Synthesis and properties of new poly(amide-imide)s based on 1,3-bis[4,4'-(trimellitimido) phenoxy] propane and aromatic diamines

✍ Scribed by Hossein Nasr Isfahani; Khalil Faghihi; Nasim Valikhani

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 491 KB
• Volume: 117
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.30674

✦ Synopsis

Abstract

Six new poly(amide‐imide)s 8a–f containing trimethylene moiety in the main chain were synthesized by the polycondensation reactions of 1,3‐bis[4,4'‐(trimellitimido) phenoxy] propane 6 with six different aromatic diamines 7a–f in a medium constituting N‐methyl‐2‐pyrrolidone, triphenylphosphite, CaCl~2~, and pyridine as condensing agents. The polycondensation reaction produced a series of novel poly(amide‐imide)s 8a–f in high yields with inherent viscosities between 0.35 and 0.63 dL/g. The resulting poly(amide‐imide)s were characterized by elemental analysis, viscosity measurements, thermal gravimetric analysis (TGA and DTG), solubility tests, and FTIR spectroscopy. 1,3‐Bis[4,4'‐(trimellitimido) phenoxy] propane 6as a new monomer containing trimethylene moiety was synthesized using a three‐step reaction. At first 1,3‐bis[4,4'‐nitrophenoxy] propane 3was prepared by the reaction of 4‐nitrophenol 1 with 1,3‐dibromo propane 2in DMF solution**.** Then, dinitro 3 was reduced to 1,3‐bis[4,4'‐aminophenoxy] propane 4by using a solution of sodium sulfite in ethanol. Finally, 1,3‐bis[4,4'‐(trimellitimido) phenoxy] propane 6 was prepared by the reaction of one equivalent diamine 4with two equivalents of trimellitic anhydride 5in a mixture of acetic acid‐pyridine (3 : 2). © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010