Triamine-modified polymides having improved processability and low melt flow viscocity

US6262223A · kind A · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

• Michael A. Meador · Strongsville, US
• Baochau N. Nguyen · North Royalton, US
• Ronald Eby · Akron, US

Key dates

• Filing date: Feb 1, 2000
• Grant date: Jul 17, 2001
• Expiry date: Feb 1, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G73/101
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Addition-cured polyimides that contain the reaction product of an aromatic triamine or trianhydride analogue thereof, a reactive end group such as 5-norbornene-2, 3-dicarboxylic acid, ester derivatives of 5-norbornene-2,3-dicarboxylic acid, anhydride derivatives of 5-norbornene-2,3-dicarboxylic acid, or 4-phenylethynylphthalic anhydride, an aromatic diamine, and a dialkyl ester of an aromatic tetracarboxylic acid. The resultant starlike polyimides exhibit lower melt flow viscosity than its linear counterparts, providing for improved processability of the polyimide. Also disclosed are methods for the synthesis of these polyimides as well as composite structures formed using these polyimides.