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Ultrafast layer-by-layer assembly of PDMS for boosting the H2 separation of a P84 membrane
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  • Guozhen Li,
  • Zhihao Si,
  • Shuai Yang,
  • Tanlong Xue,
  • Jan Baeyens,
  • Peiyong Qin
Guozhen Li
Beijing University of Chemical Technology
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Zhihao Si
Beijing University of Chemical Technology
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Shuai Yang
Beijing University of Chemical Technology
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Tanlong Xue
Beijing University of Chemical Technology
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Jan Baeyens
Beijing University of Chemical Technology
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Peiyong Qin
Beijing University of Chemical Technology
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Abstract

BTDA-TDI/MDI (P84) has been widely applied in gas separation, however, pinholes or defects on P84 membrane surfaces were formed in the membrane preparation process and directly weaken its separation performance. Herein, we developed an ultrafast polydimethylsiloxane (PDMS) layer-by-layer assembly strategy via spraying method to heal the defects of the P84 membrane. Firstly, a very short assembly time 20-30 s was achieved by a UV-curing method. Secondly, both the PDMS spraying concentration and cycle times were optimized to strengthen the healing ability of PDMS. The P84-PDMS membrane with 3 wt % PDMS spraying concentration and 2 spraying cycle times significantly improve the H2/CH4 selectivity from 62.99 to 231.92 with a satisfactory H2 permeance (20.85 GPU). The layer-by-layer PDMS assembly strategy for healing defects of P84 membrane displays outstanding comprehensive abilities, with an easy manufacturing based upon ultrafast curing and excellent gas separation performance based on the defect-free membrane structure.