A series of mono- and bifunctional telechelic poly(THF)s having various cyclic onium salt groups, i.e., tetrahydrothiophenium (1a and 2a), 1-methylpyrrolidinium (1b and 2b), and quinuclidinium (1c and 2c), were prepared and subjected to an ion-coupling reaction with poly(styrene-co-sodium acrylate) (3) having different carboxylate contents. The coupling reaction was found to take place efficiently by the simple precipitation of a THF solution of the mixture of 1 (or 2) and 3 into cooled water to produce graft (from 1 and 3) and network (from 2 and 3) copolymers, respectively, through the ion-exchange reaction between the prepolymers and the subsequent ring-opening reaction by the nucleophilic attack of the carboxylate anion toward the cyclic onium salt group either at an ambient condition (1a and 2a) or at an elevated temperature (1b, 2b, 1c, and 2c).
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Tezuka et al. (1993) studied this question.