Abstract
Novel thermoplastic elastomers (TPEs) containing a central rubbery polyisobutylene (PIB) and glassy outer polyindene (PIn) segments have been prepared by living carbocationic polymerization by sequential monomer addition. The synthesis conditions for TPEs were developed with the help of model experiments using the 2-chloro-2,4,4-trimethylpentane (TMPCl)/TiCl 4 initiating system and subsequent PIn-b-PIB-b-PIn triblock syntheses. These copolymers exhibited microphase separation, good thermal stability and ease of melt processability. Tensile strengths, 300 % moduli and hardness increased with increasing polyindene content, while percent elongations decreased
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