The role of nanodefects in gas barrier layers
Barrier performance of continuous coatings is determined by the defect population in the barrier layer. In this paper we consider two classes of defects: those in which the permeant does not interact with the barrier material, ‘macrodefects’, and those in which there is an interaction between the p...
| Main Authors: | , , , |
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| Format: | Conference item |
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Society of Vacuum Coaters
2018
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| _version_ | 1797098129280991232 |
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| author | Tobin, V Sim, A Suttle, H Assender, H |
| author_facet | Tobin, V Sim, A Suttle, H Assender, H |
| author_sort | Tobin, V |
| collection | OXFORD |
| description | Barrier performance of continuous coatings is determined by the defect population in the barrier layer. In this paper we consider two classes of defects: those in which the permeant does not interact with the barrier material, ‘macrodefects’, and those in which there is an interaction between the permeant and the barrier material, ‘nanodefects’, thus leading to a greater activation energy for permeation than that of permeation through the underlying polymer. If a barrier is improved by reducing the density of macrodefects then typically the transmission rate will decrease, and eventually the activation energy will increase as the proportion of permeation that takes place through the nanodefect population becomes significant. Recent studies, however, have highlighted examples in which a greater activation energy is associated with a greater permeation. This is explored in terms of a simple double-Arrhenius model, which highlights the significant contribution from nanodefect permeation even in cases in which the overall barrier performance is not that high. |
| first_indexed | 2024-03-07T05:05:14Z |
| format | Conference item |
| id | oxford-uuid:d9b41565-51c4-4aaf-a05c-5bb6f6c399a5 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T05:05:14Z |
| publishDate | 2018 |
| publisher | Society of Vacuum Coaters |
| record_format | dspace |
| spelling | oxford-uuid:d9b41565-51c4-4aaf-a05c-5bb6f6c399a52022-03-27T08:57:49ZThe role of nanodefects in gas barrier layersConference itemhttp://purl.org/coar/resource_type/c_5794uuid:d9b41565-51c4-4aaf-a05c-5bb6f6c399a5Symplectic Elements at OxfordSociety of Vacuum Coaters2018Tobin, VSim, ASuttle, HAssender, HBarrier performance of continuous coatings is determined by the defect population in the barrier layer. In this paper we consider two classes of defects: those in which the permeant does not interact with the barrier material, ‘macrodefects’, and those in which there is an interaction between the permeant and the barrier material, ‘nanodefects’, thus leading to a greater activation energy for permeation than that of permeation through the underlying polymer. If a barrier is improved by reducing the density of macrodefects then typically the transmission rate will decrease, and eventually the activation energy will increase as the proportion of permeation that takes place through the nanodefect population becomes significant. Recent studies, however, have highlighted examples in which a greater activation energy is associated with a greater permeation. This is explored in terms of a simple double-Arrhenius model, which highlights the significant contribution from nanodefect permeation even in cases in which the overall barrier performance is not that high. |
| spellingShingle | Tobin, V Sim, A Suttle, H Assender, H The role of nanodefects in gas barrier layers |
| title | The role of nanodefects in gas barrier layers |
| title_full | The role of nanodefects in gas barrier layers |
| title_fullStr | The role of nanodefects in gas barrier layers |
| title_full_unstemmed | The role of nanodefects in gas barrier layers |
| title_short | The role of nanodefects in gas barrier layers |
| title_sort | role of nanodefects in gas barrier layers |
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