Fig. 1. Pore size distributions of the polymeric adsorbents.
polymer. Typically, two types of porogens, good solvents and non- solvents, are frequently used in the preparation of porous polymer [24]. Polymers prepared in a good solvent, such as toluene, are usu- ally found to be more microporous. Investigation of the morphology and pore size distribution of poly(meta-DVB) and poly(para-DVB) prepared in the presence of toluene indicated that the resulting porous polymers were mainly composed of micropores [32]. In the presence of a good solvent the generation of micropores is gener- ally associated with the effective solvating of the growing polymer chains, which consequently delays the precipitation of the polymer. The retarded phase separation leads to an enhanced crosslinking between polymer chains and eventually to an increased microp- orosity.
The polymer with abundant micropores was also prepared via postcrosslinking of the chloromethylated polymer. The specific surface area of the commercial chloromethylated polymer was determined to be 35.8 m2 g−1 . After postcrosslinking process, the specific surface area increased up to 782.0 m2 g−1 . Jerabek et al. [28] studied postcrosslinking of chloromethylated copolymer and found that polymers with specific surface areas of 940 and 720 m2 g−1 could be obtained by postcrosslinking process using gel-type chloromethylated polymer and macroreticular chloromethylated