Heterocyclic monomers homopolymerisation

As regards the coordination homopolymerisation of heterounsaturated monomers, it does not play such an important role as in the case of heterocyclic monomers (with the exception of carbon monoxide). This is because of the high polymerisability of heterounsaturated monomers in the presence of ionic initiators which is taken into account in some industrial processes (e.g. polyformaldehyde). 

The data presented in Tables 9.1 and 9.2 focus on homopolymerisations copolymerisations of the mentioned heterocyclic monomers of both types proceed similarly, involving catalysts that promote their homopolymerisations. 

Table 9.1 Homopolymerisation of heterocyclic monomers, containing an endocyclic heteroatom, in the presence of coordination catalysts 2...

However, the most important goal that might be reached by the application of coordination catalysts for the polymerisation of heterounsaturated monomers is the possibility of the enchainment of heterounsaturated monomers, not susceptible to homopropagation, via their copolymerisation with heterocyclic monomers. This concerns primarily the coordination copolymerisation of carbon dioxide and oxacyclic monomers such as epoxides, leading to aliphatic polycarbonates [8 12]. Representative examples of the copolymerisations of heterocyclic monomers and hardly homopolymerisable heterocumulenes, in the presence of coordination catalysts, are listed in Table 9.4 [1]. 

Heterocyclic This designates a closed-ring structure, usually 5-membered or 6-membered, in which one or more of the atoms in the ring is an element other than carbon (e.g. sulphur, nitrogen, etc.). Homopolymerisation The process of formation of synthetic high polymers from a single monomer. 

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