Organo-soluble phosphinated polyimides from asymmetric diamines

✍ Scribed by Ching Hsuan Lin; Sheng Lung Chang; Li An Peng; Siao Ping Peng; Yu Hao Chuang

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 690 KB
• Volume: 51
• Category: Article
• ISSN: 0032-3861
• DOI: 10.1016/j.polymer.2010.05.059

✦ Synopsis

Two new asymmetric diamines (1e2) were prepared via a facile, one-pot procedure. Based on diamine (1e2), a series of asymmetric polyimides (3e4) were prepared in NMP/xylene by high-temperature solution polymerization. The resulting polyimides are readily soluble in some organic solvents, and can be solution casted into flexible and creasable films. An intramolecular charge complex mechanism was proposed to the structureeoptical transparency relationship. Polyimides 3e4 display high-Tg (319e401 C), high moduli (2.40e7.20 GPa), moderate coefficient of thermal expansion (38e53 ppm/ C), and excellent flame retardancy. These results show that the introduction of the asymmetric structure is an effective way to improve organo-solubility while maintaining thermal properties. Because of these properties, polyimides 3e4 can be considered as excellent high-Tg and flame-retardant materials for microelectronic applications.