Association of hard segments in gas separation through polyurethane membranes with aromatic bulky chain extenders

Afsaneh Fakhar, Morteza Sadeghi*, Mohammad Dinari, Rob Lammertink (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)


A series of poly(urethane-urea) (PUU) membranes based on contributing hard segments in gas separation were prepared using two novel bulky chain extenders, polytetramethylene-glycol, isophorone and hexamethylene-diisocyanate. The chain extenders were synthesized by cyanuric chloride, aniline/naphthylamine and hydrazine. According to FTIR, AFM and DSC, bulkier PUU membranes showed more phase separation and lower glass transition temperature consistent with higher fractional free volume, which were correlated with single (CO2, CH4, O2 and N2) and mixed (CO2:N2 and CO2:CH4) gas permeation results. The main findings indicate these polyurethanes serve efficiently designed molecular structures favoring bulky hard segments contribution in gas separation. The bulky PUU membranes afford simultaneous increased permeability and selectivity, while maintaining high tensile properties. Enhanced O2/N2 diffusivity selectivity by bulkier PUU and CO2 sorption/desorption study by Ellipsometry confirmed hard segments’ association, too. The bulkiest membrane provided 126% and 54% improvement for single CO2 permeability and CO2/N2 selectivity compared to linear one.

Original languageEnglish
Pages (from-to)136-146
Number of pages11
JournalJournal of membrane science
Publication statusPublished - 15 Mar 2019


  • UT-Hybrid-D
  • Gas separation
  • Hard segment association
  • Phase separation
  • Polyurethane membranes
  • Bulky diamine chain extenders

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