Disclosed are novel aromatic compounds which are useful for treating diseases or pathological conditions involving inflammation such as chronic inflammatory diseases. Also disclosed are pharmaceutical compositions containing and processes of making such compounds.

Compounds useful as anti-inflammatory agents

Morphology and size control of inorganic particles in polyimide hybrids by using SiO2–TiO2 mixed oxide

Mechanism of bifunctional p-amino benzenesulfonic acid modified interface in perovskite solar cells

A novel class of interesting polyurea derivatives 6a-c and 7a-c was synthesized using solution polycondensation technique by the interaction of 1 mole of bis (2-aminothiazol-4-ylbenzylidene)cycloalkanones monomers 3a,b with one moles of diisocyanate compounds in pyridine. The model compounds 4 and 5 were synthesized by the interaction of one mole of monomers 3a or 3b with two moles of phenylisocyanate in pyridine and their structures were confirmed by correct elemental and spectral analyses. The resulting polymers were characterized by elemental and spectral analyses, beside solubility and viscometry measurements. X-ray analysis showed these polymers having high degree of crystallinity in the region 2θ = 5–60°. In addition, the morphological properties of selected examples were tested by SEM, and the electrical properties of these polymers were measured. Moreover the corrosion inhibition behavior of diarylidenecycloalkanone monomers and selected examples of polyurea derivatives were carried out on steel in 0.5 M H2SO4 at 40°C giving cathodic, anodic and mixed inhibition.

New polymer syntheses, part 45: Corrosion inhibition behavior of novel polyurea derivatives based on diarylidenecycloalkanone moieties in the polymers backbone

Thermally stable metal-containing polyureas from hexadentate Schiff base metal complexes and diisocyanates ☆

Metal-containing polyureas containing ionic linkages in the main chain can be obtained by the polyaddition reactions of 2,4-tolylene diisocyanate with mixtures of divalent metal salts of sulfanilic acid (p-aniline sulfonic acid [ASA] ) and 4,4′-diaminodiphenylmethane. Ba, Zn, Pb, and Sr were used as divalent metals, and their structures were characterized by 1H-NMR, 13C-NMR, and IR. The polyureas were obtained with ASA(M) up to 100% in feed diamines and they were all soluble in DMF and DMSO. The inherent viscosity of the polyureas decreased markedly with an increase in metal content. The thermal properties of these polyureas were also investigated by DSC and TG. It was found that introducing the metal into the polyurea increased the thermal stability. © 1993 John Wiley & Sons, Inc.

Preparation and characterization of polyureas from divalent metal (Ba, Sr, Pb, Zn) salts of sulfanilic acid

The bismaleimides chain-extended by ureylene linkages were obtained by the reaction of a diamine with maleic anhydride (1 : 1 molar ratio) first and then by the reaction of the resulting solution with a diisocyanate, followed by the cyclodehydration of the diamic acid The bismaleimides were characterized by elemental analysis, IR, 1 H-NMR, and 13 C-NMR The results of thermal analysis show that the solidification reaction takes place above 200°C for most bismaleimides and the crosslinking products decompose at higher temperatures

Preparation and characterization of bismaleimides chain‐extended by ureylene linkages

Some 50 metal-containing polyimides with the metallic elements (Mg, Ca, Sr, Ba, Pb, Co, Ni) in the main chain were prepared first by reacting pyromellitic dianhydride (PMDA) with the mixture of divalent metal salts of p-aminobenzoic acid [ABA(M)] and 4, 4'-diaminodiphenylmethane (MDA) to form polyamic acid salts, and then the desired polyimides were obtained in high yield by separating the polyamic acid salts from the solvent and heating them under the imidization conditions. The structures of the samples were characterized by 1H-NMR and IR, and the thermal properties of polyimides were measured by TG-DTA. It was found that the thermooxidative stability of polyimides decreased as a small amount of a metal element was introduced, and the stability of polymer varied slightly or tends to constancy as the metal content increased to a certain degree. In addition, the inherent viscosity of the polyamic acid salt solutions also decreased markedly with the increase of the metal content. © 1996 John Wiley & Sons, Inc.

Synthesis and characterization of polyimides from divalent metal salts of p‐aminobenzoic acid

A study of the thermal stability of metal bismaleimides and the thermal cyclodehydration of their precursors

A series of novel metal-containing bismaleimides monomers BMI(M) (M = Ca, Sr, Ba, Pb, Co, Ni ) were prepared by reacting maleic anhydride with diaminodiphenyl carboxylate to form bismaleamic acid precursors, and subsequently by imidizing them chemically or thermally to form bismaleimides. The samples were characterized by IR, 3 H-NMR, and TG-DTA. The results of thermal analysis show that the BMI(M) have high thermo-oxidiative stability and their temperatures of initial decomposition have a relationship with metals introduced and the imidization methods.

Wulin Qiu

Papers

Preparation and characterization of polyureas from divalent metal (Ba, Sr, Pb, Zn) salts of sulfanilic acid

Preparation and characterization of bismaleimides chain‐extended by ureylene linkages

Synthesis and characterization of polyimides from divalent metal salts of p‐aminobenzoic acid

A study of the thermal stability of metal bismaleimides and the thermal cyclodehydration of their precursors

Preparation and characterization of metal‐containing bismaleimides from divalent metal salts of p‐aminobenzoic acid