Influência da dispersão do GO e RGO em nanocompósitos em aplicações de membranas para permeação de gases em recobrimentos do aço API 5L X80 de poliuretano

• Autor(a) principal: Silva, Alessandro Eronides de Lima
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/16420
• topic: Mechanical engineering; Nanocomposites (Materials); Carbon; Metal coating; Surfaces (Technology); Material strength; Stainless steel; Graphene oxide; Gas permeation; Friction measurements; Ultrasonic dispersion; Engenharia mecânica; Nanocompósitos (Materiais); Carbono; Revestimento em metal; Superfícies (Tecnologia); Resistência de materiais; Aço inoxidável; Grafeno oxidado; Permeação de gases; Medições de atrito; Dispersão ultrassônica; ENGENHARIAS::ENGENHARIA MECANICA::MECANICA DOS SOLIDOS

The coating industry has been working to improve the surface properties as wear, adhesion and wettability. In this sense, polymer nanocomposites have recently attracted major attention. The nanocomposites production is cheaper and it is possible to coat over steel substrates with a simple step process. The graphene oxide, combined with polymers, has shown an impermeable nanocomposite barrier to gases and liquids and from this perspective it has attracted a particular interest for applications on oil and gas industrial parts. In many cases, nanocoating acts as protective film that may prevent future corrosion problems and extend the devices lifetime. The polymer membranes have a more efficient function than the polymer membranes. In this work, we report the influence of dispersion of graphene oxide (GO) and reduced graphene oxide (RGO) on polyurethane for gas permeation and friction behavior studies on steel stainless (X80 API 5L), to endorse its use for mechanical and chemical protection applications. We have produced graphene/polyurethane nanocomposites and subsequently dispersed using an ultrasonic tip. The samples obtained have been tested in a permeation analysis system and friction analysis. The samples were studied by scanning electron microscopy (SEM), optical microscopy. Force atomic microscopy and Raman Spectroscopy. Friction measurements were performed using a CTER micro-tribometer in a ball-on-disk contact geometry using an inox steel ball as counter body. Friction tests showed a reduction in COF (coefficient of friction) with graphene oxide using ultrasonic dispersion. Gas permeation tests showed that films composed by GO had a reduction of 19% in relation to CO2 and 26% in relation to N2. The modified films with RGO had the permeability reduced by 13% in relation to CO2 and 25% in relation to N2