Measuring and testing – With fluid pressure – Porosity or permeability
Patent
1988-08-26
1990-07-31
Williams, Hezron E.
Measuring and testing
With fluid pressure
Porosity or permeability
G01N 1508
Patent
active
049441809
ABSTRACT:
A system for measuring the permeation rate of organic molecules across a polymer film, which includes a membrane chamber, an electron impact mass spectrometer and a flow-through hollow fiber probe for providing an interface between the membrane chamber and the mass spectrometer. The membrane chamber supports the polymer film sample to be tested, and permits one side of the sample to be exposed to a vapor containing a known concentration of organic molecules under substantially atmospheric pressure and controlled environmental conditions on both the upstream and downstream sides of the sample. The membrane chamber features a unique permeation cell and sample holder arrangement which employs a pair of adhesive backed cards to sandwich the sample and maintain a permanent desirable alignment of the sample.
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Rulf Donald C.
Tou James C.
Roskos Joseph W.
The Dow Chemical Company
Williams Hezron E.
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