Desvulcanização do Resíduo de Terpolímero de Etileno Propileno Dieno (EPDM r) por Micro-ondas
Devulcanization of Ethylene-Propylene-Diene Polymer Residues (EPDM-r) by Microwaves
Pistor, Vinicius; Ornaghi, Felipe G.; Fiorio, Rudinei; Zattera, Ademir J.; Oliveira, Paulo J.; Scuracchio, Carlos H.
http://dx.doi.org/10.1590/S0104-14282010005000027
Polímeros: Ciência e Tecnologia, vol.20, n3, p.165-169, 2010
Resumo
Elastômeros vulcanizados são materiais comumente empregados em diversas aplicações, como nas indústrias automotiva e calçadista. Neste trabalho, aparas do terpolímero de etileno-propileno-dieno (EPDM-r) provenientes da indústria automotiva foram submetidas a micro-ondas durante diferentes tempos de exposição (2-5 min). Após a desvulcanização, as amostras foram caracterizadas por teor de gel, calorimetria exploratória diferencial (DSC) e energias de ativação de degradação (Ea) determinadas por análise termogravimétrica (TGA). O comportamento de degradação apresentou composição do EPDM-r condizente com a literatura. A análise de teor de gel demonstrou que o EPDM-r foi desvulcanizado quando exposto às micro-ondas por 5 minutos. As análises de DSC não indicaram modificações significativas nas amostras estudadas, e o estudo de Ea mostrou que os aditivos encontrados na composição do EPDM-r influenciam na eficiência do método de regeneração por micro-ondas.
Palavras-chave
EPDM-r, óleo, desvulcanização, micro-ondas, aditivos
Abstract
Vulcanized elastomers are materials commonly used in several applications, such as automotive and footwear industries. In this study, scraps of ethylene-propylene-diene terpolymer (EPDM-r) from the automotive industry were exposed to microwaves during different periods (2-5 min). After devulcanization, the samples were characterized by gel content, differential scanning calorimetry (DSC) and activation energy of degradation (Ea) determined by thermogravimetric analysis (TGA). The degradation behavior of EPDM-r was consistent with the literature. The gel content analysis showed that the EPDM-r was devulcanized only at 5 minutes of exposure to the microwaves. DSC analysis demonstrated no significant changes in the samples, and the Ea results confirmed that the additives found in the composition of the EPDM-r affect the efficiency of the regeneration method.
Keywords
EPDM-r, oil, devulcanization, microwave, additives
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21. Ozawa, T. A New Quantitative Differential Thermal Analysis, 38, p.1881 (1965).
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