Use of styrene butadiene rubber industrial waste devulcanized by microwave in rubber composites for automotive application

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• 作者：A. Zanchet^a ; L.N. Carli^a ; ^b ; M. Giovanela^a ; R.N. Brandalise^a ; J.S. Crespo^a ; ^{jscrespo@ucs.br}
• 关键词：Elastomers and rubber ; Recycling ; Mechanical
• 刊名：Materials and Design
• 出版年：2012
• 期刊代码：56_02613069
• 类别：ms
• 出版时间：August, 2012
• 卷：39
• 期：Complete
• 页码：437-443
• 文件大小：728 K

摘要

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 3 min. The composites were developed by the incorporation of 80 phr (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 2 min 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.