Aromatic Polyazomethines Containing Phenylquinoxaline Rings
| Autor: | Burkhard Schulz, Elena Hamciuc, Maria Bruma, Frank W. Mercer, Thomas Köpnick |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
chemistry.chemical_classification
Condensation polymer Materials science Polymers and Plastics Organic Chemistry Thermal decomposition 02 engineering and technology Dielectric Polymer 021001 nanoscience & nanotechnology Dimethylacetamide chemistry.chemical_compound 020401 chemical engineering chemistry Chemical engineering Materials Chemistry Organic chemistry Wafer Thermal stability 0204 chemical engineering 0210 nano-technology Glass transition |
| Zdroj: | High Performance Polymers. 12:277-284 |
| ISSN: | 1361-6412 0954-0083 |
| DOI: | 10.1088/0954-0083/12/2/303 |
| Popis: | New aromatic polyazomethines have been synthesized by polycondensation of terephthalic dialdehyde with aromatic diamines containing preformed phenylquinoxaline rings. These polymers are easily soluble in polar aprotic solvents such as N-methylpyrrolidinone and dimethylacetamide, and even in less polar liquids like tetrahydrofurane and can be cast into thin flexible films or coatings from such solutions. They show high thermal stability with the initial decomposition temperature being above 500 °C and glass transition temperatures in the range 240–292 °C. The very thin polymer coatings deposited by a spin-coating technique onto silicon wafers show a very smooth, pinhole-free surface in atomic force microscopy investigations. The free-standing films of 20–30 μm thickness show a low dielectric constant, which is in the range 3.25–3.56, which is promising for a future application as high-performance dielectrics. |
| Databáze: | OpenAIRE |
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