Mixture Design Approach on the Physical Properties of Lignin-Resorcinol-Formaldehyde Xerogels

Figure 2

Contour plots for shrinkage: (a) mass ratio 1.5; (b) mass ratio 1.4.

(a) Resorcinol = 0.3, formaldehyde = 0.2

(b) Resorcinol = 0.261, formaldehyde = 0.182