**5.1. Physical properties**

460 Polyurethane

**4.2. Thermal testing** 

385ºC. Charred residue was obtained after testing.

**Figure 6.** GC chromatogram of the RBD PKO-based polyol obtained at 175-180ºC for 30 minutes.

**Figure 7.** TGA thermogram of the RBD PKO-based polyol obtained at 175-180ºC for 30 minutes

The thermogram of the resulted RBD PKO-based polyol is as shown in Figure 7. Thermally, it is stable up to 167.6ºC and undergoes two stages decomposition at 167.6 to 406.3ºC with total weight loss of 99.41%. The initial 3.34% weight loss is contributed to the moisture content and other volatile impurities in the RBD PKO-based polyol (Oertel 1993). The initial decomposition is contributed by the degradation of RBD PKO-based polyol and traces of glycerol supported by the DTA curve which representing the softening temperature at The PKO-based polyurethane foam (PUF) produced is a light yellow solid with skin thickness of about 1.5 mm. It is a stiff/rigid but brittle solid at 43-44kg/m3 molded density and core density of 38-39 kg/m3 with average void size of 0.10-0.15 mm (Fig. 8).

**Figure 8.** Scanning electron micrograph of the PUF at 250 magnification
