Atmospheric plasma deposition of transparent coatings on polymers
Abstract/Contents
- Abstract
- Atmospheric plasma enables plasma assisted coating deposition in ambient air at low temperature on large and/or complex geometry substrates. It has huge potential for coating synthesis and materials surface treatment at lower cost without the necessity of vacuum equipment, for applications of energy, display, aerospace, etc. In this dissertation, I present the results of atmospheric plasma deposition of transparent hard protective coatings on polymers. In order to deposit high quality coatings, we find that the interaction between atmospheric plasma, coating, and polymer substrate should all be optimized. Firstly, I studied the interaction between atmospheric plasma and polymer substrates. Atmospheric plasma was used to pretreat polycarbonate and stretched poly(methyl methacrylate) surfaces in order to enhance the adhesion of polymers to inorganic coatings. The treatment time and the chemical structure of the polymers were found to be important factors. For polycarbonate, a short treatment increased the adhesion energy by four times, while longer treatment resulted in low molecular-weight species formation and decreased adhesion. Next, I deposited dense silica coatings on polymers using atmospheric plasma. The coating deposition rate, molecular network structure, density, Young's modulus and adhesion to polymers exhibited a strong dependence on the precursor delivery temperature and rate, and the functionality and number of silicon atoms in the precursor molecules. The highest Young's modulus of the atmospheric plasma silica was four times higher than that of commercial sol-gel polysiloxane coatings. After that, I successfully deposited carbon-bridged hybrid organosilicate coating using atmospheric plasma, with the ethyl bridges incorporated in the silicate network under the ambient air environment. These coatings doubled the adhesion energy to polymers due to the molecular bridging effect, compared to commercial sol-gel polysiloxane coatings. Finally, I deposited a hard, adhesive, and highly transparent bilayer structure on polymers, with the bottom layer highly adhesive to polymer and the top layer hard to resist scratches. The method overcomes the challenge of fabricating coatings with high mechanical and interfacial properties in a one-step process. The bilayer structure exhibited ~ 100% transmittance in the visible wavelength range and no sacrifice of the hard or adhesive properties of the single sub-layers.
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 | Cui, Linying |
|---|---|
| Associated with | Stanford University, Department of Applied Physics. |
| Primary advisor | Dauskardt, R. H. (Reinhold H.) |
| Primary advisor | Reis, David A, 1970- |
| Thesis advisor | Dauskardt, R. H. (Reinhold H.) |
| Thesis advisor | Reis, David A, 1970- |
| Thesis advisor | Dubois, Geraud |
| Advisor | Dubois, Geraud |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Linying Cui. |
|---|---|
| Note | Submitted to the Department of Applied Physics. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2014. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2014 by Linying Cui
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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