New composite ion‐exchange resins made from neutral precursors

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Abstract
The preparation of composite ion‐exchange or “no‐matrix” resins by polymerizing a mixture of basic and acidic monomers is a practical proposition only if some means can be found to minimize interaction between the monomers, so that the sites in the final polymer are not rendered inactive by internal salt formation. This paper reports one method of avoiding the strong interaction between the oppositely charged monomers by employing one or both of the monomers as an electrically neutral precursor. After carrying out the polymerization, the groups may be converted to a usable form by hydrolysis. The effect of solvent, the acid to base ratio, the degree of crosslinking, and the effect of the nature of the initiator on the preparation and properties of no‐matrix resins prepared using neutral acid precursors was studied; it was found that no‐matrix resins may be obtained with thermally regenerable capacities comparable to “plum pudding” resins.

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