In the ion-exchange method, the resins are cross-linked water-insoluble polymers that contain ionisable functional groups that form a repeating pattern of polymers, creating a polymer chain.
2.
The response is triggered due to the presence of ionisable functional groups ( like-COOH,-NH 2 ) which get ionized and acquire a charge ( + /-) in a certain pH . The polymer chains now have many similarly charged groups which causes repulsion and hence the material expands in dimensions.
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