交换基团

每摩尔交换基团所对应的PFSA再生树脂的质量（EW）达到1130，接近Dupont公司产品Nafion117的相应性能参数。

Equivalent weight ( EW ) of the prepared PFSA resin attained 1 130 , which is close to that of Nafion 117 , the product of Dupont .

证明这种以磺酸基为交换基团的螯合形成树脂是稳定的，可重复使用。

It was proved that this chelate-forming resin with sulphonic acid group as ion exchanging group is stable , and it can be used repeatedly .

荷电镶嵌膜系由一系列规则排列的阴离子和阳离子交换基团所组成，每一基团为其反离子提供从原料液相到渗透液相的连续通道。

A charged mosaic membrane consists of a set of anion and cation exchange elements arranged in parallel , each element providing a continuous pathway from one bathing solution to the other .

综述了近年来氨基磺酸作为一种绿色催化剂在有机合成中的应用，主要包括酯化与酯交换、基团保护、氮杂Diels-Alder、重排、取代及缩合等反应。

It is reviewed that sulfamic acid can be utilized as a green catalyst in many important organic reactions such as esterification and transesterification , group protection , imino-Diels-Alder , rearrangement , substitution and condensation .

合成带有离子交换功能团的聚合物整体柱的方法通常有两种。其一是，直接共聚引入离子交换功能基团；其二是，对整体柱表面进行不同的后化学修饰。

Polymeric monoliths with ion-exchange functionality are usually obtained either by direct co-polymerization of the monomers containing ion-exchange functionality or through different post-modifications of monolith surface .