3.2.1. Differential Scanning Calorimetry

DSC was used to investigate whether polymorphic changes had occurred when manufacturing the NCC and the resultant thermogram is depicted in Figure 4. The thermogram revealed a melting endotherm for the OPT-NCC with a Tpeak at 94.3 ◦C and for the uncoated NCC at Tpeak at 103.1 ◦C. The reduction in melting point is likely due to particle size reduction [51–53]. The NCC has a narrow melting endotherm, indicating that crystallinity is retained during the production process. Tabulated melting point data are reported in Table S1 and the thermograms for the components and the NCC are depicted in Figure S1 in the Supplementary Information.

**Figure 4.** DSC thermograms depicting the melting endotherm for the uncoated (black) and OPT-NCC (orange).
