Synthesis and characterization of new poly(amide-imide)s based on 1,4-bis(trimellitimido)-2,5-dichlorobenzene

✍ Scribed by Chin-Ping Yang; Guey-Sheng Liou; Shyh-Yau Chang; Shin-Haur Chen

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 141 KB
• Volume: 73
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19990711)73:2<271::aid-app13>3.0.co;2-6

✦ Synopsis

A series of new aromatic poly(amide-imide)s were synthesized by the triphenyl phosphite-activated polycondensation of the diimide-diacid, 1,4-bis(trimellitimido)-2,5-dichlorobenzene (I), with various aromatic diamines in a medium consisting of N-methyl-2-pyrrolidone (NMP), pyridine, and calcium chloride. The poly(amideimide)s had inherent viscosities of 0.88 -1.27 dL g Ϫ1 . The diimide-diacid monomer (I) was prepared from 2,5-dichloro-p-phenylenediamine with trimellitic anhydride. All the resulting polymers were amorphous and were readily soluble in a variety of organic solvents, including NMP and N,N-dimethylacetamide. Transparent, flexible, and tough films of these polymers could be cast from N,N-dimethylacetamide or NMP solutions. Cast films had tensile strengths ranging from 92 to 127 MPa, elongations at break from 4 to 24%, and initial moduli from 2.59 to 3.65 GPa. The glass transition temperatures of these polymers were in the range of 256°-317°C, and the 10% weight loss temperatures were above 430°C in nitrogen.