Abstract
Selective anionic ring-opening of carbonate monomer (65CC) containing five- and six-membered cyclic carbonate moieties was carried out to obtain a polycarbonate carrying five-membered carbonate structure in the side chain (poly65CC). The reaction of the obtained polymer with monoamines was examined to give predominantly polycarbonate bearing hydroxyurethane moiety in the side chain through the addition of five-membered carbonate with amines. Based on these model reactions, selective reaction of five-membered carbonate in the side chain of poly65CC and hexamethylenediamine was carried out to form a network polymer through hydroxyurethane linkages. In the presence of 1,8-diazabicyclo[5.4.0]-7- undecene (DBU), under a dilute condition, depolymerization of the main chain of the networked polycarbonate proceeded to regenerate the original monomer 65CC with five- and six-membered carbonate structures.
