Synthesis and Characterization of Thermoplastic Elastomers with Polyisobutylene and Polyalloocimene Blocks

 

Attila L. Gergely1, Judit E. Puskas1,2

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

2 Department of Chemical and Biomolecular Engineering, The University of Akron, Akron, OH 44325-3906, USA

 

This article presents the synthesis and characterization of diblock, triblock, and tetrablock copolymers of alloocimene (Allo)​, a terpene from renewable resources, and isobutylene (IB) using the recently reported two-​phase living carbocationic system.  The addn. of a second Allo increment to diblocks of Allo and IB yielded triblock and tetrablock structures.  The block copolymers showedthermoplastic elastomeric (TPE) properties.  It is demonstrated that the unusual behavior of diblocks exhibiting TPE properties is due to the strain-​induced crystn. of the polyisobutylene block.  Thepolyalloocimene blocks can be cured, making this material a potential replacement of halobutyl rubber without halogen content.

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