Análise da resistência à flexão de nanocompósitos poli (metil metacrilato) / prata (PMMA / Ag)

• Autor(a) principal: Silva, Ebele Adaobi [UNESP]
• Data de Publicação: 2009
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/156233; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2018-01-15/000893833.pdf
• topic: Polimetil metacrilato; Prata; Nanopartículas; Polymethyl methacrylate

The aim of this study was to evaluate the flexural strength of the nanocomposites poli (metyl methacrylate)/silver (PMMA/Ag). For attainment of the nanocomposite, it was used an acrylic resin heat- polymerized (Lucitone 550) and silver colloid nanoparticles (SNC) with average sizes of 5 and 10 nm.Silver nanoparticles were synthetized by of silver nitrate by the sodium citrate.The form and the size of particles were confirmed by transmission and scanning electronic microscopy.The SNC were added to the resin in concentrations of 0% (0 μL), 0.05% (2 μL), 0.5% (20 μL) and 5% (200 μL) according to the weight the of polymer.For each concentration and size of SCN 10 specimens were fabricated.Also, acrylic resin specimens were made adding deionized water in the same concentrations used for SNC.After the laboratorial processing, the specimens were stored in deionized water at 37º C for 50 ± 2h before the mechanical test.The specimens were submitted to the flexural test three points in a universal machine (EMIC, DL 3000), with a constant speed of 5mm/min, until the breaking occurred. This machine registered the strength (MPa) necessary for specimen breaking.The values of flexural strength were compared one way by ANOVA and the post-hoc Tukey test with level of 5%.The nanocomposites PMMA/Ag containing silver nanoparticles with size of 5 nm in all concentrations were statiscally different the control ( with no addition of SCN or water),from tre group where was added colloid concentration was 5% (P < 0,01).All the groups with silver nanoparticles with size of 10 nm statiscally similar.(P > 0,05). Comparing the different sizes in each concentration, it there were no statistical significant difference between both sizes silver nanoparticles and the control (P> 0,05) for concentrations 0.05 and 0.5%. For concentration 5%, the group with nanoparticles of size 5 nm was statiscally different...