Synthesis of Block Copolymers by Olefin Metathesis Polymerization

Synthesis of Block Copolymers by Olefin Metathesis Polymerization 

A carbazole-functionalized norbornene derivative, 5-(N-carbazoyl methy-lene)-2-norbornene, CbzNB, was polymerized via ROMP using the ruthenium catalyst Cl2Ru(CHPh)[P(C6Hii)3]2 [100]. The polymerization was conducted in CH2CI2 at room temperature, to afford products with polydispersity indices close to 1.3. Subsequent addition of 5-[(trimethylsiloxy)methylene]-2-norbornene showed a clear shift of the SEC trace of the initial polymer, indicating that a diblock copolymer was efficiently prepared in high yield. 

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