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Gas Permeation Measurements On Small Polymer Specimens, Karen S. Burns
Gas Permeation Measurements On Small Polymer Specimens, Karen S. Burns
Chemistry & Biochemistry Theses & Dissertations
Mass spectrometry was used to measure oxygen and nitrogen permeabilities while polarography was used to measure oxygen permeabilities for several contact lens materials. Applicable sample holders were designed and fabricated to accommodate curved and flat specimens with surface areas of 0.5 cm2 and 1.0 cm2 and thicknesses between 0.025 mm and 0.500 mm. A prepared standard was used to calibrate the mass spectrometric analyses.
The oxygen permeability values determined by mass spectrometry were significantly greater than those determined by polarography. This was attributed to the phase boundary phenomena and the limiting oxygen permeance of water inherent in the …