✍ Scribed by Ivan Gitsov; Iliya B. Rashkov; Ivan M. Panayotov
No coin nor oath required. For personal study only.
The initiation mechanism of the anionic polymerization of ϵ‐caprolactone (ϵ‐CL) under the action of the potassium graphitide KC~24~ was studied by ^1^H‐NMR spectroscopy of low molecular weight products of the polymerization. On the basis of the experimental results, the assumption was made that the initiation proceeds through a proton transfer from the monomer to the initiator. From the results of end group analysis it was assumed that the active centers of the growing polymer chain are of an alcoholate type. Comparative investigations were performed on the mechanism of ϵ‐CL polymerization under the action of anion‐radicals (potassium‐naphthylide) and alkali metals (K‐mirro). The results obtained showed that anion‐radicals initiate the polymerization predominantly via addition to the monomer and the pure alkali metals by proton transfer from the monomer to the initiator. The active centers of propagation in these systems were most probably of an alcoholate type in spite of the difficulties for direct proof of their nature.
📜 SIMILAR VOLUMES
## Abstract The influence of the reaction conditions (time, temperature, concentrations of the monomer, and the initiator) on the amount and composition of the oligomers and high molecular products formed during the heterogeneous anionic polymerization of ϵ‐caprolactone was investigated. The polyme