Rheological Characteristics of Cross-Linked Materials with Associative Bond Exchange Mechanisms

Vitrimers are a new class of sustainable cross-linked materials with an associative bond exchange mechanism. Bond in vitrimers functions addition/elimination pathway, where dissociation and reassociation appear to occur simultaneously, as opposed traditional dynamic covalent bonds that act discrete distinct, separated steps reassociation. Because these characteristics, network disconnection never occurs vitrimers, topology alternation proceeds maintaining the constant cross-link density at temperature greater than activation exchange. Some unique rheological properties highlighted this review article. The first section summarizes general relaxation features vitrimer networks based on temperature-ramp creep test, stress-relaxation temperature-sweep viscoelasticity. applicability or inapplicability time-temperature superposition concept is examined latter section, which vital for understanding thermorheological simplicity (or complexity) materials.