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      Caracterização das propriedades reológicas e dinâmicas de composições de borracha natural com resíduo de EVA Translated title: Characterization of rheological and dynamic properties of natural rubber compositions with waste EVA

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          Abstract

          O resíduo de EVA oriundo das indústrias calçadistas é um material reticulado, que apresenta grande potencial de uso como carga em composições elastoméricas. Neste trabalho, foram avaliadas as propriedades reológicas e dinâmicas das composições de borracha natural (NR) com resíduo de EVA (EVAR), determinadas com o auxílio do analisador de processamento de borracha (RPA). As composições não-vulcanizadas tiveram a sua viscosidade aumentada pela adição de teores crescentes de EVAR. Após a vulcanização essas composições apresentaram menor elasticidade que a NR pura, como evidenciado nas maiores taxas de relaxamento do módulo e nos maiores valores de tan delta. Este comportamento foi confirmado pelos resultados de tensão e alongamento na ruptura.

          Translated abstract

          The EVA waste (EVAR) is a crosslinked material, which can be used as filler in rubber compositions. In this work, rheological and dynamic properties of natural rubber (NR) compositions with EVAR were investigated before and after vulcanization with the help of a rubber processing analyzer (RPA). The filler content varied from 0 to 60 phr. The results showed that rheological properties of nonvulcanized compositions were clearly modified by the addition of EVAR, which contributed to an increase in viscosity. The modulus relaxation and the dynamic properties such as tan delta of vulcanized compositions were also affected, by the reduction of the elasticity of the compositions. The mechanical properties corroborated the behavior revealed by RPA analysis and indicated that EVAR acted as a non-reinforcing filler.

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          Most cited references 12

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          J. Appl. Polym. Sci.

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            J. Appl. Polym. Sci.

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              Macromol. Symp.

               H. Schnecko (1998)
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                po
                Polímeros
                Polímeros
                Associação Brasileira de Polímeros (São Carlos )
                1678-5169
                December 2004
                : 14
                : 5
                : 301-306
                Affiliations
                [1 ] Instituto Nacional de Tecnologia
                [2 ] Universidade Federal do Rio de Janeiro Brazil
                Article
                S0104-14282004000500005
                10.1590/S0104-14282004000500005
                Product
                Product Information: website
                Categories
                POLYMER SCIENCE

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