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Enhancement of Salt Rejection and Water Flux by Crosslinking-Induced Microstructure Change of N-substituted Polybenzimidazole Membranes

Published online by Cambridge University Press:  16 September 2015

Motohiro Aiba ,
Takahiro Tokuyama ,
Hidetoshi Matsumoto ,
Hiroki Tomioka ,
Tomoya Higashihara  and
Mitsuru Ueda
Motohiro Aiba
Affiliation:
Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
Takahiro Tokuyama
Affiliation:
Toray Industries Inc., Sonoyama, Otsu, Shiga 520-0842, Japan.
Hidetoshi Matsumoto
Affiliation:
Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
Hiroki Tomioka
Affiliation:
Toray Industries Inc., Sonoyama, Otsu, Shiga 520-0842, Japan.
Tomoya Higashihara
Affiliation:
Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa City, Yamagata 992-8510, Japan.
Mitsuru Ueda
Affiliation:
Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa City, Yamagata 992-8510, Japan.
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Abstract

Crosslinked or non-crosslinked ultrathin semipermeable membranes based on the N-butylated and N-butylsulfonated polybenzimidazole (BPBI and BSPBI) were successfully prepared by spin-coating method. Structural characterization by FTIR and WAXD revealed that the N-substitution and the crosslinked structure of PBI suppressed the hydrogen bonding and increased the d-spacing. Furthermore, positron annihilation lifetime spectroscopy (PALS) clearly showed the pore radius change from 0.27-0.29 nm to 0.33 nm by crosslinking. As a result, the enhancement of water flux and NaCl rejection was achieved by the crosslinking of the BPBI and BSPBI. Especially, the crosslinked N-butylsulfonated PBI (CL-BSPBI) membrane significantly improved not only salt rejection but also water flux (NaCl rejection : 46 %, water flux : 22.1 L m-2 h-1) compared to those of non-crosslinked BSPBI one (NaCl rejection : 11 %, water flux : 1.88 L m-2 h-1) due to both the Donnan effect and the formation of larger pores in the membrane, respectively.

Keywords

x-ray diffraction (XRD)polymerthin film
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1745: Symposium FF – Materials as Tools for Sustainability , 2015 , mrsf14-1745-ff12-05.r1
Copyright
Copyright © Materials Research Society 2015 

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References

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