Pristine and thermally-rearranged gas separation membranes from novel o-hydroxyl-functionalized spirobifluorene-based polyimides

Xiaohua Ma, Octavio Salinas, Eric Litwiller, Ingo Pinnau

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

A novel o-hydroxyl-functionalized spirobifluorene-based diamine monomer, 2,2′-dihydroxyl-9,9′-spiro-bifluorene- 3,3′-diamine (HSBF), was successfully prepared by a universal synthetic method. Two o-hydroxyl-containing polyimides, denoted as 6FDA-HSBF and SPDA-HSBF, were synthesized and characterized. The BET surface areas of 6FDA-HSBF and SPDA-HSBF are 70 and 464 m2 g-1, respectively. To date, SPDA-HSBF exhibits the highest CO2 permeability (568 Barrer) among all hydroxyl-containing polyimides. The HSBF-based polyimides exhibited higher CO2/CH4 selectivity than their spirobifluorene (SBF) analogues (42 for 6FDA-HSBF vs. 27 for 6FDA-SBF) due to an increase in their diffusivity selectivity. Polybenzoxazole (PBO) membranes obtained from HSBF-based polyimide precursors by thermal rearrangement showed enhanced permeability but at the cost of significantly decreased selectivity.
Original languageEnglish (US)
Pages (from-to)6914-6922
Number of pages9
JournalPolym. Chem.
Volume5
Issue number24
DOIs
StatePublished - Sep 22 2014

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry
  • Biomedical Engineering
  • Bioengineering
  • Polymers and Plastics

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