Atmospheric gas concentrations in polymers
Authors
Centanni, Michael Anthony
ORCID
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Other Contributors
Casabella, Philip Anthony
Levinger, Joseph S., 1921-
Brown, E.
Levy, Roland A. (Roland Albert), 1944-
Janz, George J.
Levinger, Joseph S., 1921-
Brown, E.
Levy, Roland A. (Roland Albert), 1944-
Janz, George J.
Issue Date
1977-05
Keywords
Solid state physics
Degree
PhD
Terms of Use
This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Full Citation
Abstract
Paramagnetic oxygen molecules, present as impurities, have been detected by pulsed nuclear magnetic resonance techniques, magnetic susceptibility measurements, and mass measurements in polystyrene, linear polyethylene, and branched polyethylene. The spin-lattice relaxation time (T₁) of the protons in the polymers changes from about one second to hundreds of seconds when oxygen is removed from the samples by gentle baking in a vacuum. The baked samples are subsequently exposed to air for certain intervals of time, and then T₁ is again determined. This technique has yielded information concerning the relative-rates at which molecular oxygen diffuses into the three polymers. In fact, molecular oxygen is seen to diffuse much more rapidly into the two polyethylene samples than into the polystyrene sample.
Description
May 1977
School of Science
School of Science
Department
Dept. of Physics
Publisher
Rensselaer Polytechnic Institute, Troy, NY
Relationships
Rensselaer Theses and Dissertations Online Collection
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