Cincinnati, OH, United States
Cincinnati, OH, United States

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Jones Jr. R.L.,DSM PTG | Armoush M.Z.,DSM PTG | Harjati T.,DSM PTG | Elder M.,Davison Catalysts | And 2 more authors.
Inorganica Chimica Acta | Year: 2010

Classic inorganic and more recent organometallic compounds capable of polymerizing ethylene to ultra high molecular are compared. Activated catalysts showed varying degrees of productivity when challenged with co-monomers. The general activity trend followed TiCl 3 < Mg/Si-TiCl 3 < metallocenes. A new phenoxyimine catalyst complex N-(3,5- diiodosalicylidene)cycloheptylamine titanium dichloride was useful in making UHMWPE and compared to previously reported phenoxyimine catalyst structures capable of living polyolefin polymerizations. © 2010 Elsevier B.V. All rights reserved.

Taylor S.D.,University of Cincinnati | Taylor S.D.,Shepherd Chemical Company | Norton A.E.,University of Cincinnati | Hart R.T.,Shepherd Chemical Company | And 3 more authors.
Chemical Communications | Year: 2013

[Pt(tpy)Cl]ClO4·H2O (1·H2O) changes from red to yellow upon dehydration due to increased Pt⋯Pt distances. Spectroscopic, diffraction, gravimetric and calorimetric data demonstrate the presence of intermediates during hydration and dehydration which signifies surprising mechanistic complexity in the vapochromic response. © 2013 The Royal Society of Chemistry.

Hart R.T.,Shepherd Chemical Company | Kerr A.A.,Shepherd Chemical Company | Eckert N.A.,Shepherd Chemical Company
Tribology Transactions | Year: 2010

A series of bismuth carboxylates were tested with active and inactive sulfur compounds as extreme pressure (EP) lubricant additives. Wear and load measurements from four-ball tests are reported. Bismuth 2-ethylhexanoate (Bi 2EH), bismuth neodecanoate (Bi NDA) and bismuth naphthenate (Bi Nap) showed excellent EP activity with both active and inactive sulfur compounds (≥620 kg four-ball weld load). The mechanism of the EP lubricity was studied using thermogravimetric analysis (TGA), high-temperature X-ray diffraction (HTXRD), and scanning electron microscopy with energy-dispersive Xray spectroscopy (SEM-EDS). The results of these studies support the formation of bismuth sulfide during thermolysis of the bismuth carboxylate-polysulfide mixtures. The structure of bismuth sulfide suggests that interlayer shear occurs and provides lubricity.

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