Jingling Yan, Zhen Wang, Lian‐xun Gao
Oct 6, 2006
Citations
0
Influential Citations
36
Citations
Journal
Macromolecules
Abstract
A novel diamine, 3,3‘-bis(N-aminophthalimide) (BAPI), was prepared from 3,3‘-bis(N-phenylphthalimide). Its structure was determined via IR, 1H NMR, 15N NMR, elemental analysis, and single-crystal X-ray diffraction analysis. A series of homo- and copolyimides were synthesized by a conventional one-step method in p-chlorophenol. The characteristic IR absorption bands of hydrazine-based imide groups were near 1780, 1750, 1350, 1100, and 730 cm-1. The polymers showed good solubility in polar aprotic solvents and phenols at room temperature. The temperatures of 5% weight loss (T5%) of the polyimides ranged from 495 to 530 °C in air. DMTA analyses indicated that the glass-transition temperatures (Tgs) of the polyimides were in the range 371−432 °C. These polymers had cutoff wavelengths between 350 and 400 nm. The polyimide films of 6FDA/BAPI and 4,4‘-HQPDA/BAPI were colorless; other films were pale yellow or yellow.