# Synthesis and Porous Structure Characteristics of Allyl Methacrylate/Divinylbenzene Polymers
## 3 Results and Discussion
### Effects of Various Solvents on the Porous Structure of AllMeth/DVB  
If the crosslinking in AllMeth/DVB polymers has two components--the vinyl one and the allyl one, the latter one should be much more flexible as it was presented in [27], where \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Sample** & **Synthesis** & **Pore Volume** & **Average Pore Size** & **Specific Surface Area** & **Micropore Area** & **Micropores Median Pore Width [Å]** \\ \hline \multirow{3}{*}{Resin 1} & 50\% DVB * & \multirow{3}{*}{0.70} & \multirow{3}{*}{5.9} & \multirow{3}{*}{478} & \multirow{3}{*}{112} & \multirow{3}{*}{8.5} \\  & 47.5\% Allyl & & & & & \\  & methacrylate & & & & & \\ \hline \multirow{3}{*}{Resin 2} & 40\% DVB * & \multirow{3}{*}{0.67} & \multirow{3}{*}{6.1} & \multirow{3}{*}{446} & \multirow{3}{*}{110} & \multirow{3}{*}{8.5} \\  & 50.0\% Allyl & & & & & \\  & methacrylate & & & & & \\ \hline \multirow{3}{*}{Resin 3} & 30\% DVB * & \multirow{3}{*}{0.58} & \multirow{3}{*}{5.7} & \multirow{3}{*}{410} & \multirow{3}{*}{120} & \multirow{3}{*}{8.8} \\  & 62.5\% Allyl & & & & & \\ \cline{1-1}  & methacrylate & & & & & \\ \hline \multirow{3}{*}{Resin 4} & 20\% DVB * & \multirow{3}{*}{0.60} & \multirow{3}{*}{5.7} & \multirow{3}{*}{422} & \multirow{3}{*}{113} & \multirow{3}{*}{8.8} \\  & 75.0\% Allyl & & & & & \\ \cline{1-1}  & methacrylate & & & & & \\ \hline \multirow{3}{*}{Resin 5} & 15\% DVB * & \multirow{3}{*}{0.36} & \multirow{3}{*}{5.8} & \multirow{3}{*}{249} & \multirow{3}{*}{80} & \multirow{3}{*}{8.8} \\  & 81.25\% Allyl & & & & & \\ \cline{1-1}  & methacrylate & & & & & \\ \hline \multirow{3}{*}{Resin 6} & 5\% DVB * & \multirow{3}{*}{0.002} & \multirow{3}{*}{6.2} & \multirow{3}{*}{1.18} & \multirow{3}{*}{0} & \multirow{3}{*}{-} \\  & 93.75\% Allyl & & & & & \\ \cline{1-1}  & methacrylate & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Characteristics of pore structure of AllMeth/DVB resins. Figure 4: Pore area is the pore size function for AllMeth/DVB copolymers. copolymer of methyl methacrylate and allyl methacrylate was used (through allyl groups) to anchor to the material of shell polymer. In such a case, it should be possible to observe changes to the specific surface area and micropores median pore width when samples were treated and dried from various solvents of different solubility parameters. Such results are presented in Table 2. Three polymers were chosen: with the highest content of DVB and with 20 and 15% of DVB--those which display the lowering specific surface area in Figure 3. As can be seen, resin 1, which has the highest proportion of DVB, shows excellent stability in the specific surface area. It is caused by the lowest swelling in toluene--solvent is not causing any increased mobility of chains between points of crosslinking and after a/drying from toluene; b/replacing toluene with acetone and drying from it; c/replacing acetone with methanol and drying from it and finally d/replacing methanol with water and drying from it the specific surface area is in the range of 472-483 m\({}^{2}\)/g. So, replacing good solvents with solvents of increasingly higher solubility parameters does not cause a contraction of the polymeric network, which is supported by the high amount of rigid vinyl crosslinks. In the case of resin 4, small changes can be seen, and the changes are very significant in resin 5. So, toluene has the ability to swell this resin, and when dried from that solvent, it contracts. Gradual replacement of toluene with more polar solvents causes stabilization of porous structure--flexible and much more polar poly(allyl methacrylate) fragments remain stretched upon drying, and resin 5 displays a much higher specific surface when dried from water and much lower when dried from toluene. In order to demonstrate the relative changes in specific surface area, the following calculations were made:  
The results are placed in Figure 5.