The S/DIB samples are synthesized with different weight percentages of DIB, namely 20, 25, 30, 40, and 50 wt %, following the method presented in Refs. 29 and 30. Elemental solid sulfur (99.5 %, Sigma Aldrich) is used without further treatment. Sulfur in the powder form is heated to 185 °C using a thermostated oil bath under the fume hood until a clear yellowish molten sulfur is formed. DIB (97 %, Sigma Aldrich) is passed through an activated, basic aluminum oxide column to remove 4-tert-Butylcatechol (TBC) as a stabilizer. Afterwards, pure DIB is directly added through a syringe to the molten sulfur. The mixture is stirred by a magnetic stir bar for 10 minutes at 185 °C to enhance the ring-opening polymerization of sulfur and to obtain chemically stable copolymers. Afterward, each sample is placed in a vacuum oven for approximately 15 minutes at 176 °C to complete the reaction and reduce the amount of remaining monomers. Then, they are cooled down to room temperature. Within a few minutes, this results in a vitrified red polymer. The samples are further investigated using NMR spectroscopy in order to confirm the formation of desired copolymers. Since low solubility of the S/DIB copolymers in organic solvents is a challenging factor, here we grind the samples using a mortar to increase sample surface, and then dissolve them in deuterated chloroform (CDCl 3 ) and place them in ultrasonication water bath to accelerate their solubility. 1 H NMR is carried out afterwards. Further information is provided in the Supplementary Information.