“…In recent years, numerous studies have investigated PHU synthesis with strong emphasis on the production of single-phase PHUs, crosslinked PHU networks, reaction catalysis and the synthesis of carbonate monomers . For example, Endo and coworkers [14][15][16][17][18][19][20][21][22][23], as well as others [24][25][26][27][28][29], synthesized PHUs from carbonated epoxy resins (such as Bisphenol A diglycidyl ether, hydroquinone diglycidyl ether, and butanediol diglycidyl ether) and small-molecule diamines (such as hexamethylene diamine) resulting in single-phase PHUs [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. The reaction kinetics of five-, six- [17][18][19]51], seven- [20] and eight-membered ring carbonates [12], the influence of substituent on reactivity [21,52], and the effects of catalysts [22,[30][31][32] were also characterized.…”