Abstract
Macroporous polymer monoliths based on poly(styrene-co-divinylbenzene) with varied styrene/divinylbenzene ratios have been prepared by organotellurium-mediated living radical polymerization. The well-defined co-continuous macroporous structure can be obtained by polymerization-induced spinodal decomposition, and the pore structures are controlled by adjusting the starting composition. The effects of the addition of styrene on the pore characteristics have been investigated. In addition, the separation efficiency of small molecules (alkylbenzenes) in the obtained monoliths has been evaluated in the capillary format by high-performance liquid chromatography (HPLC) under the isocratic reversed-phase mode. Baseline separations of these molecules with a low pressure drop (~2 MPa) have been achieved owing to the well-defined macropores and to the less-heterogeneous crosslinked networks. It was also revealed that the increase in styrene/divinylbenzene ratio decreased the retention of alkylbenezenes on the polymer monolithic column due to the less crosslink density.
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