Bio-Based Polyols from Seed Oils for Water-Blown Rigid Polyurethane Foam Preparation

Figure 4

SEM micrographs of resulting PUR foams in top view (upper) and side view (lower) of mold (50x): (a) sesame seed oil-based, (b) pumpkin seed oil-based, and (c) Raypol® 4218-based foams.

(a)

(b)

(c)