Azacyclic monomers

Coordination polymerisation of heterocyclic monomers comprises polymerisation and copolymerisation processes of such monomers as oxacyclic monomers, especially epoxides [2,61-71], thiacyclic monomers like episulphides [72-76], azacyclic monomers [77,78] and phosphacyclic monomers [79]. Monomers with an exocyclic oxygen atom, such as cyclic esters like lactones [80-90] and lactide [90-92], cyclic acid anhydrides [93-98], cyclic carbonates [99,100] and related monomers, belong to oxacyclic monomers undergoing coordination polymerisation or copolymerisation. 

Azacyclic monomers containing an endocyclic nitrogen atom which are most commonly subjected to polymerisation in the presence of coordination catalysts include a-aminoacid /V-carboxyanhydrides. However, other monomers of this type, such as morpholine-2,5-dione, have also been subjected to coordination polymerisation. 

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