Abstract Due to the important role of cocatalyst in polymerization process employing industrially favored Ziegler–Natta catalysts, its effect on kinetic behavior, catalyst activity, and polymer properties is discussed. In this paper, triethyl aluminum (TEA) triisobutyl (TIBA) have been used as main ingredient with 10–20 mol percent diethyl chloride (DEAC) ethyl dichloride (EADC) cocatalysts, be...

Despite decades of extensive studies, the atomic-scale structure active sites in heterogeneous Ziegler–Natta (ZN) catalysts, one most important processes chemical industry, remains elusive and a matter debate. In present work, ZN catalysts absence ethylene, referred to as dormant sites, is elucidated from magnetic resonance experiments carried out on samples reacted with increasing amounts BCl3...

The use of UHMWPE has attracted the attention of many researchers and industries. The aim of the present work is to fabricate UHMWPE/MoS2-Oxide nano-composites using in-situ polymerization. For this purpose, modified molybdenum disulfide was used. In order to perform the polymerization, a Ziegler-Natta catalytic system, with MoS2-Oxide and magnesium Ethoxide as support, was used. In order to fa...

Ethylene / 1-butene copolymers at different comonomer levels were synthesized using Ziegler-Natta catalyst to evaluate the applicability of thermal fractionation methods in predicting chemical composition distribution (CCD). The continuous melting endotherms by DSC were converted to continuous CCD, and the average comonomer contents were compared with NMR results. DSC underestimated comonomer c...

Ž .y wŽ . Ž .q Ž . Displacement of the anion H C–B C F from the zirconocene contact-ion pair C H Zr CH PPP m-H C – 3 6 5 3 5 5 2 3 3 Ž .yx B C F by a series of phosphines and formation of a bisphosphine complex by uptake of a second phosphine ligand have 6 5 3 been studied by NMR methods in C D solutions. Evidence is presented that associated, outer-sphere ion pairs 6 6 wŽ . Ž .Ž .xq Ž .y C H Z...

Vanadium-modified (SiO2/MgO/MgCl2)•TiClx Ziegler-Natta catalysts were prepared through co-impregnation of water-soluble magnesium and vanadium salts under different pH values. Several key factors such as pH value of co-impregnation solution during catalyst preparation, catalyst performances including catalytic activity, ethylene/1-hexene copolymerization and hydrogen response were investigated....