but the viscosity did appear to increase somewhat over this time (Fig. ). The molecular weight of the target oligomers was approximately 800 g/mol, based on GPC analysis (Figs S7-S12). This result was consistent across accelerator loadings of 0, 1, and 5 wt%. The poly(S-r-limonene) with 5 wt% accelerator over 7 days was used for subsequent analysis and experiments. Simultaneous thermal analysis of this sample indicated a single mass loss starting at about 200 ºC and no melting transition of elemental sulfur was observed, which is consistent with complete reaction of elemental sulfur (Figs S13-S14). Consistent with this result, powder X-ray diffraction analysis revealed an amorphous material, absent of crystalline S8 (Figs. ). Even after prolonged storage of this product (10 months), no crystalline sulfur was observed to form-a common phenomenon observed for this class of polysulfide materials. Differential scanning calorimetry indicated a glass transition temperature of Tg = 8.6 ºC (Fig. ). Finally, combustible analysis was used to determine elemental composition, with C = 39.8%, H = 4.9%, S = 53.5%. For equal masses of limonene and sulfur, this is consistent with the expected values of C = 44.08%, H = 5.92%, S = 50.00%, suggesting good atom economy and negligible loss of mass through volatilisation of monomers or formation of H2S. The elemental composition also remained consistent from day 3 to 7 of the synthesis (Fig. ).