Synthesis and characterization of new soluble polyamides based on 3,3′,5,5′-tetramethyl-2,2- bis[4-(4-aminophenoxy)phenyl]propane and various aromatic dicarboxylic acids

✍ Scribed by Der-Jang Liaw; Been-Yang Liaw

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 140 KB
• Volume: 36
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(199805)36:7<1075::aid-pola6>3.0.co;2-1

✦ Synopsis

A series of new soluble polyamides having isopropylidene-and methylsubstituted arylene ether moieties in the polymer chain were prepared by the direct polycondensation of 3,3 ,5,5-tetramethyl-2,2-bis[4-(4-aminophenoxy)phenyl]propane (TBAPP ) and various aromatic dicarboxylic acids in N-methyl-2-pyrrolidinone (NMP) using triphenyl phosphite and pyridine as condensing agents. Polymers were produced with high yield and moderate to high inherent viscosities of 0.87-1.56 dL g 01 . All the polymers could be readily dissolved in polar aprotic solvents such as NMP, N,Ndimethylacetamide and N,N-dimethylformamide, as well as less polar solvents such as m-cresol and pyridine. Some of them were even soluble in tetrahydrofuran. These polymers were solution-cast into transparent, flexible, tough films which were further characterized by x-ray and mechanical analysis. All of the polymers were amorphous and the polyamide films had a tensile strength range of 51-100 MPa, an elongation at break range of 4-11%, and a tensile modulus range of 1.90-2.53 GPa. These polyamides had glass transition temperatures between 188-255ЊC and 10% mass loss temperatures in the range of 439-468 and 454-483ЊC in nitrogen and air atmosphere, respectively.