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Direct process for preparing semi-crystalline polyimides
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 1995 |
| Description | The invention is a direct process for preparing semi-crystalline polyimides. This process comprises the steps of: providing a polar aprotic solvent, adding a dianhydride and a diamine to the solvent to form a mixture, stirring the mixture at ambient temperature, and adding glacial acetic acid to the mixture to provide a ratio of polar aprotic solvent to glacial acetic acid which ranges from about 90 to 10 to about 75 to 25 by volume to form a solution. The solution was heated to a range from about 110.degree. C. to about 140.degree. C. to form a polyimide precipitate. The polyimide precipitate was recovered as a semi-crystalline polyimide powder. |
| File Size | 516134 |
| Page Count | 6 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20080004746 |
| Archival Resource Key | ark:/13960/t0rr6s494 |
| Language | English |
| Publisher Date | 1995-11-07 |
| Access Restriction | Open |
| Subject Keyword | Nonmetallic Materials Patents Crystallinity Polyimides Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Patent |
