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首页> 外文期刊>Journal of Applied Polymer Science >Stability constants of polymer-bound iminodiacetate-type chelating agents with some transition-metal ions
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Stability constants of polymer-bound iminodiacetate-type chelating agents with some transition-metal ions

机译：聚合物结合的亚氨基二乙酸酯型螯合剂与某些过渡金属离子的稳定性常数

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摘要

A chelating vinyl monomer, glycidyl methacrylate (GMA)-iminodiacetic acid (IDA), was formed by the reaction between GMA and IDA. Three polymeric chelating agents, PGMA-IDA, PGMA-IDA-co-methyl acrylate (MA), and PGMA-IDA-co-acrylamide (AAm), were also synthesized. Acid dissociation constants and stability constants of these chelating agents with Ni(II), Zn(II), and Co(II) were determined by means of potentiometric titration and ultraviolet-visible spectrophotometry, respectively. The values of K-a1 and K-a2 of all the polymeric chelating agents were smaller than those of GMA-IDA. The stability constants of all the polymeric chelating agents were larger than those of GMA-IDA. Increasing the MA content within PGMA-IDA-co-MA affected the stability constant only slightly. A proper molar ratio of AAm in PGMA-IDA-co-AAm, stability constants was 30-60 times greater than that of GMA-IDA. However, as the molar content of AAm increased, the stability constant of PGMA-IDA-co-AAm decreased. The results obtained in the polymer system are explained in terms of the polymer's stereo and entanglement structure, the neighboring effect, and the hydrophobic/hydrophilic nature of MA or AAm. (C) 2002 Wiley Periodicals, Inc. [References: 36]
机译：螯合的乙烯基单体，甲基丙烯酸缩水甘油酯（GMA）-亚氨基二乙酸（IDA），是通过GMA和IDA之间的反应形成的。还合成了三种聚合螯合剂：PGMA-IDA，PGMA-IDA-丙烯酸甲酯（MA）和PGMA-IDA-丙烯酰胺（AAm）。分别通过电位滴定法和紫外可见分光光度法测定这些螯合剂与Ni（II），Zn（II）和Co（II）的酸解离常数和稳定性常数。所有聚合物螯合剂的K-a1和K-a2值均小于GMA-IDA。所有聚合物螯合剂的稳定性常数均大于GMA-IDA。 PGMA-IDA-co-MA中MA含量的增加对稳定性常数的影响很小。 PGMA-IDA-co-AAm中AAm的适当摩尔比（稳定常数）是GMA-IDA的30-60倍。然而，随着AAm的摩尔含量的增加，PGMA-IDA-co-AAm的稳定性常数降低。从聚合物的立体和缠结结构，邻近效应以及MA或Aam的疏水性/亲水性方面解释了在聚合物系统中获得的结果。 （C）2002 Wiley Periodicals，Inc. [参考：36]

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