Hydrophilic hypercrosslinked pyridine-containing polymers

The fast and sufficiently complete reaction proceeds in dimethyl sulfoxide, dimethylformamide, hexamethylphosphotriamide, and excess 4-vinylpyridine, but the best results were achieved in N-methyl-N-butylimi-dazolium tetrafluoroborate, an ionic liquid. The final polymers demonstrate a noticeable volume increase by taking up as much organic solvents, both polar and nonpolar, and even water, as a hypercrosslinked polystyrene crosslinked with the same crosslinking agent (Table 9.4). Still, the specific surface area of the hydrophilic hypercrosslinked polymer is smaller than that of the hypercrosslinked polystyrene, being less than 100 m/g. In all probability, the rigidity of the hypercrosslinked vinylpyridine product is 

Sample Benzene n-Heptane Acetone Ethanol Water 

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