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Multiblock Copolymers Based on Highly Crystalline Polyethylene and Soft Poly(ethylene-co-butadiene) Segments: Towards Polyolefin Thermoplastic Elastomers |
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| Authors: | Dr. Marvin Langlais Dr. Nicolas Baulu Dr. Séverin Dronet Dr. Charlotte Dire Dr. François Jean-Baptiste-dit-Dominique Dr. David Albertini Dr. Franck D'Agosto Dr. Damien Montarnal Dr. Christophe Boisson |
| Affiliation: | 1. Université Claude Bernard Lyon 1, CPE Lyon, CNRS UMR 5128, Laboratoire CP2M, Equipe PCM, 69616 Villeurbanne, France;2. Université Claude Bernard Lyon 1, CPE Lyon, CNRS UMR 5128, Laboratoire CP2M, Equipe PCM, 69616 Villeurbanne, France Manufacture Michelin, 23 place Carmes Déchaux, 63000 Clermont-Ferrand, France;3. Manufacture Michelin, 23 place Carmes Déchaux, 63000 Clermont-Ferrand, France;4. Université Claude Bernard Lyon 1, INSA Lyon, CNRS UMR 5270, Institut des Nanotechnologies de Lyon, 69616 Villeurbanne, France |
| Abstract: | Block copolymers based on polyethylene (PE) and ethylene butadiene rubber (EBR) were obtained by successive controlled coordinative chain transfer polymerization (CCTP) of a mixture of ethylene and butadiene (80/20) and pure ethylene. EBR-b-PE diblock copolymers were synthesized using the {Me2Si(C13H8)2Nd(BH4)2Li(THF)}2 complex in combination with n-butyl,n-octyl magnesium (BOMAG) used as both the alkylating and chain transfer agent (CTA). Triblock and multiblock copolymers featuring highly semi-crystalline PE hard segments and soft EBR segments were further obtained by the development of a bimetallic CTA, the pentanediyl-1,5-di(magnesium bromide) (PDMB). These new block copolymers undergo crystallization-driven organization into lamellar structures and exhibit a variety of mechanical properties, including excellent extensibility and elastic recovery in the case of triblock and multiblock copolymers. |
| Keywords: | Block Copolymer Butadiene Ethylene Polyolefin Thermoplastic Elastomers |