Topic【重合法の開発】「旋回」重合によるゲル・ビーズの製造 Production of gel beads by “circulation” polymerization


【文責:学部生MI】感熱ポリ(N−イソプロピルアミド)ハイドロゲル(NIPAハイドロゲル)ビーズは反応や分離プロセスの応用があり、注目を集めている。当学科ではミリメートルサイズである単分散NIPAハイドロゲルビーズの調合に焦点を当て、「旋回」重合技術を提案しました(React. Funct. Polym.誌)。
More/in English…

Thermosensitive poly(N-isopropylacrylamide) hydrogel (NIPA hydrogel) beads have attracted much attention due to their applications in reaction and separation processes. A group of our department focuses on the preparation of millimeter-sized, monodispersed NIPA hydrogel beads, for which a novel circulation polymerization technique is proposed.(React. Funct. Polym.) The method involves the drop-wise addition of a pre-gel aqueous solution into swirling silicone oil through a nozzle, and the subsequent conventional free-radical polymerization of the suspended pre-gel droplets, which drifts with the swirling oil. The circulation polymerization technique improves the residence time and can be applied to a polymerization system that requires a long gelation time. The size of the resultant hydrogel beads corresponds to the size of the pre-gel droplets that are delivered from the tip of the nozzle, and can be controlled by adjusting the size of the nozzle. Microspheres and millimeter-sized gel beads are suitable for column operations, such as packed bed, moving bed, and fluidized bed operations that are used.


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