Aromatic polyisophthalamides with iminobenzoyl pendant groups

✍ Scribed by J.G. de la Campa; E. Guijarro; F.J. Serna; J. de Abajo

• Book ID: 103072142
• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 464 KB
• Volume: 21
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(85)90206-x

✦ Synopsis

Polyisophthalamides were prepared from aromatic diamines and 5-iminobenzoylisophthalic acid by the Yamazaki method of direct polyamidation catalyzed by triphenylphosphite. The properties of the polymers were measured and compared with the analogous unsubstituted polyisophthalamides. The incorporation of one iminobenzoyl pendant group per repeating unit gave rise to better solubility in strongly polar solvents. Higher content of amide groups per repeating unit allowed the modified polymers to absorb moisture to a greater extent than the parent polyisophthalamides. The glass transition temperatures were raised 20-30 ~ by the presence of the pendant groups and they ranged from 290 to 317. On the contrary, the substituted polymers showed lower initial decomposition temperatures, as measured by TGA, all of them beginning to decompose at about 410 c. The mechanical properties of polymer films seemed not to be greatly affected by the pendant groups and only small differences were observed between substituted and unsubstituted polymers.