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Crosslinking kinetics of SBR composites containing vulcanized ground scraps as filler

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Abstract

The aim of this study was to characterize the cure reaction of styrene–butadiene rubber (SBR) composites containing industrial rubber scraps. Different proportions of SBR ground scraps (SBR-r), varying from 10 to 80 parts per hundred of rubber, were incorporated into a base formulation of identical composition. Crosslink formation and the kinetics of the cure reaction were evaluated through oscillatory disk rheometry, differential scanning calorimetry, and crosslink density. Cure characteristics, such as scorch time and cure time, decreased with increasing SBR-r content. Minimum torque indicated only a small variation in the viscosity with the incorporation of SBR-r. The maximum torque decreased with the addition of scrap rubber, as a consequence of the reduction in virgin rubber content where crosslinks had been formed. Crosslink density values corroborated these findings, presenting a slight decrease with the increase in the SBR-r content. The kinetic study indicated lower enthalpy values for SBR-r composites compared to those of the control sample. The kinetic parameters, such as activation energy and reaction order, indicated a change in the mechanism of reaction, related to the increased complexity of the systems.

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Acknowledgments

The authors are grateful to Ciaflex Indústria de Borrachas Ltda. for supplying the SBR rubber scraps, additives, and the control sample, and to Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), to Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS—PqG 06/2010 1006663), and to Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for their financial support.

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Authors and Affiliations

  1. Centro de Ciências Exatas e Tecnologia, Universidade de Caxias do Sul, Rua Francisco Getúlio Vargas, 1130, Caxias do Sul, RS, 95070-560, Brazil

    Larissa N. Carli & Janaina S. Crespo

  2. Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, RS, 91501-970, Brazil

    Larissa N. Carli, Otávio Bianchi & Raquel S. Mauler

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  1. Larissa N. Carli
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  2. Otávio Bianchi
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  3. Raquel S. Mauler
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  4. Janaina S. Crespo
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Correspondence to Janaina S. Crespo.

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Carli, L.N., Bianchi, O., Mauler, R.S. et al. Crosslinking kinetics of SBR composites containing vulcanized ground scraps as filler. Polym. Bull. 67, 1621–1631 (2011). https://doi.org/10.1007/s00289-011-0521-0

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  • DOI: https://doi.org/10.1007/s00289-011-0521-0

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