The Effect of Carbon Black Reinforcement on the Dynamic Fatigue and Creep of Polyisobutylene-Based Biomaterials

 

Götz, C.1, Lim, G.T.2, Puskas, J.E.2,3, Altstädt, V.1 

1 Department of Polymer Engineering, Faculty of Engineering Science, University of Bayreuth, Universitätsstraβe 30, Bayreuth D-95447, Germany

2 Department of Chemical and Biomolecular Engineering, University of Akron, Akron, OH 44325-0406, USA

3 Department of Polymer Science, University of Akron, Akron, OH 44325-3909, USA

 

This paper investigates the structure-​property relationship of a new generation of poly(styrene-​b-​isobutylene-​b-​styrene) (SIBS) block copolymers with a branched (dendritic) polyisobutylene core with poly(isobutylene-​b-​para-​methylstyrene) end blocks (D_IBS)​, and their carbon black (CB) composites.  These materials display thermoplastic elastomeric (TPE) properties, and are promising new biomaterials.  It is shown that CB reinforced the block copolymer TPEs, effectively delayed the oxidative thermal degrdn. of the D_IBS materials, and greatly improved their dynamic fatigue performance.  Specifically, the dynamic creep of a CB composite was comparable to that of chem. crosslinked and silica-​reinforced medical grade silicone rubber, used as a benchmark biomaterial.

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