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Titolo:
Effects of hard-segment polymers on CO2/N-2 gas-separation properties of poly(ethylene oxide)-segmented copolymers
Autore:
Yoshino, M; Ito, K; Kita, H; Okamoto, KI;
Indirizzi:
Yamaguchi Univ, Fac Engn, Dept Adv Mat Sci & Engn, Ube, Yamaguchi 7558611,Japan Yamaguchi Univ Ube Yamaguchi Japan 7558611 , Ube, Yamaguchi 7558611,Japan
Titolo Testata:
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
fascicolo: 13, volume: 38, anno: 2000,
pagine: 1707 - 1715
SICI:
0887-6266(20000701)38:13<1707:EOHPOC>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
PERMEABILITY; MORPHOLOGY; PERMSELECTIVITY; POLYURETHANES; POLYIMIDES; MEMBRANES;
Keywords:
CO2/N-2; gas separation; PEO-segmented polyurethane; microphase separation; polyimide; polyamide; poly(ethylene oxide); membrane;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Okamoto, KI Yamaguchi Univ, Fac Engn, Dept Adv Mat Sci & Engn, Ube, Yamaguchi 7558611,Japan Yamaguchi Univ Ube Yamaguchi Japan 7558611 uchi 7558611,Japan
Citazione:
M. Yoshino et al., "Effects of hard-segment polymers on CO2/N-2 gas-separation properties of poly(ethylene oxide)-segmented copolymers", J POL SC PP, 38(13), 2000, pp. 1707-1715

Abstract

Poly(ethylene oxide)-segmented polyurethanes (PEO-PUs) and polyamides (PEO-PAs) were prepared, and their morphology and CO2/N-2 separation propertieswere investigated in comparison with those of PEG-segmented polyimides (PEO-PIs). The contents of the hard and soft segments in the soft and hard domains, W-HS and W-SH, respectively, were estimated from glass-transition temperatures with the Fox equation. The phase separation of the PEO domains depended on the kind of hard-segment polymer; that is, W-HS was in the order PU > PA much greater than PI for a PEO block length (n) of 45-52. The larger W-HS of PUs and PAs was due to hydrogen bonding between the oxygen of PEOand the NH group of urethane or amide. The CO2/N-2 separation properties depended on the kind of hard-segment polymer. Compared with PEG-PIs, PEO-PUsand PEG-PA had much smaller CO, permeabilities because of much smaller CO2diffusion coefficients and somewhat smaller CO, solubilities. PEO-PUs alsohad a somewhat smaller permselectivity because of a smaller solubility selectivity. This was due to the larger W-HS of PEO-PUs and PEO-PAs, that is, a greater contamination of PEO domains with hard urethane and amide units. For PEO-PIs, with a decrease in n to 23 and 9, W-HS became large and CO2 permeability decreased significantly, but the permselectivity was still at a high level of more than 50 at 35 degrees C. (C) 2000 John Wiley & Sons, Inc.

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Documento generato il 11/07/20 alle ore 15:06:27