关键词: 点击化学, 浇铸, 膜, 扩散, 透析

Abstract: Homogeneous anion-exchange membrane featured with excellent efficacy of diffusion dialysis (DD)is prepared through casting process for modeling membrane method. The matrix is the segmented copolymer formed from polystyrene-butadiene-styrene and propargyl trimethylamine is adopted as the alkaline functional group. The synthesis of polymer SBS-TMA is achieved by click chemistry process. The chemical structure and morphology of the polymer are characterized by ¹H NMR spectroscopy (¹H NMR)and scanning electron microscopy (SEM). With the help of thermal gravimetric (TG)analyzer and precision balance, thermal and acidic stability of the membrane are studied. We have explored the impacts of the content of functional groups and temperature on its DD property. The results show that, when the content of functional group is 0.20 (SBS-TMA-0.20), the diffusion coefficient (U_H⁺)for the membrane is 2.86×10^-2m/h, and the separation coefficient (S)is 28.1. The DD property of this membrane is twice to three times as good as that of the commercial membrane DF-120. When the system temperature rises from 25℃ to 70℃, the U_H⁺ of SBS-TMA-0.20 increases from 2.86×10^-2m/h to 4.48×10^-2m/h accordingly, and its S increases from 28.1 to 30.1, but then sharply reduces to 16.2.

Key words: click chemistry, casting, membrane, diffusion, dialysis