## 3 Results and Discussion
### Differential Scanning Calorimetry
\begin{table}
\begin{tabular}{l c c c c c c c c c c c c} \hline \hline  & \multicolumn{4}{c}{**Peak P1**} & \multicolumn{4}{c}{**Peak P2**} & \multicolumn{4}{c}{**Peak P3**} \\ \cline{2-13}
**Foam** & **T\({}_{\text{onset}}\)**, & **T\({}_{\text{max1}}\)** & **T\({}_{\text{KI}}\)** & **H\({}_{\text{1}}\)** & **T\({}_{\text{onset2}}\)** & **T\({}_{\text{max2}}\)** & **T\({}_{\text{K2}}\)** & **H\({}_{\text{2}}\)** & **T\({}_{\text{onset3}}\)** & **T\({}_{\text{max3}}\)** & **T\({}_{\text{K3}}\)** & **H\({}_{\text{3}}\)** \\  & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)C) & (\({}^{\circ}\)/g) \\ \hline W\_0t & 21.7 & 71.8 & 146.6 & 25.8 & 278.6 & 294.8 & 325.3 & 44.9 & 326.3 & 330.4 & 347.3 & 5.1 \\ C5\_0t & 44.6 & 82.3 & 131.4 & 26.5 & 266.0 & 285.9 & 316.6 & 28.0 & 330.2 & 335.9 & 351.6 & 4.6 \\ C10\_0t & 46.7 & 86.4 & 139.4 & 33.4 & 261.9 & 274.5 & 319.1 & 35.6 & 324.0 & 329.8 & 352.7 & 6.1 \\ C15\_0t & 46.7 & 85.6 & 140.8 & 36.5 & 262.6 & 271.0 & 314.4 & 30.8 & 327.1 & 333.2 & 357.7 & 8.9 \\ W\_1t & 54.7 & 91.3 & 179.8 & 41.8 & 271.5 & 289.0 & 314.4 & 19.0 & 318.2 & 323.6 & 342.2 & 4.7 \\ C5\_1t & 39.7 & 93.9 & 133.9 & 47.5 & 259.7 & 285.3 & 313.0 & 13.8 & 331.2 & 337.5 & 358.8 & 5.2 \\ C10\_1t & 40.1 & 94.0 & 140.0 & 50.0 & 249.7 & 271.2 & 310.4 & 15.5 & 329.6 & 334.1 & 342.5 & 7.1 \\ C15\_1t & 47.4 & 94.4 & 142.2 & 53.0 & 244.8 & 267.3 & 305.8 & 17.8 & 323.0 & 333.4 & 363.2 & 11.1 \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Values of thermal transformations of foams series C (with flame retardant) using the DSC. 0t—foams before degradation, 1t—foams after 1-week degradation. Figure 6: DSC curves of foams modified by cinnamon extract: (**a**) C_0t series; (**b**) series C_1t; (**c**) series CU_0t; and (**d**) series CU_1t. Subjecting the foams (CU_1t series) to a 1-week degradation was shown of the T\({}_{\text{max}}\) peaks going towards higher temperatures, e.g., for P1 peak from 81.2 \({}^{\circ}\)C (CU15_0t) to 91.0 \({}^{\circ}\)C (CU15_1t), for P2 peak with 282.3 \({}^{\circ}\)C (CU15_0t) up to 325.2 \({}^{\circ}\)C (CU15_1t) in Table 11.  
Degradation of the reference foam WU_0t (without cinnamon extract, without flame retardant) resulted in the disappearance of the endothermic peak of the WU_1t foam (Figure 6c,d). In the CU_1t foam series (Figure 5d), pronounced endothermic peaks were observed at temperatures above 300 \({}^{\circ}\)C for CU5_1t, CU10_1t, CU15_1t foams. Any endothermic peak was not observed for WU_1t, at approximately 300 \({}^{\circ}\)C. The disappearance of the first exothermic P2 peak was also observed in the temperature range from 265 \({}^{\circ}\)C to 300 \({}^{\circ}\)C (occurring in the C_0t and C_1t series containing the flame retardants; Figure 6a,b) relative to the series without flame retardant (CU_0t and CU_1t, Figure 6c,d). The second exothermic peak P3, was preserved. The changes in the peaks observed in Figure 6c,d could indicate the breakdown of urethane bonds (with dissociation temperature of 200 \({}^{\circ}\)C) and ether (with dissociation temperature of 260 \({}^{\circ}\)C) [47; 48; 49; 50]. The presence of the P3 peak on the DSC curve suggested the lack of climatic influence on the PUR/PIR foam degradation (with dissociation temperature of 350 \({}^{\circ}\)C) in CU_1 series, what could be observed on FTIR of CU_1t series of foams; see Figure 4b.