Catalytic Production of Olefin Block Copolymers via Chain Shuttling Polymerization

We report a catalytic system that produces olefin block copolymers with alternating semicrystalline and amorphous segments, achieved by varying the ratio of α-olefin to ethylene in the two types of blocks. The system uses a chain shuttling agent to transfer growing chains between two distinct cataly...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2006-05, Vol.312 (5774), p.714-719
Main Authors: Arriola, Daniel J., Carnahan, Edmund M., Hustad, Phillip D., Kuhlman, Roger L., Wenzel, Timothy T.
Format: Article
Language:English
Subjects:
Alkenes
Applied sciences
Block copolymers
Catalysts
Copolymerization
Copolymers
Exact sciences and technology
Materials
Molecular chains
Molecular weight
Monomers
Organic polymers
Physicochemistry of polymers
Polymerization
Polymers
Preparation, kinetics, thermodynamics, mechanism and catalysts
Research Article
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Summary:We report a catalytic system that produces olefin block copolymers with alternating semicrystalline and amorphous segments, achieved by varying the ratio of α-olefin to ethylene in the two types of blocks. The system uses a chain shuttling agent to transfer growing chains between two distinct catalysts with different monomer selectivities in a single polymerization reactor. The block copolymers simultaneously have high melting temperatures and low glass transition temperatures, and therefore they maintain excellent elastomeric properties at high temperatures. Furthermore, the materials are effectively produced in economically favorable, continuous polymerization processes.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1125268