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

Abstract

A new diacid containing optically active functional groups, N,N 0 -(4,4 0 -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, g-butyrolactone, cyclohexanone, and chloroform at room temperature or upon heating. Inherent viscosities of the PAIs were found to range between 0.34 and 0.61ÁdL g À1 . All the PAIs afforded flexible and tough films. The glass-transition temperatures of these PAIs were recorded between 212 and 2378C by differential scanning calorimetry, and the 10% weight loss temperatures were ranging from 372 to 3938C and 336-3728C 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 À10.588 to À38.708.

New photosensitive poly(amid‐imide)s containing chalcone moiety and hydantoin derivatives in the main chain: Synthesis and characterization

“…[3][4][5][6][7][8][9] In addition, various copolyimides such as poly(amideimide)s have been proposed in many reports. [10][11][12] There is a growing interest in poly(amide-imide)s (PAIs) for a variety of applications as they retain good mechanical properties at high temperatures and show easier processability in comparison with other aromatic thermostable polymers such as polyamides and polyimides. They are finding numerous applications in adhesives, electronic wire enamel, injection-molding, extrusion products, and membranes.…”

Synthesis and characterization of new optically active and organosoluble poly(ester-imide)s based on bicyclo[2,2,2]oct-7-ene-2,3,5,6-tetracarboxylic diimide by direct polycondensation

“…However, these polymers are generally intractable and lack the properties essential for successful fabrication into useful forms because of their high melting or glass-transition temperatures and limited solubility in organic solvents [3]. One of the successful approaches to improving solubility is the incorporation of other functional groups, such as amide, ether, ester and siloxane linkages, along the polymer skeleton and, consequently, the preparation of the appropriate copolyimides [4][5][6][7][8][9][10][11][12].…”

Synthesis and characterization of optically active and organosoluble poly(amide-imide)s containing imidazole rings as pendent groups by direct polycondensation

“…Also polymers with optically active properties have been found interesting applications, such as chiral phase for enantiomeric separations in chromatography methods or chiral media for asymmetric synthesis [20][21][22][23][24].…”