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Photoexcitation of Grubbs’ Second-Generation Catalyst Initiates Frontal Ring-Opening Metathesis Polymerization

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journal contribution
posted on 20.10.2020, 15:08 by Katherine J. Stawiasz, Justine E. Paul, Kevin J. Schwarz, Nancy R. Sottos, Jeffrey S. Moore
In this work, a simple method is reported for control over initiation in frontal ring-opening metathesis polymerization (FROMP). This noncontact approach uses 375 nm light to excite Grubbs’ second-generation catalyst in the presence of a phosphite inhibitor. Photoinitiated FROMP of dicylcopentadiene (DCPD) displays a similar cure profile to that of its thermally initiated counterpart, yielding a robust polymer with high glass transition temperature. Furthermore, this system is applied to enhance reaction rates in conventional ring-closing metathesis reactions.