Preparation and Sound Insulation Performance of Superfine Metal Powder/Nitrile-Butadiene Rubber-Polyvinyl Chloride Microcellular Foaming Material

Figure 4

SEM images of fractured surface of SFM/NBR-PVC materials and SFM: (a) 0 wt%, (b) 10 wt%, (c) 30 wt%, (d) 40 wt%, (e) SFM.

(a)

(b)

(c)

(d)

(e)