The 25th anniversary of catalytic chain transfer

✍ Scribed by Alexei Gridnev

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 229 KB
• Volume: 38
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(20000515)38:10<1753::aid-pola600>3.0.co;2-o

✦ Synopsis

The transfer of hydrogen from a free radical to an olefin is catalyzed by some cobalt chelates. This reaction, when used in free-radical polymerization, can be called catalytic chain transfer (CCT) to a monomer. It allows the manufacture of oligomers that have defined molecular weights and are useful for a variety of applications. Because all the oli-gomers are getting terminal double bonds, they can behave as macromers. These macromers give rise to the formation of diblock and graft copolymers, telechelic polymers that have the same or different functional groups depending on the conditions and origins of the comonomers. The catalyst structure-property relation is discussed. Redox properties affect the CCT and provide additional leverage in controlling polymerization processes.