Macroporous, monodisperse PS/DVB particles with diameters of 4.0-4.6 μm were functionalized via free radical graft polymerization to create high performance anion exchangers. Varying the amount of monomer from 0 to 10 mmol per 2.0 g PS/DVB allows a control of the column capacity to create columns with capacities up to 350 μeq/column for 100 mm columns. No further increase of the capacity is observed when using more than 6 mmol of the monomer due to a rivaling homopolymerization. With increasing capacity, the exchangers showed increasing selectivity factors of Br- and NO3- in reference to Cl- from 2.4 to 4.3 and 3.5 to 4.6, changing the elution order in the process. At the same time, contradicting the retention model, the selectivity of SO42- did not change with increasing capacity. Analyzing the amount of converted double bonds during functionalization allowed to identify a grafting-onto mechanism, as the amount of converted double bonds ranges from 0% to 52% depending on the amount of monomer used. This information also allowed the calculation of the average chain length, which ranges from 1 to 6 exchanger groups. The average chain length depends on the amount of monomer used, creating higher average chain lengths with higher amounts of monomer. However, it was not possible to link the observed selectivity differences to the average chain lengths of the columns or the influence of the column capacity on the ion exchange mechanism.

中文翻译：

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接枝高性能阴离子交换剂的选择性及其潜在接枝机制的研究

直径为 4.0-4.6 μm 的大孔单分散 PS/DVB 颗粒通过自由基接枝聚合进行功能化，以产生高性能的阴离子交换剂。将单体量从 0 到 10 mmol/2.0 g PS/DVB 变化，可以控制色谱柱容量，为 100 mm 色谱柱创建容量高达 350 μeq/色谱柱的色谱柱。当使用超过 6 mmol 的单体时，由于竞争性均聚，没有观察到容量的进一步增加。随着容量的增加，交换器显示出 Br- 和 NO3- 相对于 Cl- 的选择性因子从 2.4 增加到 4.3，从 3.5 增加到 4.6，从而改变了过程中的洗脱顺序。同时，与保留模型相矛盾的是，SO42- 的选择性没有随着容量的增加而改变。分析官能化过程中转化的双键的数量可以确定接枝机制，因为转化的双键的数量范围从 0% 到 52%，具体取决于所用单体的数量。该信息还允许计算平均链长，其范围为 1 到 6 个交换器组。平均链长取决于所用单体的量，单体量越高，平均链长越高。然而，无法将观察到的选择性差异与色谱柱的平均链长或色谱柱容量对离子交换机制的影响联系起来。该信息还允许计算平均链长，其范围为 1 到 6 个交换器组。平均链长取决于所用单体的量，单体量越高，平均链长越高。然而，无法将观察到的选择性差异与色谱柱的平均链长或色谱柱容量对离子交换机制的影响联系起来。该信息还允许计算平均链长，其范围为 1 到 6 个交换器组。平均链长取决于所用单体的量，单体量越高，平均链长越高。然而，无法将观察到的选择性差异与色谱柱的平均链长或色谱柱容量对离子交换机制的影响联系起来。