Synthese de polymeres possedant des fonctions du type carbonate-alcool et thiol carbonate-alcool en extremites de chaines

Anionic polymerization permits the synthesis of polymers having various functional endgroups by deactivation of living polymers with the aid of electrophiles. These functional end-groups, as in the case of low molecular weight polymers, are easily accessible to reagents and can be subjected to chemical modification. Using this method, it is possible to obtain oligomers carrying functional end-groups of types which cannot be created by direct polymerization. This technique was applied to the synthesis of polydienes having carbonate alcohol and thiolcarbonate alcohol functional end-groups. These end functions were obtained by chemical modification of existing alcohol groups. In order to specify the experimental conditions, a model study of such a reaction was carried out. The polymers and their models are characterized by NMR, i.r. and physico-chemical measurements. This type of chemical modification leads to prepolymer having easily hydrolysed carbonate and thiolcarbonate linkages, reactive points for the subsequent degradation of the corresponding reticulated systems.