New organosoluble and thermally stable poly(urea-imide)s prepared from one-pot polyaddition reactions
✍ Scribed by Hossein Behniafar; Mehrtaj Amrai
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 234 KB
- Volume
- 109
- Category
- Article
- ISSN
- 0021-8995
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
A new class of aromatic poly(urea‐imide)s having biphenylene pendant group was prepared by the diphenyl azidophosphate (DPAP) activated one‐pot polyaddition reaction of a preformed imide ring‐containing dicarboxylic acid, 4‐p‐biphenyl‐2,6‐bis(4‐trimellitimidophenyl)pyridine (1) with various aromatic diamines. A model compound was also synthesized by the reaction of diimide‐dicarboxylic acid 1 with two mole equivalents of aniline. In this direct method the polymers were prepared by polyaddition reactions of the in situ‐formed diisocyanate with the aromatic diamines. The inherent viscosities of the polymers were measured in the range of 0.11–0.15 dL g^−1^. The ultraviolet λ~max~ values of the poly(urea‐imide)s were also determined. Furthermore, crystallinity of the resultant polymers was evaluated by wide‐angle X‐ray diffraction method, and they exhibited nearly a noncrystalline nature. All of the resulting polymers exhibited excellent solubility in common polar solvents. The glass transition temperatures of the polymers determined by DSC thermograms were in the range 241–272°C. The temperatures at 10% weight loss from their TGA curves were found to be in the range 406–437°C in nitrogen. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008