Tuning the Viscosity Profiles of High-<i>T</i>_g Poly(1,2,3-triazolium) Covalent Adaptable Networks by the Chemical Structure of the N-Substituents

A designed library of covalent adaptable networks (CANs) having 1,2,3-triazolium dynamic cross-links are obtained through the combination solvent- and catalyst-free thermally induced azide–alkyne cycloaddition N-alkylation reactions. The use rigid heterocyclic or aromatic segments affords CANs with a greatly extended range thermomechanical profiles, Tgs up to 146 °C, dramatic changes in relaxation times (from 1.5 h less than 2 min at 150 °C) depending on chemical structure N-substituents cross-links, tunable rubbery plateaus, nearly constant elastic moduli ca. 160 °C. detailed correlation between rheological properties compositions these shows that dynamics mainly determined by independent both composition surrounding polymer corresponding Tg, temperatures ranging from Tg + 20 °C 180