As shown in Fig. 2c and d, after removing the PLA phase in the surface layer, the remained NR phase emerges as a continuous “net-like” structure, which breaks the traditional concept that the sea-island morphology formed after dynamic vulcanization of blends.
Although the results gave us so much surprise, the SEM result of the dichloromethane-etched surface is quite consistent with the TEM and cryo-fracture surface SEM observations.