Nanocompósitos de polietileno de alta densidade : nitreto de boro hexagonal para aplicações em embalagens

• Autor(a) principal: Santos, Michelle Cristina Corrêa dos
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações do Mackenzie
• Texto Completo: http://dspace.mackenzie.br/handle/10899/26439
• topic: nanocompósito; PEAD; hBN; embalagens; CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA

This work concerns the preparation and characterization of HDPE-based high density polyethylene (HDPE) nanocomposites with incorporation of hexagonal boron nitride (hBN) nanoparticles to obtain materials with improvements in mechanical performance and gas barrier properties. when compared to pure HDPE. The hBN was obtained by liquid exfoliation in water and characterized by UV-Vis Spectroscopy, Raman Spectroscopy, Scanning Electron Microscopy and Atomic Force Microscopy. The results indicated that the exfoliation process used is strongly dependent on the exfoliation time, but it was efficient generating a material with low number of stacked layers. The nanocomposites were obtained by melt blending using the Solid Solid Deposition - SSD method in a double screw extruder to obtain final loading concentrations ranging from 0.05% to 1.0% by weight. A second extrusion was performed to produce the films (single screw extruder). Nanocomposites (after first extrusion) were analyzed by Exploratory Differential Thermal Analysis (DSC), X-ray Diffraction (XRD), Infrared Spectroscopy (FTIR) and Mechanical Tests. The HDPE / hBN nanocomposite (0.10%) presented outstanding results in all the analyzes used when compared with the others, indicating the existence of a better charge distribution and dispersion in the polymeric matrix. The films produced by the second extrusion were evaluated by Contact Angle, Tensile Test, Water Vapour Permeability and Oxygen Permeability. HDPE / hBN nanocomposite film (0.10%) achieved better mechanical properties by stretching in the extrusion direction, as well as low water vapor permeation.