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A series of water-insoluble cyclodextrin polymers (CDP) was prepared by crosslinking β-cyclodextrin (CD) with polyethylene glycol diglycidyl ether (PEGDE). Similarly, a reference CDP was prepared using ethylene glycol diglycidyl ether (EGDE). Increasing the feed ratio of PEGDE to CD in the reaction mixture led to high degrees of crosslinking. Relaxation measurements revealed structural homogeneity among the CDPs, which exhibited mobilities that strongly depended on the chain lengths of the crosslinking agents. In addition, all the CDPs displayed high encapsulation abilities toward bisphenol A (BPA) in aqueous media. In particular, the CDP sample with a low degree of crosslinking by PEGDE showed the highest encapsulation ability toward BPA. In contrast, the CDP crosslinked by EGDE exhibited low encapsulation ability because its highly dense structure, which results from the short chain lengths of the crosslinking agents, hinders the penetration of BPA molecules.

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The cyclopolymerizations of (2S,5S)-1,2:5,6-diepoxyhexane using BF3·OEt2 and tert-BuOK have been studied. The polymer yield and molecular weight of the polymer using tert-BuOK were higher than those using BF3·OEt2. For the polymers using BF3·OEt2, the mole fractions of the cyclized units were 0.76−0.90, and the cyclic constitutional repeating units were five- and six-membered rings. The polymer using tert-BuOK essentially consisted of the five-membered cyclic repeating unit.

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