Polarized optical microscopy of 10 µm thick microtome cuts was performed, which reveals significant differences in the microstructure depending on the thiol crosslinkers incorporated into the polymer (Figure ). Using pure CHTT as comonomer, a colorful Schlieren texture reminiscent of a nematic liquid crystalline phase is observed, leading to our interpretation of "trapping" the liquid crystalline phase. This effect is also observed when mixtures of CHTT and ETTMP are studied. However, the texture appears to be much more finely distributed, leading to a grainy multicolored appearance. Higher crystallinity is identified through higher optical anisotropy in the purely CHTT-containing sample, which is signified by its lighter color under the crossed polarizers. With higher ETTMPcontent, the color appears darker as crystallinity decreases. Pure ETTMP as comonomer leads to a spotted texture with alternating crystalline and amorphous areas. We postulate this large spherulite texture as the reason for the samples' subpar tensile properties.