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Polyimides containing the cyclobutene-3,4-dione moiety
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 1993 |
| Description | In the present invention, linear aromatic polyimides containing the cyclobutene-3,4-dione moiety were produced from the reaction of a substituted or unsubstituted 1,2-bis(4-aminoanilino) cyclobutene-3,4-dione (SQDA) with various aromatic dianhydrides. These polymers had high molecular weights and their glass transition temperatures (Tgs) were greater than 500 C. Despite the very high Tg, these polymers exhibited excellent adhesion to glass. In addition, the films of these polyimides increased in flexibility with increasing cure temperatures. The novelty of this invention lies in the linear aromatic polyimide containing the cyclobutene-3,4-dione moiety. The presence of this moiety causes such changes in properties as Tgs greater than 500 C, excellent adhesion to glass, and increased flexibility with increasing cure temperatures. |
| File Size | 361838 |
| Page Count | 5 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19930016810 |
| Archival Resource Key | ark:/13960/t3nw4cq5c |
| Language | English |
| Publisher Date | 1993-05-18 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Anhydrides Inventions Polyimides Curing Adhesion Flexibility Glass Transition Temperature Molecular Weight Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
