| タイトル | Heat, Moisture and Chemical Resistant Polyimide Compositions and Methods for Making and Using Them |
| 著者（英） | Pater, Ruth H. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 2004-08-17 |
| 言語 | eng |
| 内容記述 | Polyimides having a desired combination of high thermo-oxidative stability, low moisture absorption and excellent chemical and corrosion resistance are prepared by reacting a mixture of compounds including (a) 3,3',4,4'- benzophenonetetracarboxylic dianhydride (BTDA), (b) 3,4'- oxydianiline (3,4'-ODA), and (c) 5-norbornene-2,3- dicarboxylic anhydride (NA) in a high boiling, aprotic solvent to give 5 to 35% by weight of polyamic acid solution. The ratio of (a), (b), and (c) is selected to afford a family of polyimides having different molecular weights and properties. The mixture first forms a polyamic acid precursor. Upon heating at or above 300 C, the polyamic acids form polyimides, which are particularly suitable for use as a high temperature coating, adhesive, thin film, or composite matrix resin. |
| NASA分類 | Chemistry and Materials (General) |
| 権利 | No Copyright |
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