Preparation and properties of aromatic copolyamides from aromatic diisocyanates and aromatic dicarboxylic acids
โ Scribed by Toshihiro Otsuki; Masa-Aki Kakimoto; Yoshio Imai
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 318 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0887-624X
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๐ SIMILAR VOLUMES
## Abstract New aromatic polyamides (aramids) having inherent viscosities of 0.5โ2.6 dL/g were prepared by the direct polycondensation of 4,4โฒโdiaminotriphenylamine with various aromatic dicarboxylic acids in __N__โmethylโ2โpyrrolidone using triphenyl phosphite and pyridine as condensing agents. Th
New biphenyl-2,2ะ-diyl-containing aromatic polyamides having a crank and twisted noncoplannar structure were synthesized in inherent viscosities of 0.39 -1.42 dL/g by the low-temperature solution polycondensation of 2,2ะ-bis(4-aminophenyl)biphenyl, prepared in four steps starting from 2-aminobipheny
## Abstract Aromatic polyamides were prepared by an AlCl~3~ or HClโcatalyzed polymerization of toluene diisocyanate or methylenebis(phenyl isocyanate) with adipic acid at low temperatures (โค100ยฐC) in a short reaction time (3โ4 h). The intrinsic viscosity of the polymers was approximately 1.1 dL/g a