Temperature effects on permeation of gases through packaging films

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015489.pdf
1991
Tokatlı, M. Kamil
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https://hdl.handle.net/11511/5207
Graduate School of Natural and Applied Sciences, Thesis

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Permeation of CO2 and O2 through a low density polyethylene film was studied with CO2-N2 MiXtures in the temperature range 263-283 K, and with CO2-O2-N2 mixtures in the range 257-313 K. The temperature dependence of the permeabilities of these gases agreed with the Arrhenius expression. The activation energy for carbon dioxide diffusion was between 3.53 x 10(4) and 3.74 x 10(4) J/mol; the activation energy for oxygen diffusion was 3.13 x 10(4) J/mol. The pre-exponential constant for oxygen was higher than t...
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Li2Ge7O15 (LGO) undergoes the ferroelectric - paraelectric transition at T-c =283.5K. The crystal structure of LGO is orthorhombic with the four formula units in the unit cell in the paraelectric phase (T < T-C) . The ferroelectric phase of LGO (T < T-C) has also the orthorhombic crystal structure with the pseudotrigonal symmetry of the unit group. In this study, we investigate the structural ferroelectric - paraelectric phase transition in Li2Ge7O15.Temperature effect on various physical properties such as...
Citation Formats
M. K. Tokatlı, “Temperature effects on permeation of gases through packaging films,” Middle East Technical University, 1991.
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