This research finds that curing temperature influences crosslinking and mechanical properties in a vitrimer, indicating significant structural changes.
In this work, a vitrimer of polyethylene terephthalate was prepared through mixing with an epoxy and a polyol and curing. Different curing temperatures were utilized for preparation and the resulted characteristics were investigated. Curing temperature was found to highly affect the produced vitrimer. At high curing temperature, crosslinking was observed to be achieved successfully through different characterization methods. Differential scanning calorimetry DSC showed a single peak instead of dual peak known for PET. This proves disability of forming two populations of crystallites due to crosslinking. In addition, swelling test showed insoluble portion of the vitrimer, which indicated that crosslinking was obtained. Swelling in two different solvents were studied. On the other hand, at lower curing temperature, DSC showed dual peaks and tensile test showed lower tensile strength compared to precursor PET. Dynamic thermo-mechanical analysis did not show plateau after melting temperature, indicating non-networked structure.
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Amin et al. (2025) studied this question.
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