*3.7. Microstructure*

Images of PGWP and PGWP-SIF obtained by transmission electron microscope (TEM) are presented in Figure 8. The morphology of the PGWP-SIF was related to the SIF contents. At the low SIF contents (Figure 8B,C), the microspheres were homogeneously spherical in shape with smaller particle size, suggesting that the nanoparticles were homogeneously dispersed. At the large SIF contents (Figure 8D,E), irregularly larger-sized particles were formed, and this may be due to the formation of inter-surface networks between the PGWP-SIF and unencapsulated SIF. The microstructure was consistent with the mean particle size obtained from dynamic light scattering data (Figure 2A).

**Figure 7.** The differential scanning calorimeter (DSC) curves of SIF, PGWP, and PGWP-SIF.

**Figure 8.** Transmission electron microscopy micrographs of PGWP and PGWP-SIF. PGWP (**A**); PGWP-SIF-A (**B**); PGWP-SIF-B (**C**); PGWP-SIF-C (**D**), and PGWP-SIF-D (**E**).
