How are ion exchange resins classified based on their structure?

(1) Gel-type resins: Ion exchange resins produced by conventional polymerization methods are all composed of many irregular network-like polymers, resembling gels. Such resins have poor oxidation resistance and mechanical strength, and are prone to contamination by organic substances. (2) Macroporous resin: Macroporous resin is composed of small pieces of gelatinous resin, with pores existing between these pieces; as a result, such resin has numerous pores both inside and on its surface. It is capable of removing colloidal silica and large molecular compounds, and it also exhibits improved resistance to organic contamination. (3) Supergel-type resin: Supergel-type resins have good mechanical strength and can be compared to macroporous resins. (4) Homoporous strong-base anion resin: Homoporous strong-base anion resins can prevent poisoning by organic substances; their absorption of organic substances is reversible, so they do not get contaminated.

There are just two types: cations and anions.

The second floor is already very comprehensive. There are also cation-anion chelating resins, which have a different microstructure and should be considered a separate category.