## 3 Results
The same pattern can be noted for the copolymers with molar ratio of comonomers equals to 1:4. The pores are slightly smaller, but the described tendency is preserved. What is important, the reduced diameter of the pores contributes to more developed internal structure (Table 2). What is more, the application of chlorobenzene in the synthesis of porous copolymers gave rise to further increases in the main parameters characterizing the porous structure. This phenomenon is connected with the better solvation power of chlorobenzene compared with toluene. Its Hildebrand solubility parameter is equal to 19.6 (MPa)\({}^{0.5}\) whereas this of toluene is 18.2 (MPa)\({}^{0.5}\). \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Copolymer**} & **Specific Surface Area** & **Pore Volume** & **Pore Diameter** \\  & \(\mathbf{S_{BET}}\) **(m\({}^{2}\)/g)** & \(\mathbf{V}\) **(cm\({}^{2}\)/g)** & \(\mathbf{D_{B\!H}}\) **(nm)** \\ \hline BMA-_co_-EGDMA\_1\_T & 134.30 \(\pm\) 0.34 & 0.1641 \(\pm\) 0.0012 & 40 \\ BMA-_co_-EGDMA\_1\_C & 220.49 \(\pm\) 0.36 & 0.6299 \(\pm\) 0.0009 & 3.9 \\ BMA-_co_-EGDMA\_4\_T & 220.91 \(\pm\) 0.48 & 0.5953 \(\pm\) 0.0021 & 37 \\ BMA-_co_-EGDMA\_4\_C & 411.94 \(\pm\) 0.99 & 0.6410 \(\pm\) 0.0005 & 4.1/11 \({}^{*}\) \\ \hline BMA-_co_-DVB\_1\_T & 252.32 \(\pm\) 0.64 & 0.2028 \(\pm\) 0.0011 & 3.5 \\ BMA-_co_-DVB\_1\_C & 384.28 \(\pm\) 0.14 & 0.4099 \(\pm\) 0.0008 & 4 \\ BMA-_co_-DVB\_4\_T & 358.13 \(\pm\) 0.57 & 0.2398 \(\pm\) 0.0009 & 2.5 \\ BMA-_co_-DPB\_4\_C & 412.34 \(\pm\) 0.71 & 0.4110 \(\pm\) 0.0015 & 4.8/17 \({}^{*}\) \\ \hline BMA-_co_-TRIM\_1\_T & 265.46 \(\pm\) 0.42 & 0.3327 \(\pm\) 0.0036 & 3.6/15 \({}^{*}\) \\ BMA-_co_-TRIM\_1\_C & 440.34 \(\pm\) 0.31 & 0.7309 \(\pm\) 0.0004 & 3.5/12 \({}^{*}\) \\ BMA-_co_-TRIM\_4\_T & 335.93 \(\pm\) 0.44 & 0.4618 \(\pm\) 0.0022 & 10 \\ BMA-_co_-TRIM\_4\_C & 472.36 \(\pm\) 0.29 & 0.7498 \(\pm\) 0.0007 & 8.5 \\ \hline \hline \end{tabular} \({}^{*}\)bimodal pore size distribution.  
\end{table} 
Table 2: Parameters characterizing porous structure of the copolymeric microspheres. Generally, the formation of porous materials was possible thanks to the application of the suspension technique in the synthesis. The characteristic feature of the suspension technique is the fact that the size and size distribution of the obtained microspheres depends on many polymerization factors (the diameter of a stirrer and a flask, the volume ratio of the water phase to the organic phase, the mixing power and the stabilizer concentration) [61]. Due to the chemical diversity of monomers, differences in organic phase densities were observed, and consequently, different interfacial tension was present. This phenomenon was evident in the synthesized microspheres size. The mass median diameter of BMA-_co_-DVB copolymers did not exceed 100 \(\upmu\)m. The use of methacrylate comonomers results in microspheres of larger size. The diameters of BMA-_co_-EGDMA copolymers are in the range 89-184 \(\upmu\)m, whereas BMA-_co_-TRIM copolymers in the range 76-217 \(\upmu\)m depending on the molar ratio of the monomers and the used solvent. The detailed data of particle size and particle size distribution are collected in Table 3.  
The referred differences are also clearly visible in Figure 5. The SEM images show the regular shape of the synthesized microspheres and confirm the data obtained using laser diffraction. Figure 4: Pore size distribution for selected copolymers.