High-performance polyimides based on pyridine and xanthene pendant groups; synthesis, characterization, photoactivity, thermal, antibacterial, and Cr(VI) ion adsorption properties

Abstract

A group of new polyimides (PIs) containing xanthene bulky groups and heterocyclic pyridine ring were synthesized by polycondensation reaction by using new symmetric and asymmetric diamines with available dianhydrides. The prepared diamines and PIs were characterized by Fourier transform infrared, elemental analysis, and proton nuclear magnetic resonance spectroscopy and carbon nuclear magnetic resonance spectroscopy. The PIs have desirable solubility in common aprotic solvents like dimethyl sulfoxide, N-methyl-2-pyrrolidone, dimethylacetamide, and pyridine as a less polar solvent. The PIs with inherent viscosities in the range of 0.51–0.72 dL/g were amorphous in nature, showed glass transition temperatures ( Tgs) of about 270–300°C, and 10% weight loss at temperatures 384–443°C. They showed fluorescence emission (quantum yield 7–12%) due to the presence of xanthene and pyridine groups in their structure. The prepared PIs showed tensile strength of 81–91 MPa with elongation at break of 19–23%. The antibacterial properties of the PIs against Gram negative and Gram positive bacteria and funguses were investigated. Also, a membrane of PI prepared by electrospinning method was used for the removal of different concentrations of Cr(VI) from aqueous solutions.

Investigation of thermal, antibacterial and heavy metal ion removal behavior of polyamide/polyimide iron oxide nanocomposites

“…The obtained nanocomposites showed better removal behavior of metal ions compared to previous research. 15 (Table 3).…”

“…Furthermore, more recent attention has been given to finding new antibiotics or chemical compounds with good antimicrobial activity; carbazole, pyridine, and their derivatives are the most important of these chemical compounds. 14,15 These heterocyclic compounds, due to polarity, aroma, and symmetry, easily combine with aromatic PAs and PIs polymers and increase their solubility. 16,17 Moreover, carbazole and its derivatives have biological activities such as anticancer, antimicrobial, antiviral, and anti-inflammatory use in the polymer structure.…”

Bipyridine containing poly(amic-acid)s: Synthesis, characterization, and sorption behavior toward the Ni (II) ions

“…Heavy metals, including lead, copper, mercury, chromium, and nickel, generally are introduced in aquatic systems through the waste release from several industrial processes, leading to damages to ecosystems and human health. 4,5…”

Design and fabrication of photoactive imidazole-based poly(ether-imide)s and a polyimide/HBP-modified SiO2 composite: toward high heat-resistance, antimicrobial activity and removal of heavy metal ions

“…These groups prevent from packing of the polymer chains and CTC formation as a result solubility in common solvent improves dramatically. 24,25 Other methods that have been developed in this eld include introducing electron-donating moieties, 26 heterocyclic segments, 27 aliphatic moiety, 28 exible linkages, 29 and spiro structure into the polyimide chains. 30,31 Ring components containing heteroatoms have been extensively incorporated into the backbone of thermostable polymers such as polyisocyanurate, polyureas, polyesters, polyimides, and polyamides, which progress the solubility of these polymers in organic solvents and enhance their chemical plus thermal resistance.…”