Novel thermally stable and chiral poly(amide-imide)s bearing from N,N '-(4,4 '-diphthaloyl)-bis-L-isoleucine diacid: Synthesis and characterization

作者：Liaw Der Jang^*; Chang Feng Chyuan; Liu Jui Hsiang; Wang Kun Li; Faghihi Khalil; Huang Shu Hsien; Lee Kueir Rarn; Lai Juin Yih

来源：Polymer Degradation and Stability, 2007, 92(2): 323-329.

DOI：10.1016/j.polymdegradstab.2006.10.005

• poly(amide-imide)s (PAIs)
• L-isoleucine
• chiral
• specific rotation

Novel optically active aromatic poly(amide-imide)s (PAIs) were prepared from newly synthesized N,N'-(4,4'-diphthaloyl)-biS-L-isoleucine diacid (3) via polycondensation with various diamines. The diacid was synthesized by the condensation reaction of 3,3',4,4'-biphenyltetracarboxylic dianhydride (1) with L-isoleucine (2) in a mixture of acetic acid and pyridine (3:2 v/v). All the polymers were obtained in quantitative yields with inherent viscosities of 0.20-0.43 dL g(-1). All the polymers were highly organosoluble in solvents like N-methyl-2-pyrrolidinone (NMP), N,N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO). tetrahydrofuran, gamma-butyrolactone., cyclohexanone and chloroform at room temperature or upon heating. These poly(arnide-imide)s had glass transition temperatures between 198 and 231 degrees C, and their 10% weight-loss temperatures were ranging from 368 to 398 degrees C and 353 to 375 degrees C under nitrogen and air, respectively. The polyimide films had tensile strengths in the range of 63-88 MPa and tensile moduli in the range of 0.8-1.4 GPa. These poly(amide-imide)s possessed chiral properties and the specific rotations were in the range of -3.10 degrees to -72.92 degrees.

• 出版日期2007-2