Chain Transfer in the Ring-Opening Metathesis Polymerization of Cyclooctadiene Using Discrete Metal Alkylidenes

Marc A. Hillmyer, Robert H. Grubbs

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

The ring-opening metathesis polymerization of cyclooctadiene (COD) in the presence of a difunctional chain transfer agent (CTA) was investigated. The effect of the CTA structure and choice of metathesis catalyst on the overall efficiency of the polymerization reaction is discussed. A separation of the oxygen functionality from the olefin in the CTA by two methylene units significantly enhances the stability of the discrete, tungsten-based metathesis catalyst used for these polymerizations. Furthermore, a more robust well-defined metathesis catalyst based on molybdenum was more effective than the tungsten-based catalyst. The preparation of low-molecular-weight hydroxytelechelic polybutadienes with one type of regiochemistry, number-average functionalities that approach 2.0, and in high yield was accomplished.

Original languageEnglish (US)
Pages (from-to)8662-8667
Number of pages6
JournalMacromolecules
Volume28
Issue number25
DOIs
StatePublished - Dec 1 1995

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