Towards colorless polyimide/silica hybrids for flexible substrates
| Autor: | Mikhail Kovalev, Chungkun Cho, Fedosya Kalinina, Woo Jin Bae, Minsang Kim |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Birefringence Polymers and Plastics Annealing (metallurgy) Organic Chemistry Oxide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Miscibility Silane Thermal expansion 0104 chemical sciences chemistry.chemical_compound chemistry Materials Chemistry Thermal stability Composite material 0210 nano-technology Polyimide |
| Zdroj: | Polymer. 105:124-132 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/j.polymer.2016.10.023 |
| Popis: | In this work, we report highly transparent flexible polyimide/silica hybrids with low coefficient of thermal expansion (CTE) comparable to that of a glass, low optical birefringence and high thermal stability over 400 °C. We started from the polyimide system based on 2,2′-bis-(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA)/2,2′-bis-(trifluoromethyl)-4,4′-diaminobiphenyl (TFDB), which has high optical transparency for aromatic polyimides, utilized well-known simple strategy of using silane end-capped oligomeric polyamic acid and silica sol-gel reaction to increase the miscibility between PI and silica, and finely tuned the property by control of molecular weight and processing condition. The resulting hybrid film showed homogeneous surface after oxide deposition and annealing, and passed the repeated folding/unfolding test with more than 200,000 cycles. These finely tuned hybrid films are promising candidate for flexible transparent substrate especially for high temperature (>400 °C) electronic and optoelectronic manufacturing processes. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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