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Use of styrene butadiene rubber industrial waste devulcanized by microwave in rubber composites for automotive application
Highlights ► Rubber composites filled with SBR industrial waste devulcanized by microwaves. ► Rheometric and physical–mechanical properties. ► Thermo and photo-oxidation aging process. ► Application of the composites in automotive profiles.
Abstract The aim of this work was to develop and characterize styrene butadiene rubber (SBR) composites filled with SBR industrial scraps (SBR-r) devulcanized by microwave. The SBR-r was ground under ambient conditions and subjected to microwave exposure for 1, 2 and 3min. The composites were developed by the incorporation of 80phr (parts per hundred of rubber) of the devulcanized SBR-r into the rubber matrix and subsequent revulcanization. The rheometric and physical–mechanical properties (shore A hardness, compression set, tensile and tear strength) were determined. The samples were submitted to two types of accelerated aging processes, in an air oven (thermo-oxidation) and an artificial weathering test in a UV chamber (photo-oxidation). The results were compared with a control sample submitted to the same conditions. For further application in automotive profiles, the set of results indicated that the best performance was achieved by the composite containing SBR-r devulcanized for 2min in a microwave. For this composite, the changes in the chemical characteristics after aging were evaluated with cross-link density and Attenuated Total Reflectance–Fourier Transform Infrared Spectroscopy (ATR–FTIR) analyses. The results revealed that the aging mechanism was dependent on the presence of SBR-r and on the time of aging. The cross-link density analysis confirmed the occurrence of cross-link scissioning at shorter aging times and the formation of additional cross-linking in the postcure process. The ATR–FTIR results indicated an oxidative process occurring on the surface of the composites for both aging processes. Moreover, artificial weathering presented a more pronounced change in the chemical structure of the samples.
Use of styrene butadiene rubber industrial waste devulcanized by microwave in rubber composites for automotive application
Highlights ► Rubber composites filled with SBR industrial waste devulcanized by microwaves. ► Rheometric and physical–mechanical properties. ► Thermo and photo-oxidation aging process. ► Application of the composites in automotive profiles.
Abstract The aim of this work was to develop and characterize styrene butadiene rubber (SBR) composites filled with SBR industrial scraps (SBR-r) devulcanized by microwave. The SBR-r was ground under ambient conditions and subjected to microwave exposure for 1, 2 and 3min. The composites were developed by the incorporation of 80phr (parts per hundred of rubber) of the devulcanized SBR-r into the rubber matrix and subsequent revulcanization. The rheometric and physical–mechanical properties (shore A hardness, compression set, tensile and tear strength) were determined. The samples were submitted to two types of accelerated aging processes, in an air oven (thermo-oxidation) and an artificial weathering test in a UV chamber (photo-oxidation). The results were compared with a control sample submitted to the same conditions. For further application in automotive profiles, the set of results indicated that the best performance was achieved by the composite containing SBR-r devulcanized for 2min in a microwave. For this composite, the changes in the chemical characteristics after aging were evaluated with cross-link density and Attenuated Total Reflectance–Fourier Transform Infrared Spectroscopy (ATR–FTIR) analyses. The results revealed that the aging mechanism was dependent on the presence of SBR-r and on the time of aging. The cross-link density analysis confirmed the occurrence of cross-link scissioning at shorter aging times and the formation of additional cross-linking in the postcure process. The ATR–FTIR results indicated an oxidative process occurring on the surface of the composites for both aging processes. Moreover, artificial weathering presented a more pronounced change in the chemical structure of the samples.
Use of styrene butadiene rubber industrial waste devulcanized by microwave in rubber composites for automotive application
Zanchet, A. (author) / Carli, L.N. (author) / Giovanela, M. (author) / Brandalise, R.N. (author) / Crespo, J.S. (author)
2012-03-10
7 pages
Article (Journal)
Electronic Resource
English
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