A series of organo-soluble and thermally stable polyimides with N-benzonitrile side group were synthesized from a new diamine monomer, 3-(bis(4-aminophenyl)amino)benzonitrile with different aromatic dianhydrides via thermal or chemical imidization.
Nanocomposites of polyimide with silane end group and ZnO nanoparticles with good thermal and mechanical properties were prepared and were used for gas separation.
This study reports a green approach toward the synthesis of novel optically active poly(amide-imide)s (PAI)s bearing thiazole moiety, which was formed by the polycondensation reaction of 3,5-diamino-N-(thiazol-2-yl)benzamide and various diacids containing natural amino acids in molten tetrabutylammonium bromide. Diamine monomer was synthesized by the reduction of 3,5-dinitro-N-(thiazol-2-yl)benzamide in methanol using iron oxide hydroxide as a catalyst. This catalyst can rapidly reduce the sulfur and azo-containing aromatic nitro compounds to the corresponding amines in high yield by employing hydrazine hydrate as a hydrogen donor. Chiral diacid monomers were synthesized in high yield through the reaction of pyromellitic dianhydride and amino acids (L-isoluecine, S-valine, S-methionine, and L-phenylalanine) in acetic acid. The direct polymerization reactions of these monomers provided a series of new optically active PAIs with inherent viscosities in the range of 0.20-0.28 dL g À1 . The obtained polymers were characterized by Fouriertransformed infrared spectroscopy, specific rotation measurements, and the representative of them by proton nuclear magnetic resonance and elemental analysis techniques.
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