1 Supplementary Information Preparation of high-performance hydroxide exchange membrane by a novel ablation restriction plasma polymerization approach Chengxu Zhang, ab Jue Hu, a Yuedong Meng, a Masaaki Nagatsu c and Hirotaka Toyoda d a Institute of Plasma Physics, Chinese Academy of Sciences, P. O. Box 1126, Hefei, P.R. China b Department of Modern Physics, University of Science and Technology of China, Hefei, P. R. China c Nanovision Science Section, Graduate School of Science and Technology, Shizuoka University, Naka-ku, Hamamatsu, Japan d hujue@ipp.ac.cn Department of Electrical Engineering and Computer Science, Nagoya University, Chikusa, Nagoya, Japan Experimental details Preparation of the plasma-polymerized vinylbenzyl chloride membranes The membranes were synthesized in an after-glow discharge plasma polymerization apparatus, consisting of two regions: the plasma discharge region (upper part) and the plasma polymerization region (lower part). Between them are a stainless steel screen grid (SG) applied a bias voltage of -30 V to hindered the electrons (generated in the plasma discharge region) from the polymerization region. VBC (95 wt%, Alfa Aesar ® ), Electronic Supplementary Material (ESI) for Chemical Communications This journal is © The Royal Society of Chemistry 2011