Surface defect formation in polyimide film via ion migration from glass substrate
| Autor: | Doo-Jin Byun, Kyuyoung Heo, Joo Hee Son, Wang-Eun Lee |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Polymers and Plastics Thermal decomposition Ionic bonding 02 engineering and technology Substrate (electronics) 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Casting 0104 chemical sciences Ion chemistry.chemical_compound Chemical engineering chemistry Mechanics of Materials Impurity Materials Chemistry Hydroxide 0210 nano-technology Polyimide |
| Zdroj: | Polymer Degradation and Stability. 173:109079 |
| ISSN: | 0141-3910 |
| DOI: | 10.1016/j.polymdegradstab.2020.109079 |
| Popis: | Migration of ions such as sodium from a glass surface to organic materials in contact is critical for the use of glass as a supporting material for film casting. In this study, we report the surface defect formation of annealed poly(pyromellitic dianhydride-co-4,4′-oxydianiline) (PMDA-ODA) film after detaching the film from soda-lime glass via ion migration. The defect was porous and sodium was observed as one of the major impurities in the defect. We propose that the defect forms as a result of the ion migration from glass and thermal decomposition of PMDA-ODA. The ions released from glass at a sufficiently high temperature form hydroxide compounds during the floating of the film on the water and readily attacks the imide ring at the glass-film interface. The ionic bonds are broken by thermal annealing and diffuse throughout the film, finally defects form by both segregation of ions to the film surface and PMDA-ODA decomposition. |
| Databáze: | OpenAIRE |
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