A Cationic Polymerization ofN-Phenylethylenimine by Various Carboxylic Acid Catalysts

Phillips catalysts synthesized over various silica supports: Characterization and their catalytic evaluation in ethylene polymerization

Ethylene polymerization was carried out using Phillips chromium catalyst based on silica supports such as silica aerogel, SiO2 (Grace 643), and titanium modified SiO2 (G 643), and the results were compared with other catalysts based on SiO2 (Aldrich), SBA-15(Hex), SBA-15(Sp) and MCM-41. A combination of TGA, DSC, XRD, nitrogen adsorption, SEM, ICP, FTIR and other analyses were used to character...

Direct Synthesis of Branched Carboxylic Acid Functionalized Poly(1-octene) by -Diimine Palladium Catalysts

In this work, we studied propylene polymerization using some α-diimine palladium catalysts with systematically varied ligand sterics. In propylene polymerization, the ligand steric effect exhibits significant variations on the catalytic activity, polymer molecular weight, and branching density. However, the regio control for the polymer microstructure is poor. Furthermore, copolymerization of 1...

Amine catalyzed solvent C-H bond activation as deactivation route for cationic decamethylzirconocene olefin polymerization catalysts.

The C-D activation of bromobenzene-d(5) by [Cp*(2)ZrMe(BrC(6)D(5)-kappaBr)][B(C(6)F(5))(4)] to form sigma-aryl complex [Cp*(2)Zr(2-BrC(6)D(4)-kappa(2)Br,C)][B(C(6)F(5))(4)] is accelerated when the decamethylzirconocene methyl cation is generated in the presence of tertiary amines. Computational studies suggest that the overall sigma-bond metathesis reaction proceeds, in the presence of tertiary...

The specific volume of various cationic forms of deoxyribonucleic acid.

Nanoparticle-Supported Molecular Polymerization Catalysts

Homogeneous molecular catalysts are immobilzed in a well-defined fashion on individual silica nanoparticles with a narrow particle size distribution by covalent attachment. This synthetic methodology is demonstrated with modified salicylaldiminato-substituted titanium(IV) complexes incorporating a trimethoxysilaneterminated linker: dichloro-bis[κ2-N,O-6-(3-(trimethoxysilyl)propoxyphenylimino)-2...