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Dynamically Vulcanized PP/EPDM Blends: Effect of Composition and Curing Agents

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

Tatiana Louise Ávila De Campos Rocha

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

Marly Antonia Maldaner Jacobi

Instituto de Química, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500 Porto Alegre 91501-970, Brazil, jacobi{at}iq.ufrgs.br

The comparative study between two curing agents, conventional peroxide (Peroximon) and bismaleimide/dicumyl peroxide combination (BMI/DCP), and the influence of composition in TPE-Vs based on polypropylene (PP) and ethylene—propylene—diene terpolymer (EPDM) were investigated. The materials were characterized by mechanical, hardness, swelling and morphological properties. The TPE-Vs obtained using Peroximon presented lower tensile strength, remarkable lower deformation and swelling degrees than those cured with BMI/DCP. Among all the investigated PP/EPDM compositions, the content of thermoplastic increases the tensile at break. The experimental swelling values are in agreement with the theoretical for the TPE-Vs obtained using BMI/DCP and for the obtained using Peroximon all compositions showed experimental swelling degree higher than the theoretical ones. The hardness is determined by the amount of PP. We also observed in the morphology studies that the rubber domains are smaller and better defined when the BMI/DCP is used.

Key Words: thermoplastic elastomers • dynamic vulcanization • peroxide • bismaleimide • polypropylene • EPDM • TPV.

This version was published on September 1, 2009

Journal of Elastomers and Plastics, Vol. 41, No. 5, 433-446 (2009)
DOI: 10.1177/0095244309100531


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