Fig. 3: Selective oxidation of the hindered thiourea bond.
From: Upcycling of dynamic thiourea thermoset polymers by intrinsic chemical strengthening
a The mechanical property of samples before and after thermal treatment (140 °C, 48 h) in nitrogen flow. b Infrared spectra of the thiourea network (without reprocessing) before and after thermal oxidization in air for 48 h at 140 °C. c Thermal oxidation (in air) induced mechanical property change of the thiourea network (without reprocessing). d Formation of different hydrogen bonding due to the oxidation.
