## 3 Results and Discussion
### Microscale Combustion Calorimetry (MCC)  
On the basis of the microcalorimetry test, it was possible to obtain information on the heat release rate (HRR) as a function of temperature and time. The effect of introducing MMT in an amount of 3% by weight to the polyamide matrix was shown by the point of heat release rate (PHRR) value of 670.2 W/g. Of all the obtained results, this value was the highest. In addition, it was achieved at the same time and temperature as in the REF material. It may suggest that the introduction of nanofiller adversely affected the thermal effect of PA6 decomposition. However, the effect of achieving a higher peak on the HRR curve in relation to virgin polymer is often caused by the release of volatiles evolving through the decomposition \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Sample**} & **Burning** & **Length of the Burnt** & **Burning Rate** & **Number of** & **Type of** \\  & **Time (s)** & **Sample (mm)** & **(mm/min)** & **Drops** & **Standard Class** \\ \hline
**REF** & 40 & 27 & 41 & 22 & FV-2 \\
**5L** & 242 & 125 & 31 & 121 & - \\
**10L** & 47 & 31 & 40 & 32 & FV-0 \\
**15L** & 58 & 44 & 46 & 45 & FV-1 \\ \hline
**REFMMT** & 148 & 125 & 50 & 13 & - \\
**5 LMMT** & 86 & 125 & 87 & 12 & - \\
**10 LMMT** & 80 & 125 & 94 & 4 & - \\
**15 LMMT** & 66 & 125 & 114 & 4 & - \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Results of the UL-94 combustion carried out in a vertical position (VB) for the composites covered by using the LbL method. of low-molecular-weight organic compounds used for the MMT modification, such as ammonium salts [35]. The HRR curves of coated materials using the LbL method are shown in Figure 4. The adsorption of triple layers on the surface of a pure polyamide matrix did not contribute to a visible change in the PHRR value, because even for 15L material it is about 0.65%. However, a significant change in the time and temperature values of reaching the maximum heat release rate was observed. With the increase in the number of deposited layers, the peaks shifted towards lower temperatures. The difference between the material temperature values REF and 15L was 16 \({}^{\circ}\)C (Table 5). In addition, the time to reach the maximum point of the HRR curve for this material was decreased by 18 s. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Sample** & **PHRR (W/g)** & **Temperature to Reach PHRR (\({}^{\circ}\)C)** & **Time to Reach PHRR (s)** \\ \hline
**REF** & 613.6 & 473 & 422 \\
**5L** & 619.4 & 468 & 417 \\
**10L** & 618.8 & 472 & 424 \\
**15L** & 609.6 & 457 & 404 \\ \hline
**REFMMT** & 670.2 & 471 & 423 \\
**5 LMMT** & 533.3 & 469 & 409 \\
**10 LMMT** & 564.2 & 470 & 416 \\
**15 LMMT** & 504.4 & 468 & 415 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Point of heat release rate (PHRR) parameters for the materials coated utilizing the LbL method. Figure 4: Heat release rate (HRR) as a function of time of the polymeric materials coated using the LbL method: (**A**) the samples without nanofiller; and (**B**) the samples with nanofiller. The application of the triple layers to the reinforced aluminosilicate matrix of polyamide 6 resulted in a visible reduction in the rate of heat release. The introduction of 15 triple layers onto the surface of the nanocomposite reduced the PHRR value by 18% compared to a non-modified matrix with no significant effect at the temperature at which the PHHR was achieved. The effect of reducing the PHRR of this material was even greater when it was compared with the REFMMT sample (the observed flame-retardant effect was as high as 25%). The high temperature of the conducted study affected the total destruction of the protective barrier created. Whilst analyzing the course of all the pyrolysis and combustion microcalorimetry decomposition profiles, no changes in the shape of the peaks were observed. The application of 5-15 triple layers by LbL on a pristine PA6 matrix did not have a visible effect on reducing the maximum heat release rate.