414862 Smart Gating Membranes with K+-Responsive Pore Size and Surface Property

Sunday, November 8, 2015
Exhibit Hall 1 (Salt Palace Convention Center)
Zhuang Liu1, Xiao-Jie Ju1,2, Rui Xie1, Wei Wang1 and Liang-Yin Chu1,2, (1)School of Chemical Engineering, Sichuan University, Chengdu, China, (2)State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, China

A novel smart gating membrane with K+-responsive pore size and surface property is prepared by grafting poly(N-isopropylacrylamide-co-acryloylamidobenzo-15-crown-5) (poly(NIPAM-co-AAB15C5)) copolymer chains in the pores of porous nylon-6 membranes with a two-step method combining plasma-induced pore-filling grafting polymerization and chemical modification. Due to the cooperative interaction of host-guest complexation and phase transition of the poly(NIPAM-co-AAB15C5) copolymer, not only the membrane pores with grafted gates could spontaneously switch from “closed” state to “open” state, but also the membrane surface is induced the hydrophilic/hydrophobic change of the membrane surface by recognizing K+ ions in the environment and vice versa; while other ions (e.g., Na+, Ca2+ or Mg2+) can not trigger such an ion-responsive switching function. The positively K+-responsive gating action of the membrane is rapid, reversible, and reproducible. The proposed K+-responsive gating membrane provide a new mode of behavior for ion-recognizable “smart” or “intelligent” membrane actuators, which is highly attractive for controlled release, chemical/biomedical separations, sensors, etc.

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