Abstract
It has been shown that cationic cyclopolymerization with formation of soluble polymers with the degree of cyclization above 95% may be undertaken for divinyl ethers of mono-, tri- and tetraethylene glycol using BF 3·O(CH 3) 2 as initiator. Favourable conditions for cyclopolymerization were created by lowering the initial concentration of the monomers to 0·1 mole/1. and below. The polymer analogues of the crown ethers obtained and containing in the main chain macrocycles of the crown-2, crown-4 and crown-5 types are soluble in the vast majority of organic solvents and in water.
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