NASA NTRS · 19950013991
A direct process for preparing semi-crystalline polyimides
Abstract
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 C to about 140 C to form a polyimide precipitate. The polyimide precipitate was recovered as a semi-crystalline polyimide powder.
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Chang, Alice C., St.clair, Terry L.. 1994-09-01. A direct process for preparing semi-crystalline polyimides. https://ntrs.nasa.gov/citations/19950013991
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