Synthesis and Characterization of Linear Thermally Stable polyester contain Schiff Bases

Abstract

A COPOLYMERS are important compounds today because of their wide applications in various industrial and medical fields and in other fields. Therefore, the study of preparing many of these polymers has been studied. This research involved preparing linear polyester contain Schiff-base unit by interfacial polycondensation three type diacid chloride (Succinoyl Chloride, Adipoyl Chloride and sebacoyl Chloride) in a chloroform /water system employing phase transfer catalyst with monomer containing two hydroxyl which is derived from a 4-hydroxy aniline reacted with a 4-hydroxy benzaldehyde monomer. The monomer (EM1) and polyester (EM2, EM3, and EM4) were characterized by FTIR, 1 H NMR, 13 C NMR and TGA analysis. The polyester-Schiff base so obtained show good thermal stability.

Preparation of New Complexes of Fe(II), Co(II), Ni(II) and Cu(II) with Mixed Ligands of Ciprofloxacin or Levofloxacin with Eugenol and Study of Their Chemical and Physical Properties

“…3.1. IR spectra of complexes: ciprofloxacin ligand spectrum shoes three bands at 1120, 1114 and 1160 cm -1 which may be assigned to three C-O group respectively [15].…”

Deep eutectic solvents (Reline) and Gold Nanoparticles Supported on Titanium Oxide (Au–TiO2) as New Catalysts for synthesis some substituted phenyl(substituted-3-phenyloxiran)methanone Enantioselective Peroxidation

“…OF DEEP EUTECTIC SOLVENTS (RELINE): [30] A glass rode was used to mix choline chloride (0.1 mole) and urea (0.2 mole) in a test tube by heating at 100-120 °C until a clear solution began to form. Then, the product was cooled and used without any purification.…”

“…The most recently catalysts used for peroxidation of the organic substrates were transition metal salts such as titanium, vanadium, nickel, platinum, and palladium. The catalytic effects were due to their electronic configurations, which helped them to exchange their partially filled d-orbitals electrons with the reacting species [30].…”

A practical and theoretical study of the mechanical kinetics of ascorbic acid adsorption on a new clay surface

“…Several factors are affecting on adsorption process such as contact time, temperature, solvent, acidity function, etc., all these factors were studied also. Several theoretical studies have given an accurate description of the dissociation of amino acids in the acidic medium, and their results were very accurate compared with the practical results [12] also the mechanism of reactions has been proposed based on the oxidation kinetics of some organic compounds [13][14]. Adsorption reactions often depend on the pigment present, which the clays remove [15].…”

“…The water molecules adsorbed on the surface of clay in this step of adsorption, because the surface of clay carries negative charges on oxygen atoms which belonged to the presence of metal oxide in it, this step is useful to activation the metal oxides surface to help the acidic anions which carry negative charge to be adsorbed on the surface of clay after that this step represents the second step of adsorption. The transition of anions and numbers of (H + ) ions leads to an increase in dissociation of ascorbic acid molecules and that will cause increasing of free ions because the interaction and interference between ions and water molecules decrease by adsorption of (H + ) ions and anions on the surface of clay for these reasons the conductivity increases after adsorption by free adsorbate ions which stay in solution, see table(13) which are showing the changing of (pH) and electrical conductivity after adsorption at different concentrations[23][24].The increasing temperature will ease the dissociation of ascorbic acid by increasing of (H + ) ions in the solution. This leads to a decrease in acidity function and an increase in the electrical conductivity of the acidic solution.…”