Propylene polymerization by using TiCl₄ catalyst supported on solvent‐activated Mg(OEt)₂

Abstract

Solvent activation of Mg(OEt) 2 in ethanol with carbon dioxide was carried out in a 1-L three-neck flask under nitrogen atmosphere, to investigate structural changes of Mg(OEt) 2 support. During activation of Mg(OEt) 2 by ethanol and CO 2 , a suspension mixture was converted to a clear solution and CO 2 was inserted into the MgOO bond of Mg(OEt) 2 , to form magnesium ethyl carbonate. The solid supports were obtained from the removal of solvents by heating, during which CO 2 split off from the magnesium ethyl carbonate between 100 and 150°C. The structural changes of the obtained supports and the corresponding catalysts were checked by IR and TGA. The polymerization behavior of propylene with the catalyst and morphology of the obtained polymer were also examined.

Polyamine-Modified Magnetic Graphene Oxide Nanocomposites and HPLC-MS/MS Allow the Determination of Two Indolic Derivatives in Strong-Aroma Types of Base Baijiu

“…The proper activation of nanoparticles after preparation is very important. Such a process can not only remove unreacted starting material but also improve the sorbent structure, 36 which would eventually enhance the extraction efficiency of the target analytes by the aforementioned sorbents. For instance, Zornitta et al 37 demonstrated that carbonization at 850 °C and KOH activation provided polyaniline with a remarkable pore volume (2.30 cm 3 / g) and specific surface area (∼3600 m 2 /g), leading to a direct enhancement of its electrosorption performance (involving a higher electrode capacitance (213 F/g), SAC (22.2 mg/g), and charge efficiency (81%)).…”