Reparation and Characterization of Molecularly Imprinted Polymers of Dimethyl Phthalate Based on DES-RAFT Reaction Technique
Based on the basic properties of eutectic solvent(DES)system,a novel molecular-imprinted polymer was prepared by reversible addition-fragmentation chain transfer(RAFT)precipitation polymerization,and its structure characterization and properties were evaluated.The results show that the prepared dimethyl phthalate molecularly imprinted polymer(DMP-MIPs)has good specific selectivity for the targets if it is prepared when tetrabutylammonium bromide lauric acid is selected as the eutectic solvent(DES)system,dimethyl phthalate(DMP)as the molecular template,α-methacrylic acid(MAA)as the functional monomer,ethylene glycol dimethacrylate(EGDMA)as the crosslinking agent,azodiisobutyronitrile(AIBN)as the chain initiator,dibenzyl trithiocarbonate(DBTTC)as chain transfer agent,and with a ratio of the template and the functional monomer to the crosslinker molar being 1∶4∶16 under the polymerization.At the same time,due to the unique hydrogen bonding of the eutectic solvent,not only the size and morphology of the polymer microspheres are improved,but also the adsorption capacity of the molecularly imprinted polymer for dimethyl phthalate is enhanced,and the imprinting factor IF can reach 1.122.DES-MIPs was applied to the actual water sample detection,and three concentrations(0.05,0.5,1.0 mg/L)were added to the experiment.The average recovery rate was between 86.8%-94.3%,and the relative standard deviation(RSD)was between 2.41%and 3.21%.Thus it can be seen that the molecularly imprinted polymeric material prepared based on DES-RAFT reaction technology has good selective adsorption of DMP in water quality,and is expected to be applied to the environmental field for detection of toxic and harmful substances.
eutectic solventreversible addition-fragmentation chain transfer polymerizationdimethyl phthalate molecularly imprinted polymer
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