## 3 Results and Discussion
### Morphology of Studied Polymers
For this reason, in the PSD of DVB-GMA 2:1 db (Figure 6c), the main share is cont \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Pore-Forming Diluent** & **Polymer** & **S\({}_{\text{BET}}\) [m\({}^{2}\cdot\)g\({}^{-1}\)]** & **V\({}_{\text{tot}}\) [cm\({}^{3}\cdot\)g\({}^{-1}\)]** & **W [nm]** \\ \hline \multirow{4}{*}{toluene} & pDVB t & 534 & 0.56 & 5.5 \\  & DVB-GMA 2:1 t & 155 & 0.16 & 5 \\  & DVB-GMA 1:1 t & 38 & 0.07 & 7 \\  & DVB-GMA1:2 t & 12 & 0.03 & 11.6 \\ \hline \multirow{4}{*}{decanol and benzyl alcohol} & pDVB db & 396 & 1.05 & 12.3 \\  & DVB-GMA 2:1 db & 37 & 0.09 & 9.7 \\ \cline{1-1}  & DVB-GMA 1:1 db & 0.2 & 0.002 & 22.1 \\ \cline{1-1}  & DVB-GMA 1:2 db & 0.2 & 0.001 & 17.5 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Porous structure parameters of the studied polymers. Further information regarding the porous structure of the studied materials can be found in Figure 7, where the nitrogen sorption isotherms for two different diluent systems are presented. All the isotherms for the polymers prepared in toluene (Figure 7a) are of the same type and can be classified as IV (a). This type of isotherm is characteristic of mesoporous materials. The presence of hysteresis loops (H2(b)) indicates that capillary condensation occurs in mesopores with a width exceeding 4 nm. The shape of the loops is representative of materials with complex porous structure, in which cavities have a narrow size distribution and a neck-wide size distribution. The isotherm of pDVB db (Figure 7b) is quite different. It belongs to type V, with hysteresis resembling H3, observed for macroporous materials. In turn, DVB-GMA 2:1 db seems to combine features of both those discussed above. Its isotherm (Figure 7c) can be defined as IV(a), and the hysteresis loop resembles a combination of H2(b) and H5. Such a shape was reported for materials with irregular and complex networks of channels and cavities [31; 32]. The observed differences in the shapes of the isotherms confirm the distinct mechanism of polymerization described by [PERSON] [33] and [PERSON] et al. [34], governed by a type of pore-forming solvent. Figure 6: Pore size distribution curves of the obtained polymers in toluene (solid line) and decanol and benzyl alcohol (dotted line) as pore-forming diluents. PSD of polymers prepared with toluene (**a**); comparison of PSD for pDVB t and pDVB db (**b**); PSD of polymers prepared with mixture of alcohols (**c**). Methylene blue as a derivative of phenothiazzinium in the form of chloride salt is a basic dye, which readily reacts with negatively charged moieties through electrostatic interactions or by cation exchange. Other possible interactions include hydrogen bonding and \(\pi\)-stacking [35; 37]. Some data regarding MB are shown in Figure 9.  
The pDVB t, being composed mainly of aromatic rings and aliphatic chains, can interact with MB only through \(\pi\)-\(\pi\) interactions. The copolymers DVB-GMA, due to the presence of the GMA monomer, gain more hydrophilic characteristics than the homopolymer. For this reason, adsorption on the copolymers is also supported by other types of interactions. It should be kept in mind that the epoxide rings of GMA are able to chemically react with MB, leading to the opening of the epoxide ring and the formation of a substitution product. In this case, adsorption is localized. Breakthrough curves for the series prepared with a mixture of solvents (Figure 8b) do not show the same tendency as the previous one. This effect may be related to the very poorly developed porosity and broader PSD of these materials. In order to assess the influence of pore-forming diluents on the sorption properties, a comparison of the breakthrough curves of polymers with the same chemical composition should be performed. Figure 2 presents such comparative data. The homopolymers pDVB t and pDVB db (Figure 2a)) have very similar course of the curves, especially in the initial phase of the process.