Synthesis and properties of para-linked aromatic polycondensates containing 3,3′,4,4′-biphenyltetracarboxylic-N,N′-bis(4-amino-biphenyl) diimide units
✍ Scribed by Gerold Schmitt; Petra Eiselt; Reiner Giesa; Hans-Werner Schmidt
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 120 KB
- Volume
- 200
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Two new diamino monomers based on 3,39,4,49-biphenyltetracarboxylic dianhydride (BPDA) were synthesized and used in a low temperature polyamide polycondensation. High molecular weight homopoly(amide-imide)s and copoly(amide-imide)s were synthesized via in-situ silylation and investigated with respect to their solution, thermal, and film forming properties. All polymers are soluble in strong acids and most in amide type solvents. Inherent viscosities up to 7.4 dl/g in N-methyl-2-pyrrolidone (NMP)/LiCl were achieved. A methyl substitution in ortho-position to the imide group resulted in polymers possessing improved solubility and good thermal stability up to 500 8C. Isotropic films can be prepared from solution.