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    標題: Physicochemical effects of hydrolyzed asymmetric polyacrylonitrile membrane microstructure on dehydrating butanol
    作者: Lai, Cheng-Lee
    Chao, Wei-Chi
    Hung, Wei-Song
    An, Quanfu
    De Guzman, Manuel
    Hu, Chien-Chieh
    Lee, Kueir-Rarn
    貢獻者: 環境工程與科學系
    關鍵字: Polyacrylonarile
    Free volume
    Positron annihilation lifetime
    日期: 2015-09
    上傳時間: 2016-04-19 19:07:02 (UTC+8)
    出版者: Elsevier Science Bv
    摘要: Traditionally, polyacrylonitrile (PAN) is coated with a selective layer to tailor it for dehydrating butanel by pervaporation. But we hydrolyzed PAN with sodium hydroxide for such a purpose. Fourier transform infrared and X-ray photoelectron spectroscopy indicated that PAN's CN group was hydrolyzed to CONH2, which was further converted to COOH. As a result, the hydrolyzed PAN (HPAN) was made more hydrophilic, as evidenced from water contact angle data. CONH2 and COOH formed hydrogen bonds between them, causing molecular chains to rearrange (according to X-ray diffraction) and pores to shrink (shown by scanning electron microscopy). Positron annihilation lifetime spectroscopy revealed that hydrolysis led to free volume radius decrease; however, prolonged hydrolysis caused breakage of molecular chains. The HPAN produced after 4 h hydrolysis exhibited narrow free volume distribution and delivered exceptional performance (water concentration in permeate = 99.1 wt%; permeation flux = 2.03 kg/m(2)h). (C) 2015 Elsevier B.V. All rights reserved.
    顯示於類別:[環境工程與科學系(所)] 期刊論文


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