## 3 Results
The measured decomposition initiation temperature was almost identical, and the enthalpy of the decomposition process was the lowest among the analyzed samples (\(-332\) J/g). Unlike a 50% mixture, this reaction was not potentially explosive (Figure 8). Poly(methyl methacrylate) (PMMA), also known as organic glass, is another polymer for which a risk of an explosive reaction in contact with AN can be noticed. As in the case of most of the tested polymers, the strongest explosive decomposition effect was observed for the 20% mixture. This reflected both the value of the maximum heat flux produced and the measured maximum reaction enthalpy of \(-799\) J/g for the 20% mixture. Contrary to the previously described substances, no decrease in the temperature of the decomposition reaction was observed, but its slight increase, to 285.2 \({}^{\circ}\)C, occurred instead. This was largely due to the fact that PMMA began to melt in a temperature range close to the decomposition temperature. For this reason, a liquid explosive mixture was formed at a temperature close  
Figure 8: DSC analysis of AN, PMMA, and their mixture (20%), heat rate 10 \({}^{\circ}\)C/min. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Polymer Percentage** & **Initiation Temperature of** & **Enthalpy of Reaction [J/g]** \\
[\%] & **Reaction [\({}^{\circ}\)C]** & **Enthalpy of Reaction [J/g]** \\ \hline
8 & 242.1 & \(-450\) \\
20 & 245.9 & \(-762\) \\
50 & 281.5 & \(-547\) \\
75 & 243.5 & \(-332\) \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Results of DSC analysis of AN and soft PS mixture with different proportions. to the decomposition temperature of pure AN. This can significantly affect the behavior of the mixture during faster heating due to thermal inertia. The shape of the DSC graph also indicated a two-step mechanism for decomposition reaction of the mixture (Figure 9). Contrary to the previously described substances, explosive properties were observed in the case of a mixture containing 8% by weight of polymer. The enthalpy of the decomposition reaction was \(-681\) J/g. Due to the abovementioned high melting point of PMMA, the initiation of the decomposition reaction did not change significantly and took place at a temperature of about 287 \({}^{\circ}\)C. The temperature was slightly reduced (280.8 \({}^{\circ}\)C) for a mixture containing 50% of polymer. For PMMA, the enthalpy of the decomposition reaction was the lowest among the measured polymers and amounted to \(-629\) J/g (Table 4). Clear splitting of chemical reactions constituting the stages of the decomposition reaction was noteworthy. The results of the measurements showed that, for each of the analyzed polymer contents in the mixture, its thermal decomposition was explosive (Figure 10). \begin{table}
\begin{tabular}{c c c} \hline \hline \multirow{2}{*}{**Polymer Percentage [\%]**} & **Initiation Temperature of Reaction [\({}^{\circ}\)C]** & **Enthalpy of Reaction [J/g]** \\ \hline
8 & 287.0 & \(-681\) \\
20 & 285.2 & \(-799\) \\
50 & 280.8 & \(-629\) \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Results of DSC analysis of AN and soft PMMA mixture with different proportions. \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Polymer Percentage [\%]**} & **Initiation Temperature of Reaction (A) [\({}^{\circ}\)C]** & **Enthalpy of Reaction (B)** [\({}^{\circ}\)C] & **Enthalpy of Reaction (J/g]** \\ \hline
8 & 205.5 & \(-654\) & - & - \\
20 & 209.8 & \(-1033\) & 233.0 & \(-387\) \\
50 & 198.7 & \(-1095\) & - & - \\
75 & 200.1 & \(-978\) & - & - \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Results of DSC analysis of AN and PA mixture with different proportions. Figure 9: DSC analysis of AN and PMMA mixture composition influence on their thermal properties, heat rate 10 \({}^{\circ}\)C/min. Another analyzed polymer is polyamide. PA66 was chosen as the model polymer. The decomposition of the 20% mixture took place in a multi-step manner. There were two main steps in this process.