Hybrid organic-inorganic films for high-performance adhesive bonding
Abstract/Contents
- Abstract
- Hybrid organic-inorganic materials can be engineered to exhibit unique property sets intermediate to oxides and polymers by the intermixing and covalent bonding of organic and inorganic chemical components at the molecular scale. This class of materials has enabled a range of new technologies in diverse applications including protective coatings, adhesion promoting layers, ultra-low-k dielectrics and optical waveguides. This dissertation presents results from several studies investigating the correlation between hybrid molecular structure and fracture properties. A low-cost, low-temperature sol-gel approach is utilized to synthesize ZrOx/epoxysilane hybrid films for adhesion promoting applications across a wide range of metal oxide / epoxy interfaces. XPS depth profiling reveals a unique compositionally graded structure capable of forming durable bonds between metal oxides and structural adhesive organic resins. The influence of the underlying substrate isoelectric point on the synthesis and deposition of compositionally graded hybrid networks is investigated. Subsequently, linear elastic fracture mechanics experiments are utilized to develop a correlation between substrate isoelectric point and fracture properties, showing increasing adhesion with decreasing isoelectric point. Using bulk metallic glass substrates, the fracture properties of hybrid organic-inorganic films are optimized by investigating variations in sol-gel synthesis parameters. In addition to significant increases in adhesion strength, the efficacy of hybrid layers in mitigating moisture-assisted debonding is demonstrated. Finally, the application of hybrid organic-inorganic adhesion promoting layers is explored in titanium composite (TiGr) aerospace laminates. The roles of mode mixity and fiber orientation under monotonic and fatigue loading are investigated, revealing critical effects on failure pathways and resultant fracture resistance.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2014 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Yang, Jeffrey |
|---|---|
| Associated with | Stanford University, Department of Materials Science and Engineering. |
| Primary advisor | Dauskardt, R. H. (Reinhold H.) |
| Thesis advisor | Dauskardt, R. H. (Reinhold H.) |
| Thesis advisor | Melosh, Nicholas A |
| Thesis advisor | Nix, William D |
| Advisor | Melosh, Nicholas A |
| Advisor | Nix, William D |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Jeffrey Yang. |
|---|---|
| Note | Submitted to the Department of Materials Science and Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2014. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2014 by Jeffrey Yang
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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