Espumas rígidas de poliuretano modificadas com cimento lodo de alumínio anodizado e lodo de vidro

• Autor(a) principal: Braglia, Thiago de Alcântara
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Universitário da Ânima (RUNA)
• Texto Completo: https://repositorio.animaeducacao.com.br/handle/ANIMA/2502
• topic: Thermoacoustic composites; Flammability; Aluminium-anodising sludge; Sludge from glass cutting and polishing

This article aims to study the physico-mechanical strength and fire resistance of polyurethane/cement (PuCem) composites containing glass sludge nanoparticles (GLA) and nanoparticles from aluminium anodization (AAS). Scanning electron microscopy (SEM) results show that the replacement of 24.5% of the cement with sand (SAN), AAS or GLA maintained the alveolar structure in the composites; in addition, energy-dispersive X-ray spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR) analyses show that the cement hydration reaction forms hydrated aluminates and silicates. Through the ANOVA-Tukey tests for the areas and circularity of the alveoli, the areas of the PuCemAas composites are significantly different from those of PuCemGla and PuCemSan, which are similar to each other. In their circularity, the PuCemGla and PuCemSan composites are significantly different from PuCem and PuCemAas, which are similar to each other. The compressive strength decreased upon replacing cement with the aggregates. The DTA/TGA thermograms were similar for the four composites and the polyurethane (PU) matrix. The specimens were classified as flammable in the horizontal position but declassified in the vertical position (UL94). The composites offered a sound barrier between 125 Hz and 8 kHz. The hot wire test showed higher thermal insulation for PuCemGla and PuCemAas. It is concluded from a radar chart that PuCemAas presented the best result among the prepared composites.