| 초록 |
Vitrimers, a new class of crosslinked polymer, can be self-healed and heat-processesed, ascribing to thermally activated bond exchanges at temperatures above topology freezing temperature, Tv. Previous literature reports the Tv as a value influenced mainly by the exchange chemistry; however, other studies also report significant inconsistencies when measuring Tv. Moreover, stress relaxation experiment for identifying Tv and parameters related to the exchange kinetics such as activation energy and reaction rate constant may not always work properly, especially for strong vitrimers. In this poster, thus, we report a unique data interpretation method to analyze time-temperature superposition shift factor from rheological measurements, allowing for identification of Tv and the bond exchange kinetic parameters. Such fundamental understandings will inform future design of vitrimers toward various applications ranging from recyclable thermosets to structural adhesives. |
