TELOMERIZATION OF VINYL ETHERS AND THEIR COTELOMERIZATION WITH FLUORINATED MONOMERS

Radical cotelomerization of vinylic ethers VE (butyl vinyl ether and 2-acetoxy ethyl vinyl ether) with chlorotrifluoroethylene and mercaptans (2-hydroxy ethyl mercaptan and C6F13C2H4SH) are studied. The homo-telomerization of vinylic ethers with these thiols and CCl3CH2OH leads to complex mixtures including acetals obtained by addition of the VE to hydroxy groups after telomerization of the thiol with the vinyl ether. Cotelomerization is similar, but we have also shown that the transfer activity of the thiols on all radical species bearing a vinyl ether end is very important and leads almost solely to monoadditions consuming large quantities of thiol. We deduce therefore, that in these reactions, we obtain mixtures of copolymers (formed after total consumption of the thiol) and of these adducts having a low molecular weight.