2.3. A General Procedure for Copolymerization of Allyl Disulfide and Cyclooctene

A 10 mL Schlenk flask with a magnetic stir bar was dried in an oven at 120 °C and then allowed to cool inside a glovebox. Next, the diallyl disulfide, cyclooctene, and 0.8 mL dry solvent were added into the Schlenk flask, and the flask was sealed with a rubber plug. Grubbs catalyst was then dissolved in corresponding dry solvent (0.2 mL) in a vial flask and the solution was added into the Schlenk flask via a syringe. The resulting solution was stirred for 1 h at ambient temperature and then quenched with methyl alcohol. The polymerization mixture was precipitated into 80 mL methyl alcohol, and the solid was obtained by filtration and dried under vacuum at room temperature for 4 h to obtain the required polymer. The polymer structure was determined by NMR spectrogram analysis. The insertion rate of diallyl disulfide was determined by ¹H-NMR analysis according to the following equation:

The molecular weight and polydispersity were determined by size-exclusion chromatography.