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

The permeabilities of He, H 2, N 2, O 2, CO 2, CH 4, C 2H 6, C 3H 8, and n-C 4H 10 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), an...

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Veröffentlicht in:Polymer (Guilford) 2005-08, Vol.46 (17), p.6316-6324
Hauptverfasser: Raharjo, Roy D., Lee, Hyuck J., Freeman, Benny D., Sakaguchi, Toshikazu, Masuda, Toshio
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container_end_page 6324
container_issue 17
container_start_page 6316
container_title Polymer (Guilford)
container_volume 46
creator Raharjo, Roy D.
Lee, Hyuck J.
Freeman, Benny D.
Sakaguchi, Toshikazu
Masuda, Toshio
description The permeabilities of He, H 2, N 2, O 2, CO 2, CH 4, C 2H 6, C 3H 8, and n-C 4H 10 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-C 4H 10/N 2 and from 26 to 9 for C 3H 8/N 2.
doi_str_mv 10.1016/j.polymer.2005.05.093
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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. 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subjects Applied sciences
Exact sciences and technology
Miscellaneous
Organic polymers
Permeability
Physicochemistry of polymers
Poly[1-phenyl-2-[ p-(trimethylsilyl)phenyl]acetylene]
Poly[diphenylacetylene]
Properties and characterization
title Pure gas and vapor permeation properties of poly[1-phenyl-2-[ p-(trimethylsilyl)phenyl]acetylene] (PTMSDPA) and its desilylated analog, poly[diphenylacetylene] (PDPA)
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