Positron Annihilation Spectroscopy of High Performance Polymer Films under CO2 Pressure

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Positron annihilation Lifetime and Doppler broadening measurements are reported for six polymer films as a function of carbon dioxide absolute pressure ranging from 0 to 45 psi. Since the polymer films were thin and did not absorb all positrons, corrections were made in the lifetime analysis for the absorption of positrons in the positron source and sample holder using the Monte Carlo transport code MCNP. Different polymers are found to behave differently. Some polymers studied form positronium and some, such as the polyimide structures, do not. For those samples that form positronium an interpretation in terms of free volume is ... continued below

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Quarles, C.A.; Klaehn, John R.; Peterson, Eric S. & Urban-Klaehn, Jagoda M. August 1, 2010.

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Positron annihilation Lifetime and Doppler broadening measurements are reported for six polymer films as a function of carbon dioxide absolute pressure ranging from 0 to 45 psi. Since the polymer films were thin and did not absorb all positrons, corrections were made in the lifetime analysis for the absorption of positrons in the positron source and sample holder using the Monte Carlo transport code MCNP. Different polymers are found to behave differently. Some polymers studied form positronium and some, such as the polyimide structures, do not. For those samples that form positronium an interpretation in terms of free volume is possible; for those that don’t form positronium, further work is needed to determine how best to describe the behavior in terms of the bulk positron annihilation parameters. Some polymers exhibit changes in positron lifetime and intensity under CO2 pressure which may be described by the Henry or Langmuir sorption models, while the positron response of other polymers is rather insensitive to the CO2 pressure. The results demonstrate the usefulness of positron annihilation spectroscopy in investigating the sorption of CO2 into various polymers at pressures up to about 3 atm.

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  • Conference on the Application of Accelerators in Research and Industry (CAARI) - 2010,Ft. Worth, TX,08/08/2010,08/13/2010

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  • Report No.: INL/CON-10-19455
  • Grant Number: DE-AC07-05ID14517
  • Office of Scientific & Technical Information Report Number: 993191
  • Archival Resource Key: ark:/67531/metadc1013682

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  • August 1, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Nov. 3, 2017, 5:23 p.m.

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Quarles, C.A.; Klaehn, John R.; Peterson, Eric S. & Urban-Klaehn, Jagoda M. Positron Annihilation Spectroscopy of High Performance Polymer Films under CO2 Pressure, article, August 1, 2010; Idaho. (digital.library.unt.edu/ark:/67531/metadc1013682/: accessed December 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.