Micro-extraction monolithic column of ionic liquid polymer capillary tube and preparation method thereof
An ionic liquid and capillary technology, which is applied in the fields of polymer materials and analytical chemistry, can solve the problems such as the monolithic ionic liquid column, which affects the stability and extraction performance of the column, and achieves easy regulation of reaction conditions, uniform internal structure and pore size distribution. , the effect of long service life
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Embodiment 1
[0018] Mix 0.05 g lauryl methacrylate and 0.05 g 1-allyl-3-octylimidazolium hexafluorophosphate binary monomer, 0.15 g ethylene glycol dimethacrylate crosslinker, 0.003 g Azobisisobutyronitrile initiator and mixed porogen (n-propanol 0.3 g, butanediol 0.3 g) were mixed at room temperature and ultrasonically oscillated for 20 min to obtain a reactant solution, which was injected into a vinyl-treated capillary. Both ends were sealed, immersed in a water bath at 60°C to initiate the polymerization reaction for 15 h; after the reaction was completed, the column was washed with methanol to remove unreacted monomers, cross-linking agents and porogens in the capillary, and 1-ene was obtained after drying Propyl-3-octylimidazole ionic liquid-dodecyl methacrylate-ethylene glycol dimethacrylate polymer monolithic column for capillary microextraction.
[0019] figure 1 A and B show the global and local images of the SEM images of the monolithic column. The figure shows that after dopi...
Embodiment 2
[0024] 0.05 g dodecyl methacrylate monomer, 0.15 g ethylene glycol dimethacrylate crosslinking agent, 0.003 g azobisisobutyronitrile initiator and mixed porogen (n-propanol 0.3 g, Butanediol 0.3 g), mixed at room temperature and ultrasonically oscillated for 20 min to obtain a reactant solution, injected into a vinyl-treated capillary, sealed at both ends, immersed in a 60°C water bath to initiate polymerization for 15 h; after the reaction was completed, Rinse the column with methanol to remove unreacted monomers, cross-linking agents and porogens in the capillary, and dry to obtain dodecyl methacrylate-ethylene glycol dimethacrylate polymer capillary solid-phase microextraction monolithic column.
[0025] figure 1 C and D show the global and local images of the SEM images of the monolithic microextraction column. It can be seen from the figure that, compared with the ionic liquid polymer microextraction monolithic column in Example 1, the ionic liquid-free polymer microex...
Embodiment 3
[0027]0.05 g lauryl methacrylate and 0.05 g 1-allyl-3-hexylimidazolium hexafluorophosphate binary monomer, 0.2 g ethylene glycol dimethacrylate crosslinker, 0.003 g AZBN initiator and mixed porogen (n-propanol 0.3 g, butanediol 0.3 g) were mixed at room temperature and ultrasonically oscillated for 20 min to obtain a reactant solution, which was injected into a vinyl-treated capillary tube. The end was sealed, and immersed in a 70°C water bath to initiate a polymerization reaction for 16 h; after the reaction was completed, the column was washed with methanol to remove unreacted monomers, cross-linking agents and porogens in the capillary, and dried to obtain 1-allyl - 3-hexylimidazole ionic liquid - dodecyl methacrylate - ethylene glycol dimethacrylate polymer monolithic column for capillary microextraction.
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