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Journal of Elastomers and Plastics
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Characterization of Microwave-Devulcanized Composites of Ground SBR Scraps

Aline Zanchet

Center of Exact Sciences and Technology - University of Caxias do Sul 95070-560, Caxias do Sul - RS, Brazil

Larissa N. Carli

Center of Exact Sciences and Technology - University of Caxias do Sul 95070-560, Caxias do Sul - RS, Brazil

Marcelo Giovanela

Center of Exact Sciences and Technology - University of Caxias do Sul 95070-560, Caxias do Sul - RS, Brazil

Janaina S. Crespo

Center of Exact Sciences and Technology - University of Caxias do Sul 95070-560, Caxias do Sul - RS, Brazil, jscrespo{at}ucs.br

Carlos H. Scuracchio

Center of Applied Engineering, Modeling and Social Sciences - Federal University of ABC, Santo André - SP, Brazil

Regina C.R. Nunes

Eloísa Mano Macromolecular Institute - Federal University of Rio de Janeiro, Rio de Janeiro, RJ - Brazil

The recycling of waste rubber has considerable significance in terms of environmental protection and energy conservation. Considering that most of the relevant literature is concerned with tire recycling, the objective of this study is to develop and characterize styrene-butadiene rubber composites containing only industrial rubber scraps devulcanized by microwave. The styrene-butadiene rubber extruded profile scraps were collected and ground under ambient conditions. The obtained powder styrene-butadiene rubber-r was physically, thermally, and chemically characterized. From the devulcanized styrene-butadiene rubber-r two composites were prepared, varying the exposure time of the powder in the microwave (3 and 4 min). These composites were compared to a control sample supplied by the industry from which the styrene-butadiene rubber extruded profile scraps were collected. Vulcanization parameters were determined by oscillatory disk rheometry. Vulcanized composites were characterized by crosslink density and physical-mechanical properties (Shore A hardness, tensile and tear strength, and compression set) before and after a postcure process. The mechanical properties of the compositions were ~25% for tensile strength and 41% for tear strength compared to the control sample. The results for the crosslink density verified those for the mechanical properties of the composites.

Key Words: styrene-butadiene rubber scraps • microwave devulcanization • cure characteristics • mechanical and chemical properties.

This version was published on November 1, 2009

Journal of Elastomers and Plastics, Vol. 41, No. 6, 497-507 (2009)
DOI: 10.1177/0095244309345411
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