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

Abstract

Six new poly(amid-imide)s containing chalchone and hydantoin moieties in the main chain were synthesized through the polycondensation reaction of 1,3-bis[4,4 0 -bis(trimellityimido)phenyl]-2-propenone 6 with six hydantoin derivatives 7a-f in a medium consisting of triphenyl phosphite, calcium chloride, pyridine, and N-methyl-2-pyrrolidone. The polycondensation reaction produced a series of novel poly(amid-imide)s 8a-f in high yields with inherent viscosities between 0.26 and 0.42 dL/g. The resulting polymers were characterized by elemental analysis, viscosity measurements, solubility test, thermo gravimetric analysis (TGA and DTG), FTIR, and UV-Vis spectroscopy. 1,3-bis[4,4 0 -bis(trimellityimido)phenyl]-2-propenone 6 was prepared from a three-step reaction by using 4-nitro benzaldehyde 1 and 4-nitro acetophenone 2 as precursors.

Preparationof self‐emulsifying waterborne polyamide‐imide sizing for carbon fiber and improvement on mechanical performances of carbon fiber reinforced thermoplastic polymer

“…That semi‐aromatic structural could reduce the rigidity was well‐known. [ 30 ] Second, the introduction of chiral carbon atoms in L‐Cys, and flexible and rotatable ether linkages in BAPP broke the regularity of backbone, [ 31 ] an asymmetric and non‐coplanar configuration was obtained; Moreover, the aliphatic side chain from EOEOEA provided the steric hindrance of intermolecular interactions, increasing the free volume between molecules. [ 32 ] Benefiting from the structure design, the content of organic solvents in sizing was markedly reduced and the flexible backbones of the amorphous PAI‐OA provide potential excellent processability for sized CF.…”