Synthesis and characterization of novel thermally stable and optically active poly(amide‐imide)s derived from N,N′‐(4,4′‐diphthaloyl)‐bis‐L‐leucine diacid and aromatic diamines

Citations Over TimeTop 14% of 2007 papers

Abstract

Abstract A new diacid containing optically active functional groups, N,N′ ‐(4,4′‐diphthaloyl)‐bis‐ L ‐leucine diacid ( 3 ), was synthesized and used in a preparation of a series of poly(amide‐imide)s (PAIs) by direct polycondensation with various aromatic diamines in N ‐methyl‐2‐pyrrolidinone (NMP). All polymers derived from diacid ( 3 ) were highly organosoluble in the solvents like N ‐methyl‐2‐pyrrolidinone, N,N‐ dimethylacetamide, N,N‐ dimethylformamide, dimethyl sulfoxide, tetrahydrofuran, γ‐butyrolactone, cyclohexanone, and chloroform at room temperature or upon heating. Inherent viscosities of the PAIs were found to range between 0.34 and 0.61·dL g − 1 . All the PAIs afforded flexible and tough films. The glass‐transition temperatures of these PAIs were recorded between 212 and 237°C by differential scanning calorimetry, and the 10% weight loss temperatures were ranging from 372 to 393°C and 336–372°C under nitrogen and air, respectively. The polyimide films had a tensile strength in the range of 63–88 MPa and a tensile modulus in the range of 1.2–1.7 GPa. Optically active PAIs exhibited specific rotations in the range of −10.58° to −38.70°. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007

Related Papers

• → Synthesis of Sequential Polyamide by Direct Polycondensation(1991)39 cited
• → Aromatic polyamides with imide pendent groups(1983)31 cited
• → Preparation and properties of new polyamides from 1,6-diaminodiamantane and aromatic diacid chlorides(1995)5 cited
• → Synthesis and Properties of Polyamides, Polyimides, and a Polyamide-Imide Based On Trimethylene Glycol-Di-P-Aminobenzoate(1990)1 cited
• → Synthesis of Polyamide by the Room-Temperature Polycondensation of α-Amino Acid Derivatives(1967)2 cited