Synthesis and Characterization of Chiral Poly(Amide-Imide) Containing L-Alanine
A novel chiral poly(amide imide) containing L-alanine was synthesized by direct polycondensation reaction of newly synthesized N,N’-(4,4’-diphthaloyl)-bis-L-alanine diacid with 4,4’-diaminodiphenyl ether in a medium consisting of N-methyl-2-pyrrolidone (NMP), triphenylphosphite (TPP), calcium chloride (CaCl2), and pyridine. The new chiral diimide-diacid monomer was synthesized by direct reaction of 3,3’-4,4’-Biphenyl tetracarboxylic acid dianhydride with L-alanine in acetic acid under reﬂuxing conditions. The resulting compounds were obtained in quantitative yields and high purity. The synthetic diacid monomer was characterized by elemental analysis, 1H-NMR spectroscopy, FT-IR techniques and speciﬁc rotation, the obtained polymer was characterized by FTIR techniques, speciﬁc rotation and solubility testing.
Helen Zhang and David Jin
Z. Y. Yang et al., "Synthesis and Characterization of Chiral Poly(Amide-Imide) Containing L-Alanine", Advanced Materials Research, Vols. 282-283, pp. 116-119, 2011