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在缚酸剂Na2CO3存在下,使溶胀的氯甲基化交联聚苯乙烯(CMCPS)微球表面的氯甲基与对羟基苯甲醛(HBA)发生亲核取代反应,制得了醛基(AL)化改性的交联聚苯乙烯(ALCPS)微球;利用所制得的ALCPS微球与甘氨酸(GL)发生缩合反应,制备了同时含有席夫碱配基与羧基的席夫碱型螯合树脂AGCPS微球。采用红外光谱法表征了微球功能基团的结构变化,重点研究了CMCPS微球醛基化改性反应,考察了影响亲核取代反应的主要因素,推测和探讨了反应的机理。研究表明,CMCPS微球表面的苄氯基团与HBA缩合反应的速率与HBA的浓度无关,属于典型的SN1反应;使用极性较强的溶剂DMF,在较高的反应温度(90℃)下,有利于亲核取代反应的进行。所得席夫碱型螯合树脂对铜离子具有较强的螯合吸附能力。
In the presence of acid-binding agent Na2CO3, the chloromethyl group on the surface of the swollen chloromethylated crosslinked polystyrene (CMCPS) microspheres was nucleophilic substitution with p-hydroxybenzaldehyde (HBA) ) Modified crosslinked polystyrene (ALCPS) microspheres; using the prepared ALCPS microspheres with glycine (GL) condensation reaction, prepared simultaneously containing Schiff base ligand and carboxyl Schiff base chelate Resin AGCPS microspheres. The structural changes of the functional groups of the microspheres were characterized by infrared spectroscopy. The modification reaction of the CMCPS microspheres was mainly studied. The main factors influencing the nucleophilic substitution reaction were investigated. The reaction mechanism was presumed and discussed. The results showed that the rate of condensation reaction of benzyl chloride group with HBA on the surface of CMCPS microspheres was independent of the concentration of HBA, and was a typical SN1 reaction. The solvent of DMF with higher polarity was used at higher reaction temperature (90 ℃) , Is conducive to the nucleophilic substitution reaction. The resulting Schiff base chelating resin has strong chelating adsorption ability to copper ion.