Thermodegradable multisegmented polymer synthesized by consecutive radical addition-coupling reaction of α,ω-macrobiradicals and dithioester

摘要

A consecutive radical addition-coupling reaction involving dithioester is applied to produce thermodegradable multisegmented polymer using α,ω-dibromo polymer as precursor. The macroradical generated by single electron transfer process promoted by Cu/ligand from α,ω- dibromo polymer can efficiently add to ethyl dithiobenzoate, which results intermediate adduct radical. The in situ formed adduct radical immediately undergoes crosscoupling reaction with macroradical, generating segmented polymer bridged with C-S bond. The consecutive radical addition-coupling reaction generates multisegmented polymer linked by C-S bond following step-growth mechanism. The multisegmented polymer can be thermodegraded in the presence of hydrogen atom donor or air.