Ibrahim Karatas

Side-chain functionalization of polystyrene with maleic anhydride in the presence of lewis acids

Polystyrenes with different molecular weights were chemically modified with maleic anhydride by use of certain cationic catalysts of Lewis acid type (BF3·OEt2, AICI3, TiCL4, ZnCl2, FeCl3, and SnCl4) in chloroform. The effects of molecular weight of polystyrene, as well as type of Lewis acid used, on properties and structure of products were investigated. The interrelation between the molecular weight of polystyrene and content of carboxyl groups in the products was made. A direct relationship between the activity of catalyst used and the number of carboxyl groups was found. For characterization of side-chain functionalized polystyrene, fractional precipitation was applied which yielded carboxyl groups in all fractions. The carboxyl group concentrations were found to be the highest in the case of BF3·OEt2. Modified polystyrene samples containing COCHCHCOOH fragments in side chains are easily crosslinked at 140–150°C and by UV irradiation as proved by IR, DTA, and TGA analyses. Functionalized polymers obtained are characterized by their high thermostability, adhesion, and photosensitivity.

Binuclear and mononuclear cobalt(II), nickel(II) and copper(II) complexes of 4,4′-bis(alkylaminoisonitrosoacetyl)diphenyl-methane derivatives

Abstract4,4′-Bis(chloroacetyl)diphenylmethane has been prepared from ClCH2COCl and Ph2CH2. 4,4′-Methylenebis(phenylglyoxylohydroximoyl chloride has also been obtained. Four new substituted 4,4′-bis(alkylaminoisonitrosoacetyl)diphenylmethanes (ligands) have been prepared from 4,4′-methylenebis(phenylglyoxylohydroximoyl chloride) and the corresponding amines. The NiII, CuII and CoII complexes of these ligands were prepared and their structures were identified using AAS, i.r., 1H-n.m.r. spectral data, elemental analyses and magnetic susceptibility measurements.

Functionalization of polystyrene and adhesion studies

The adhesion capability of novel functional polystyrenes to metals and their capability to provide corrosion resistance to metals under various conditions have been investigated. The polyfunctional polystyrenes were prepared via reaction of the polystyrene with different functional groups [2-methyl-2,3-epoxy-6-octene-4-one (I), 2-methyl-2,3-epoxy-5,7-nonadien-4-one (II), 1-chloro-2,3-epoxy-5-chloromethyl-5-hexene (III), I-(Δ3-tetrahydrobenzaldoxime)-2,3-epoxy propane (IV), and maleic anhydride (V)] in the presence of catalysts. The results show that the addition of functional groups to the polystyrene increases its adhesion capability and corrosion resistance. This increase is attributed to the quantity and nature of the functional groups bonded to polystyrene.

Effects of the functional groups of polystyrene on its adhesion improvement and corrosion resistance

Novel functionalized polystyrenes having groups such as epichlorohydrin, epoxy, acetyl, C=C double bond, and carboxyl were synthesized by the reaction of polystyrene with epichlorohydrin, unsaturated hydrocarbons, and organic anhydrides in the presence of Lewis acid catalysts. The adhesion capability and corrosion resistance of the new synthesized functionalized polystyrenes to metals under various conditions were investigated. A very good relationship was observed between the quantity of functional groups bonded to the aromatic rings of the polystyrenes and the adhesion and corrosion resistance properties of the polyfunctionalized polystyrenes. It was also observed that the new polyfunctionalized polystyrenes obtained by chemical modification with maleic anhydride, acetic anhydride, isoprene, butadiene, and epichlorohydrin in the presence of cationic catalysts resulted in high adhesion and anti-corrosion properties.

The Synthesis of Five New bis(Aminophenylglyoximes) and Their Polymeric Complexes with Cu(II), Ni(II) and Co(II)

Abstract In this study, five new bis (aminophenylglyoximes), 1,4-phenylenebis(aminophenylglyoxime), 1,1′-biphenyl-4,4′-bis(ami-nophenylglyoxime), 1,1′-diphenyloxy-4,4′-bis(aminophenylgly-oxime), 1,1′-diphenylmethylene-4,4′-bis(aminophenylglyoxime) and 1,1′-diphenylethylene-4,4′-bis(aminophenylglyoxime), have been synthesized from anti-chlorophenylglyoxime and the corresponding aromatic diamines. Their polymeric complexes with Cu(II), Ni(II) and Co(II) have been obtained. The Cu(II) and Ni(II) complexes of these ligands are square-planar while the Co(II) complexes are octahedral with water molecules as axial ligands. 1H-NMR, IR and elemental analyses data of the complexes and ligands are given.

Synthesis of Six New Substituted Aminomethylglyoximes and Some of Their Transition Metal Complexes

Abstract The following substituted amino and diaminomethylglyoximes have been synthesized: phenylaminomethylglyoxime, p-tolylaminomethylglyoxime, p-acetoxy-phenylaminomethylglyoxime, diphenyl-4,4′-bis(aminomethylglyoxime), l,l′-diphenyl-methane-4,4′-bis(aminomethylglyoxime) and 1,1′-diphenyloxy-4,4′-bis(aminomethyl-glyoxime) Their complexes with cobalt(II), nickel(II), copper(II) and palladium(II) have been isolated. The structure of these new compounds are proposed on the basis of elemental analyses, 1H-NMR and IR spectral data.

THE SYNTHESIS OF SUBSTITUTED BIS-(AMINOPHENYLGLYOXIME)METHANES AND THEIR POLYMERIC METAL COMPLEXES WITH Cu(II), Ni(II), AND Co(II) SALTS

In this study, 4,4′-bis(chloroacetyl)diphenylmethane (HL) has been synthesized from chloroacetylchloride and diphenylmethane. Subsequently, its keto oxime (H2L) and glyoxime (H4L) derivatives have been prepared. Then, seven new substituted bis(aminophenylglyoxime)methanes (H4Lx) have been synthesized from bis(chlorophenylglyoxime)methane and the corresponding amines. The Ni(II), Cu(II) and Co(II) complexes of these ligands were prepared. The structures of these ligands and their complexes were identifed by IR and 1H NMR spectral data, elemental analyses and magnetic measurements.

Synthesis and Properties of Poly(benzoxazole)s Prepared from Aromatic Dihydroxamoyl Chlorides

In this study, a new synthesis of polybenzoxazoles was studied by reacting 3,31-dihydroxy-4,41diaminobiphenyl with various p-aromatic dihydroxamoyl chlorides in N,N-dimethylformamide under a nitrogen atmosphere at both room temperature and 150 3C. The polymers were characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, liquid chromatography/mass spectrometry, thermogravimetric analysis and the elemental analysis. Direct current conductivity of HCl acid-doped polybenzimidazole pellets was measured by applying a constant voltage of 5 V. The results of this study are discussed herein.