Dielectric relaxations in poly(glycidyl phenyl ether): Effects of microstructure and cyclic topology

摘要: Cyclic and linear, isoregic aregic, isotactic atactic poly(glycidyl phenyl ether) (PGPE) with molecular weights up to Mw = 5.5 kg/mol are synthesized by ring-opening polymerization of glycidyl ether. Initiation tetrabutylammonium fluoride leads linear polymers ∼95% regular linkages, initiation B(C6F5)3 B(C6F5)3/water aregic cyclic polymers, respectively, ∼50% linkages as quantified 13C NMR. Local, segmental, chain dynamics in PGPE is investigated broadband dielectric spectroscopy (10–2–106 Hz). The β-relaxation for separated into two contributions arising from the motions side groups end activation energies 35.4 23.8 kJ/mol, respectively. process shows same energy that shown side-group contribution PGPE, indicating topology does not play a key role on local dynamics. Moreover, cyclic...