Avaliação das propriedades mecânicas e reológicas de composições de borracha nitrílica vulcanizadas com resina fenólica

• Autor(a) principal: Sanchez, José Luiz Leite
• Data de Publicação: 2008
• 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/1/15657
• topic: Nitrile rubber; phenolic resin; vulcanization; physico-mechanical properties; rheological properties; Borracha nitrílica; resina fenólica; vulcanização; propriedades físico-mecânicas; propriedades reológicas; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ORGANICA::POLIMEROS E COLOIDES

In this Thesis Dissertation, acrylonitrile-butadiene rubber (NBR) compositions were vulcanized using phenolic resin and sulfur as vulcanization agents with different proportions of phenolic resin and only one proportion of sulfur. The activator system was composed of polycloroprene and zinc oxide to phenolic resin compositions, while stearic acid and zinc oxide to sulfur composition. The materials were vulcanized in a temperature of 190ºC. The influence of the components content on rheometric, physico-mechanical and rheological properties of the materials was evaluated. In order to assist in the interpretation of the to physico-mechanical and rheometric properties results, a statistical planning of variant analysis was used to observe a possible influence of the variables and also their possible associations into the evaluated properties. The results showed that the nitrile rubber become more stiffness with the presence of phenolic resin. It was also observed the occurrence of post-vulcanization on the compositions vulcanized with phenolic resin. The rheological results showed homogeneity of the samples submitted to a strain sweep test, with a linear plateau until 10% of strain.