The cyclotetrapolymerization of four diallylamine salt monomers, containing chelating motifs of aminocarboxylate, aminophosphonate, aminosulfonate and primary amine at the terminal of an alkyl chain (CH₂)₁₂, has led to the synthesis of a tetrapolymer in excellent yield. A copolymer of methacrylate having acetyl acetate pendant has also been synthesized. The two polymers in aqueous solution is found to form gel because of covalent crosslinking via formation of imine bond by condensation of –NH₂ groups of the tetrapolymer with the acetoacetate groups of the polymethacrylate copolymer. This is the first example of a cyclopolymer immobilized by covalent crosslinking with a polymethacrylate. The hydrogel, embedded with chelating motifs of aminoalkyl-carboxylate, phosphonate and sulfonate as well as imine motifs, demonstrated remarkable efficacies for the removal of Hg(II) ions at ppb levels. A 50 mg-dose of the hydrogel immersed in aqueous medium (20 mL) could reduce the concentration of Hg(II) from 200 and 500 ppb to 0.20 and 0.17 ppb, respectively, within 30 min. The hydrogel has also been shown to be remarkably effective in the removal of several toxic and priority metal pollutants from the matrix of an industrial wastewater.

在烷基链（CH ₂）₁₂的末端包含氨基羧酸盐，氨基膦酸盐，氨基磺酸盐和伯胺的螯合基序的四种二烯丙基胺盐单体的环四聚合反应导致以优异的产率合成四聚物。还合成了具有乙酰乙酸酯侧基的甲基丙烯酸酯的共聚物。发现水溶液中的这两种聚合物形成凝胶，是因为通过-NH ₂的缩合形成亚胺键进行共价交联四元共聚物的基团和聚甲基丙烯酸酯共聚物的乙酰乙酸酯基团。这是通过与聚甲基丙烯酸酯共价交联而固定化的环聚合物的第一个例子。嵌入了氨基烷基羧酸盐，膦酸酯和磺酸盐的螯合基序以及亚胺基序的水凝胶在ppb浓度下具有显着的去除Hg（II）离子的功效。将50 mg剂量的水凝胶浸入水性介质（20 mL）中，可以在30分钟内将Hg（II）的浓度分别从200 ppb和500 ppb降低至0.20和0.17 ppb。还显示出水凝胶在从工业废水的基质中去除几种有毒的优先金属污染物方面非常有效。