Pure gas and vapor permeation properties of poly[1-phenyl-2-[p-(trimethylsilyl)phenyl]acetylene] (PTMSDPA) and its desilylated analog, poly[diphenylacetylene] (PDPA)

Roy D. Raharjo, Hyuck J. Lee, Benny D. Freeman, Toshikazu Sakaguchi, Toshio Masuda

Research output: Contribution to journalArticleResearchpeer-review

26 Citations (Scopus)

Abstract

The permeabilities of He, H2, N2, O2, CO2, CH4, C2H6, C3H 8, and n-C4H10 in poly[1-phenyl-2-[p-(trimethylsilyl)phenyl]acetylene] (PTMSDPA) and poly[diphenylacetylene] (PDPA) are presented and compared to those of poly(1-trimethylsilyl-1-propyne) (PTMSP), poly(1-phenyl-1-propyne) (PPP), and polysulfone. Like PTMSP, PTMSDPA, a disubstituted glassy acetylene-based polymer, exhibits higher permeabilities to organic vapors than to permanent gases due to its rigid polyacetylene backbone and bulky side groups, which provide a relatively high fractional free volume (FFV) value of 0.26. Desilylation was performed on PTMSDPA. The resulting material, PDPA, is totally insoluble in common organic solvents, so it has much higher chemical resistance than PTMSDPA. Additionally, due to its insolubility in polymerization solvents, desilylation provides the only known route to high molar mass PDPA. The FFV of the resulting membrane (PDPA) is reduced by approximately 12% relative to that of PTMSDPA. This leads to a decrease in gas permeability values and selectivity of organic vapors relative to nitrogen. For example, the oxygen permeability is reduced from 1200 to 500 Barrers upon desilylation. The pure gas selectivities decrease from 9 to 3 for n-C4H10/N2 and from 26 to 9 for C3H8/N2.

Original languageEnglish
Pages (from-to)6316-6324
Number of pages9
JournalPolymer
Volume46
Issue number17
DOIs
Publication statusPublished - 28 Jul 2005
Externally publishedYes

Keywords

  • Permeability
  • Poly[1-phenyl-2-[p-(trimethylsilyl)phenyl]acetylene]
  • Poly[diphenylacetylene]

Cite this