## 3 Results
\begin{table}
\begin{tabular}{c c c c} \hline
**Copolymeric** & **Specific Surface Area** & **Pore Volume** & **Pore Diameter** \\
**Microsphere** & \(S_{\text{BET}}\) **(m\({}^{2}\)/g)** & **V (cm\({}^{3}\)/g)** & \(D_{\text{BH}}\) **(Å)** \\ \hline DVB-co-ST & 418 & 0.440 & 50 \\ DVB-co-NVP & 746 & 1.045 & 100 \\ DVB-co-EGDMA & 417 & 0.801 & 158 \\ DVB-co-BMBB & 712 & 1.219 & 240 \\ DVB-co-BMPS & 416 & 0.693 & 240 \\ DVB-co-BMPM & 512 & 0.478 & 185 \\ \hline \end{tabular}
\end{table} 
Table 3: The main parameters of the porous structure of the copolymeric microspheres. final material had poly(DVB) regions of a high thermal stability. The remaining copolymers based on tetrafunctional monomers showed \(T_{5\%}\) in the 321-339 \({}^{\circ}\)C range. Among these copolymers, the least stable was the one based on the aliphatic monomer EGDMA. In general, this tendency followed the same pattern as for the other indicators. The values of \(T_{20\%}\) ranged from 336 to 389 \({}^{\circ}\)C, whereas \(T_{50\%}\) ranged from 374 to 484 \({}^{\circ}\)C (Table 4). Based on the data collected in an inert atmosphere, it could also be seen that in the case of copolymers synthesized with the use of ST, NVP, EGDMA, BMB and BMPM, the degradation process was conducted in two stages. However, the main mass loss was observed in the first one. The highest value of mass loss (89%) was observed for the copolymer where EGDMA was used as the aliphatic monomer. In the case of the DVB-_co_-BMPS copolymer, the second step was not observed in the measured temperature range. As a consequence, quite a high residual mass was noticed (14.0%). Figure 5 presents the TG and DTG curves obtained in helium for all copolymeric microspheres. In the first step, with a maximum at 346-421 \({}^{\circ}\)C, it is the functional groups that were mainly subjected to thermal degradation. Generally, the decomposition of methacrylate derivatives began with the degradation of the ester groups. Among the copolymers under study, four were methacrylate derivatives. From the literature, it follows that such materials can decompose according to the \(\alpha\)- and \(\beta\)-hydrogen bond scission. The products of the \(\alpha\)-hydrogen bond scission are mainly aldehydes and carboxylic acids, while from the \(\beta\)-hydrogen bond scission vinyl compounds are created [60]. When all copolymers were methacrylate derivatives, the FTIR spectra obtained at the first decomposition maximum showed absorption bands indicating the creation of both vinyl compounds (at ~910 and 990 cm\({}^{-1}\) and at 3095-3078 cm\({}^{-1}\) attributed to the C-H out-of-plane deformation and stretching vibrations, respectively) and carbonyl ones (at 1772-1770 cm\({}^{-1}\), connected with the C=O stretching vibrations), including aldehydes and esters. The existence of aldehydes was manifested by the bands at ~2820 and 2720 cm\({}^{-1}\), which were associated with the C-H stretching vibrations; however, the band at ~1125 cm\({}^{-1}\), characteristic of C-O stretching vibrations, was a sign that esters were present. Moreover, bands typical of carbon dioxide (at 2359-2310 cm\({}^{-1}\), attributed to asymmetric stretching vibrations and at 669 cm\({}^{-1}\), caused by degenerate bending vibrations), carbon monoxide (at 2181 and 2114 cm\({}^{-1}\), related to stretching vibrations) and water (at ~4000-3500 cm\({}^{-1}\), connected with stretching vibrations and at ~1800-1300 cm\({}^{-1}\) with bending vibrations) were visible. Figure 6 illustrates an example of the FTIR spectra of volatile products evolved during the thermal decomposition of DVB-_co_-EGDMA copolymer in the whole temperature range of the measurement (3D spectrum) and the temperatures of the maximum rate of mass loss.