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Title: Mass spectrometer based gas permeation apparatus

Abstract

A newly constructed instrument to measure diffusion and permeation rates in polymeric materials is described. This instrument utilizes a quadrupole mass spectrometer as a sensitive flow meter to detect the flux of gas through a polymer sheet that is subjected to a pressure gradient. The permeation coefficient is obtained from the steady state flux and the diffusion coefficient from the kinetics of reaching the steady state in a sheet that is initially devoid of permeant. The diffusion coefficient depends solely on the time development of the mass spectrometer signal and calibration is not required. To obtain the actual flux, however, the mass spectrometer output is calibrated by effusing a known quantity of the test gas into the spectrometer through an orifice. Enclosure of the sample cell in an oven permits the temperature dependences of the diffusion parameters to be derived. The instrument was tested by measuring the diffusion behavior of helium in ethylenepropylene rubber as a function of temperature and the results agree well with literature values.

Authors:
;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (USA)
OSTI Identifier:
5756735
Report Number(s):
SAND-85-0402
ON: DE85011176
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 47 OTHER INSTRUMENTATION; PERMEABILITY; MEASURING INSTRUMENTS; POLYMERS; DIFFUSION; GASES; MASS SPECTROMETERS; FLUIDS; SPECTROMETERS; 360404* - Materials- Polymers & Plastics- Physical Properties- (-1987); 440300 - Miscellaneous Instruments- (-1989)

Citation Formats

Keenan, M R, and Reich, J E. Mass spectrometer based gas permeation apparatus. United States: N. p., 1985. Web.
Keenan, M R, & Reich, J E. Mass spectrometer based gas permeation apparatus. United States.
Keenan, M R, and Reich, J E. Mon . "Mass spectrometer based gas permeation apparatus". United States.
@article{osti_5756735,
title = {Mass spectrometer based gas permeation apparatus},
author = {Keenan, M R and Reich, J E},
abstractNote = {A newly constructed instrument to measure diffusion and permeation rates in polymeric materials is described. This instrument utilizes a quadrupole mass spectrometer as a sensitive flow meter to detect the flux of gas through a polymer sheet that is subjected to a pressure gradient. The permeation coefficient is obtained from the steady state flux and the diffusion coefficient from the kinetics of reaching the steady state in a sheet that is initially devoid of permeant. The diffusion coefficient depends solely on the time development of the mass spectrometer signal and calibration is not required. To obtain the actual flux, however, the mass spectrometer output is calibrated by effusing a known quantity of the test gas into the spectrometer through an orifice. Enclosure of the sample cell in an oven permits the temperature dependences of the diffusion parameters to be derived. The instrument was tested by measuring the diffusion behavior of helium in ethylenepropylene rubber as a function of temperature and the results agree well with literature values.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {4}
}

Technical Report:
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