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Abstract

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.

Keywords

styrene-butadiene rubber scraps microwave devulcanization cure characteristics mechanical and chemical properties.

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References

Fang, Y. , Zhan, M. and Wang, Y. ( 2001). The Status of Recycling of Waste Rubber, Mater . Design, 22: 123-128.

Adhikari, B. , De, D. and Maiti, S. ( 2000). Reclamation and Recycling of Waste Rubber, Prog. Pol. Sci., 25: 909-948.

Hofmann, W. ( 1989). Rubber Technology Handbook, Munich : Hanser Publishers.

Novotny, D.S. , Marsh, R.I. , Masters, F.C. and Tally, D.N. (1978). Microwave Devulcanization of Rubber. U.S. Patent No. 4,104,205.

Myhre, M.J. and Mackillop, D.A. ( 2002). Rubber Recycling, Rubber Chem. Technol. , 75: 429-473.

Sverdrup, E.F. and Elgin, J.C. (1947). Reclaiming Rubber. U.S. Patent No. 2,415,449.

Isayev, A.I. , Yushanov, S.P. and Chen, J. ( 1996). Ultrasonic Devulcanization of Rubber Vulcanizates. I. Process Model, J. Appl. Polym. Sci., 59: 803-813.

Scuracchio, C.H. , Waki, D.A. and Silva, M.L.C.P. (2007). Thermal Analysis of Ground Tire Rubber Devulcanized by Microwaves, J. Therm. Anal. Calorim., 87: 893-897.

Bilgili, E. , Arastoopour, H. and Bernstein, B. ( 2001). Pulverization of Rubber Granulates Using the Solid State Shear Extrusion Process. Part II: Powder Characterization, Powder Technol., 115: 277-289.

10.

Weber, T. , Zanchet, A. , Brandalise, R.N. , Crespo, J.S. and Nunes, R.C.R. ( 2008). Grinding and Characterization of Scrap Rubbers Powders , J. Elastom. Plast., 40: 147-159.

11.

Massarotto, M. , Crespo, J.S. , Zattera, A.J. and Zeni, M. (2008). Characterization of Ground SBR Scraps from Shoe Industry, Mater. Res., 11: 85-88.

12.

Carli, L.N. , Boniatti, R. , Teixeira , C.E. , Nunes, R.C.R. and Crespo, J.S. (2009). Development and Characterization of Composites with Ground Elastomeric Vulcanized Scraps as Filler, Mater. Sci. Eng. C, 29: 383-386.

13.

Flory, P.J. ( 1953). Principles of Polymer Chemistry, New York: Cornel University .

14.

Kraus, G. ( 1963). Swelling of Filler-reinforced Vulcanizates, J. Appl. Polym. Sci., 7: 861-871.

15.

Levin, V.Y. , Kim, S.H. , Isayev, A.I. , von Meerwall , E. and Massey, J. ( 1996). Ultrasound Devulcanization of Sulphur Vulcanized SBR: Cross Link Density and Molecular Mobility, Rubber Chem. Technol. , 69: 104-114.

16.

Bilgili, E. , Dybek, A. , Arastoopour , H. and Bernstein, B. (2003). A New Recycling Technology: Compression Molding of Pulverized Rubber Waste in the Absence of Virgin Rubber , J. Elastom. Plast., 35: 235-256.

17.

Scuracchio, C.H. , Waki, D.A. and Bretas, R.E.S. (2006). Caracterização Térmica e Reológica de Borracha de Pneu Desvulcanizada por Microondas , Polímeros: Ciência e Tecnologia, 16: 46-52.

18.

Nelson, P.A. and Kutty, S.K.N. (2002). Cure Characteristics and Mechanical Properties of Butadiene Rubber/Whole Tyre Reclaimed Rubber Blends, Progr. Rubber Plast. Tech., 18: 85-97.

Characterization of Microwave-Devulcanized Composites of Ground SBR Scraps

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