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Title: Gas Permeability and Ideal Selectivity of Poly[bis-(phenoxy)phosphazene], Poly[bis-(4-tert-butylphenoxy)phosphazene], and Poly[bis-(3,5-di-tert-butylphenoxy)1.2(chloro)0.8phosphazene]

Abstract

Described in this paper is the synthesis and gas permeability characterization of poly[bis-(4-tert-butylphenoxy)phosphazene], and poly[bis-(3,5-di-tert-butylphenoxy)1.2(chloro)0.8phosphazene]. In general, linear chloro-containing polyphosphazenes are hydrolytically unstable. However, in this work, a novel polymer, poly[bis-(3,5-di-tert-butylphenoxy)1.2(chloro)0.8phosphazene], was observed to have an unusually high degree of hydrolytic stability and excellent membrane formation characteristics. Data derived from these polymers were compared to that of the more common poly[(bis-phenoxy)phosphazene]. These comparisons showed higher gas permeabilities and ideal separation factors for both of the alkyl-substituted phenoxy-phosphazenes, thus validating the concept that adding sterically bulky pendant groups to phosphazenes can affect membrane performance through disruption of orderly chain packing. Chemical characterization of these polymers was conducted using NMR spectroscopy, thermal analysis, helium pycnometry, elemental analysis, and multi-angle laser light scattering. Membranes were formed by solution casting and were characterized for their pure gas permeability using the following gases: H2, Ar, N2, O2, CH4, CO2, and H2S. Additionally, ideal selectivities of the significant O2/N2 and CO2/CH4 gas pairs are discussed.

Authors:
; ;
Publication Date:
Research Org.:
Idaho National Laboratory (INL)
Sponsoring Org.:
DOE - SC
OSTI Identifier:
912220
Report Number(s):
INEEL/JOU-03-00996
Journal ID: ISSN 0376-7388; JMESDO; TRN: US200801%%670
DOE Contract Number:  
DE-AC07-99ID-13727
Resource Type:
Journal Article
Journal Name:
Journal of Membrane Science
Additional Journal Information:
Journal Volume: 238; Journal Issue: 1-2; Journal ID: ISSN 0376-7388
Country of Publication:
United States
Language:
English
Subject:
37 - INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CASTING; GASES; HELIUM; LASERS; LIGHT SCATTERING; MEMBRANES; PERFORMANCE; PERMEABILITY; POLYMERS; SPECTROSCOPY; STABILITY; SYNTHESIS; THERMAL ANALYSIS; Gas permeability; Gas separations; Polyphosphazene

Citation Formats

Orme, Christopher J, Klaehn, John R, and Stewart, Frederick F. Gas Permeability and Ideal Selectivity of Poly[bis-(phenoxy)phosphazene], Poly[bis-(4-tert-butylphenoxy)phosphazene], and Poly[bis-(3,5-di-tert-butylphenoxy)1.2(chloro)0.8phosphazene]. United States: N. p., 2004. Web. doi:10.1016/j.memsci.2004.02.032.
Orme, Christopher J, Klaehn, John R, & Stewart, Frederick F. Gas Permeability and Ideal Selectivity of Poly[bis-(phenoxy)phosphazene], Poly[bis-(4-tert-butylphenoxy)phosphazene], and Poly[bis-(3,5-di-tert-butylphenoxy)1.2(chloro)0.8phosphazene]. United States. doi:10.1016/j.memsci.2004.02.032.
Orme, Christopher J, Klaehn, John R, and Stewart, Frederick F. Thu . "Gas Permeability and Ideal Selectivity of Poly[bis-(phenoxy)phosphazene], Poly[bis-(4-tert-butylphenoxy)phosphazene], and Poly[bis-(3,5-di-tert-butylphenoxy)1.2(chloro)0.8phosphazene]". United States. doi:10.1016/j.memsci.2004.02.032.
@article{osti_912220,
title = {Gas Permeability and Ideal Selectivity of Poly[bis-(phenoxy)phosphazene], Poly[bis-(4-tert-butylphenoxy)phosphazene], and Poly[bis-(3,5-di-tert-butylphenoxy)1.2(chloro)0.8phosphazene]},
author = {Orme, Christopher J and Klaehn, John R and Stewart, Frederick F},
abstractNote = {Described in this paper is the synthesis and gas permeability characterization of poly[bis-(4-tert-butylphenoxy)phosphazene], and poly[bis-(3,5-di-tert-butylphenoxy)1.2(chloro)0.8phosphazene]. In general, linear chloro-containing polyphosphazenes are hydrolytically unstable. However, in this work, a novel polymer, poly[bis-(3,5-di-tert-butylphenoxy)1.2(chloro)0.8phosphazene], was observed to have an unusually high degree of hydrolytic stability and excellent membrane formation characteristics. Data derived from these polymers were compared to that of the more common poly[(bis-phenoxy)phosphazene]. These comparisons showed higher gas permeabilities and ideal separation factors for both of the alkyl-substituted phenoxy-phosphazenes, thus validating the concept that adding sterically bulky pendant groups to phosphazenes can affect membrane performance through disruption of orderly chain packing. Chemical characterization of these polymers was conducted using NMR spectroscopy, thermal analysis, helium pycnometry, elemental analysis, and multi-angle laser light scattering. Membranes were formed by solution casting and were characterized for their pure gas permeability using the following gases: H2, Ar, N2, O2, CH4, CO2, and H2S. Additionally, ideal selectivities of the significant O2/N2 and CO2/CH4 gas pairs are discussed.},
doi = {10.1016/j.memsci.2004.02.032},
journal = {Journal of Membrane Science},
issn = {0376-7388},
number = 1-2,
volume = 238,
place = {United States},
year = {2004},
month = {7}
}