Preparation of water-resistant antifog hard coatings on plastic substrate
| Autor: | Ching-Chung Chen, Trong-Ming Don, Hsu-Hsien Chang, Liao-Ping Cheng, Feng-Hsi Huang, Chao-Ching Chang |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Bilayer Colloidal silica Surfaces and Interfaces engineering.material Condensed Matter Physics Methacrylate Contact angle chemistry.chemical_compound Coating Chemical engineering Pulmonary surfactant chemistry Superhydrophilicity Electrochemistry engineering General Materials Science Isophorone diisocyanate Spectroscopy |
| Zdroj: | Langmuir : the ACS journal of surfaces and colloids. 28(49) |
| ISSN: | 1520-5827 |
| Popis: | A novel water resistant antifog (AF) coating for plastic substrates was developed, which has a special hydrophilic/hydrophobic bilayer structure. The bottom layer, acting both as a mechanical support and a hydrophobic barrier against water penetration, is an organic-inorganic composite comprising colloidal silica embedded in a cross-linked network of dipentaethritol hexaacrylate (DPHA). Atop this layer, an AF coating is applied, which incorporates a superhydrophilic species synthesized from Tween-20 (surfactant), isophorone diisocyanate (coupling agent), and 2-hydroxyethyl methacrylate (monomer). Various methods, e.g., FTIR, SEM, AFM, contact angle, and steam test, were employed to characterize the prepared AF coatings. The results indicated that the size and the continuity of the hydrophilic domains on the top surface increased with increasing added amount of T20, however, at the expense of hardness, adhesiveness, and water resistivity. The optimal T20 content was found to be 10 wt %, at which capacity the resultant AF coating was transparent and wearable (5H, hardness) and could be soaked in water for 7 days at 25 °C without downgrading of its AF capability. |
| Databáze: | OpenAIRE |
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