Mechanically Strong and Flexible Hydrolyzed Polymers of Intrinsic Microporosity (PIM-1) Membranes

Wai Fen Yong, Tai Shung Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


A systematic strategy to molecularly design flexible tough hydrolyzed polymers of intrinsic microporosity (hPIM-1) films from the PIM-1 polymer is explored in this study. Flexible films can be fabricated from N-methyl-2-pyrrolidone (NMP) by appropriate hydrolysis conditions. The optimal weight ratio of NaOH/H2O/EtOH in the base-catalyzed reaction is 0.5/2/2. Because of the highly polar carboxylic acid groups, the resultant hPIM-1 has a lower water contact angle. The hPIM-1 has one-half fractional free volume compared to PIM-1 which is in good agreement with permeability. Moreover, hPIM-1 follows as the same dual-mode sorption model as PIM-1. To the best of our knowledge, this is the first ever reported flexible hPIM-1 film in the literature.

Original languageEnglish (US)
Pages (from-to)344-354
Number of pages11
JournalJournal of Polymer Science, Part B: Polymer Physics
Issue number4
StatePublished - Feb 15 2017
Externally publishedYes


  • diffusion
  • dual-mode model
  • gas permeability
  • gas solubility
  • mechanical properties
  • polymers of intrinsic microporosity
  • positron annihilation lifetime spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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