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Monolithic poly(octadecyl methacrylate-co-ethylene dimethacrylate) capillary columns for use in capillary electrochromatography (CEC) were developed and characterized by porosimetric measurements and scanning electron microscopy (SEM). The stationary phases were prepared using 2-acryloylamido-2-methylpropanesulfonic acid (AMPS) as the ionizable monomer and 2,2’-azobisisobutyronitrile (AIBN) as the initiator of thermal polymerization, which occurred at 60°C. The porogenic solvents used in this work were amyl alcohol and 1,4-butanediol, in the proportion 65:35 (v/v). The ratio between monomers and porogenic solvents was varied in a range of 60 to 80% (v/v) of porogenic agents. The porosimetry showed that the increase in content of porogenic solvents caused an increase in pore surface area, but a relationship with the separation efficiencies was not observed. SEM agreed with the conclusions made through porosimetry, where decreases in globule size could be noted with increases in porogenic solvents.
| Authors: | Valeska Soares Aguiar, Carla Beatriz Grespan Bottoli | |
| Journal: | Microchemical Journal | |
| Year: | 2012 | |
| DOI: | 10.1016/j.microc.2012.04.006 | |
| Publication date: | 23-04-2012 |
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