temperature. To identify the influence of levels of pressure between 45 and 60 bar and speed between 45 and 60 mm/min in yield point and elongation of the material a two-way ANOVA without replication was applied. When comparing the different levels of pressure and speed considered and evaluated in relation to the material composition, there were no significant differences between the levels, for both yield strength and for elongation. It was verified a variation on the mechanical properties of the PSHI and PS blend in relation to the pure PSHI, probably due to the amount of brominated flame retardants and elastomers present in PSHI from printers.
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