Side-chain engineering of ladder-structured polysilsesquioxane membranes for gas separations

Sunghwan Park, Albert S. Lee, Yu Seong Do, Jeong F. Kim, Seung Sang Hwang, Young Moo Lee, Jung-hyun Lee, Jong Suk Lee

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A comprehensive and fundamental gas transport study of ladder-structured polysilsesquioxanes (LPSQs) was systematically performed by investigating the effects of various alkyl substituents, different copolymer ratios, and UV-irradiation induced photo-crosslinking on gas separations. Overall, LPSQ membranes are more suitable for CO2/N2 and CO2/H2 separations due to a relatively high affinity towards CO2 as well as rubbery polymer properties. The gas transport in LPSQ membranes was well interpreted by two important parameters, the inter-chain distance and the side chain mobility. A combination of larger inter-chain distance and higher side chain rigidity tends to increase the fractional free volume, resulting in higher gas permeability. Also, it was successfully demonstrated that the separation performance of LPSQ membranes can be predicted by using a logarithmic permeability relationship based on the transport characterization for a series of ladder-structured poly(phenyl-co-methacryloxypropyl)silsesquioxanes. Lastly, the UV-curing process reduced the permeability of LPSQ membranes, increasing the selectivity due to the restricted chain mobility.

Original languageEnglish
Pages (from-to)202-214
Number of pages13
JournalJournal of Membrane Science
Volume516
DOIs
Publication statusPublished - 2016 Oct 15

Keywords

  • Gas separations
  • Ladder-structured polysilsesquioxanes
  • Membranes
  • Substituent effects

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Science(all)
  • Biochemistry
  • Filtration and Separation

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