Since the cross-linked NR in the present blend is not dispersed particles but a continuous net-like structure, the
study of the NR phase in a stretched sample will contribute to better understand the super toughness of the blend.
In our experiment, the longitudinal stretching surface of the stretched D65/35 specimen was etched with dichloromethane
to remove the PLA phase in the surface layer.
The SEM micrographs of the etched surface are shown in Fig. 6a.