Pervaporation of water–ethanol mixtures through plasma graft polymerization of polar monomer onto crosslinked polyurethane membrane

✍ Scribed by Kueir-Rarn Lee; Shan-Jen Yu; Shih-Liang Huang; Da-Ming Wang; J. Y. Lai

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 298 KB
• Volume: 67
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19980307)67:10<1789::aid-app12>3.0.co;2-s

✦ Synopsis

To improve the pervaporation performance, the plasma post-graft polymerization of 2,3-epoxypropylmethacrylate (EPMA) onto the crosslinking polyurethane (CPU) membrane, EPMA-g-CPU, was synthesized in this study. The crosslinking between soft-soft hydroxyl-terminated polybutadiene (HTPB) segments were prepared by the introduction of benzoyl peroxide to the HTPB-based PU membrane. The effect of plasma treatment time and plasma supply power on the grafting yield was discussed. The optimum plasma treatment conditions were 10 W supply power and 120 s treatment time. The surface properties of the EPMA-g-CPU membrane were characterized by Fourier transform infrared spectroscopy, electron spectroscopy for chemical analysis, and a contact angle meter. A separation factor of 97 and a 240 g m 02 h 01 permeation rate through the EPMA-g-CPU membrane with a 4.81 mg/cm 2 grafting yield for a 90 wt % feed ethanol concentration were obtained. Compared with ungrafted CPU membrane, the EPMA-g-CPU membrane effectively improved the pervaporation performances.