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Title: Mechanisms of gas permeation through polymer membranes. Progress report, July 1, 1985-May 31, 1986. [CH/sub 4/, C/sub 2/H/sub 6/, n-C/sub 4/H/sub 10/, CO/sub 2/ in poly(n-butyl methacrylate)]

Abstract

The work described is concerned with the significant changes in these mechanisms in the glass-transition range. Permeability, diffusion, and solubility coefficients for CH/sub 4/, C/sub 2/H/sub 4/, C/sub 2/H/sub 6/, and n-C/sub 4/H/sub 10/ in poly(n-butyl methacrylate) (PnBMA) were determined at pressures up to 25 atm and from -14/sup 0/ to 50/sup 0/C. Solubility was also determined for CO/sub 2/ in PnBMA at pressures up to 25 atm and at -10/sup 0/ and 30/sup 0/C. No significant changes were observed in the pressure (or concentration) and temperature dependence of the permeability, diffusion, and solubility coefficients for CH/sub 4/, C/sub 2/H/sub 6/, and n-C/sub 4/H/sub 10/ in the glass-transition range of PnBMA, or when the temperature was lowered below T/sub g/. Moreover, these gas/polymer systems do not exhibit below T/sub g/ the usual ''dual-mode'' sorption behavior of gases in glassy polymers. The solubility isotherm for CO/sub 2/ in PnBMA at -10/sup 0/C and lower pressures suggests incipient dual-mode sorption. Results are exceptions to dual-mode sorption behavior and may be due to small difference in the coefficients of thermal expansion of PnBMA above and below T/sub g/. This indicates that the unrelaxed domains in glassy PnBMA are very small. A ''free-volume'' mechanismmore » describes the dependence of C/sub 2/H/sub 6/ permeability on P, T both above and below the glass transition of PnBMA. Adsorption/desorption kinetics are Fickian.« less

Authors:
; ;
Publication Date:
Research Org.:
Syracuse Univ., NY (USA). Dept. of Chemical Engineering and Materials Science
OSTI Identifier:
5571129
Report Number(s):
DOE/ER/05015-T3
ON: DE86013368
DOE Contract Number:  
AC02-78ER05015
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BUTANE; DIFFUSION; SOLUBILITY; CARBON DIOXIDE; ETHANE; MEMBRANES; PERMEABILITY; SOLVENT PROPERTIES; METHANE; POLYMERS; ADSORPTION; DESORPTION; RESEARCH PROGRAMS; TEMPERATURE DEPENDENCE; THICKNESS; TRANSITION TEMPERATURE; ALKANES; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; DIMENSIONS; HYDROCARBONS; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SORPTION; THERMODYNAMIC PROPERTIES; 360404* - Materials- Polymers & Plastics- Physical Properties- (-1987)

Citation Formats

Stern, S A, Vakil, U, and Zhou, S. Mechanisms of gas permeation through polymer membranes. Progress report, July 1, 1985-May 31, 1986. [CH/sub 4/, C/sub 2/H/sub 6/, n-C/sub 4/H/sub 10/, CO/sub 2/ in poly(n-butyl methacrylate)]. United States: N. p., 1986. Web.
Stern, S A, Vakil, U, & Zhou, S. Mechanisms of gas permeation through polymer membranes. Progress report, July 1, 1985-May 31, 1986. [CH/sub 4/, C/sub 2/H/sub 6/, n-C/sub 4/H/sub 10/, CO/sub 2/ in poly(n-butyl methacrylate)]. United States.
Stern, S A, Vakil, U, and Zhou, S. 1986. "Mechanisms of gas permeation through polymer membranes. Progress report, July 1, 1985-May 31, 1986. [CH/sub 4/, C/sub 2/H/sub 6/, n-C/sub 4/H/sub 10/, CO/sub 2/ in poly(n-butyl methacrylate)]". United States.
@article{osti_5571129,
title = {Mechanisms of gas permeation through polymer membranes. Progress report, July 1, 1985-May 31, 1986. [CH/sub 4/, C/sub 2/H/sub 6/, n-C/sub 4/H/sub 10/, CO/sub 2/ in poly(n-butyl methacrylate)]},
author = {Stern, S A and Vakil, U and Zhou, S},
abstractNote = {The work described is concerned with the significant changes in these mechanisms in the glass-transition range. Permeability, diffusion, and solubility coefficients for CH/sub 4/, C/sub 2/H/sub 4/, C/sub 2/H/sub 6/, and n-C/sub 4/H/sub 10/ in poly(n-butyl methacrylate) (PnBMA) were determined at pressures up to 25 atm and from -14/sup 0/ to 50/sup 0/C. Solubility was also determined for CO/sub 2/ in PnBMA at pressures up to 25 atm and at -10/sup 0/ and 30/sup 0/C. No significant changes were observed in the pressure (or concentration) and temperature dependence of the permeability, diffusion, and solubility coefficients for CH/sub 4/, C/sub 2/H/sub 6/, and n-C/sub 4/H/sub 10/ in the glass-transition range of PnBMA, or when the temperature was lowered below T/sub g/. Moreover, these gas/polymer systems do not exhibit below T/sub g/ the usual ''dual-mode'' sorption behavior of gases in glassy polymers. The solubility isotherm for CO/sub 2/ in PnBMA at -10/sup 0/C and lower pressures suggests incipient dual-mode sorption. Results are exceptions to dual-mode sorption behavior and may be due to small difference in the coefficients of thermal expansion of PnBMA above and below T/sub g/. This indicates that the unrelaxed domains in glassy PnBMA are very small. A ''free-volume'' mechanism describes the dependence of C/sub 2/H/sub 6/ permeability on P, T both above and below the glass transition of PnBMA. Adsorption/desorption kinetics are Fickian.},
doi = {},
url = {https://www.osti.gov/biblio/5571129}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {5}
}

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