Polymerisation of Allyl Compounds

Abstract

The review deals with the advances in the theory of the formation of allyl polymers and their practical applications. Untilrecently there was only limited interest in allyl polymers because with the usual free-radical initiation allyl compoundspolymerise with difficulty and yield polymers with a low molecular weight. The principal cause of the formation of low-molecular-weight polymers is degradative chain transfer to the monomer, as a result of which the kinetic chain is terminated.A property of the degradative chain transfer is the constancy of dM/dP, i.e. a linear relation between the amount of peroxidedecomposed and the amount of monomer polymerised. In addition to degradative chain transfer, a characteristic feature ofallyl monomers is effective chain transfer, which depends on the structure of the monomer. The polymerisation of diallyl compounds has a cyclolinear mechanism, which leads to the formation of macromolecules withalternating cyclic and linear units. The behaviour of allyl monomers in copolymerisation reactions is determined by their low reactivity compared with that ofthe majority of vinyl monomers. The chemical structure of allyl monomers does not as a rule have a significant influence ontheir reactivity. In recent years polymers based on allyl monomers have found many applications in engineering. Copolymerisation withother monomers and polymers yielded materials with high mechanical strength, thermal and chemical stability, and goodinsulating and adhesive properties. They are used as fibres, films, coatings, optical glasses, binders for reinforced plastics,etc. The bibliography includes 386 references.