TY - JOUR
AU - Gupta, Virendrakumar
AB - The impact of aluminum trialkyl (AlR3) and esters/silane-external electron donor (EED) on the activity and reaction kinetics of ZN catalyst (TiC14//MgCl2—ethyl benzoate/diisobutyl phthalate) in propylene polymerization was studied. The polymerization kinetic was studied for different types of catalysts with various types of EEDs. To correlate the kinetic behavior of propylene polymerization and various reactions taking place during the polymerization, we have studied in situ interactions of EEDs with co-catalyst by FT-NMR. The used EEDs are (1) p-isopropoxy methyl benzoate (PIPMB), (2) diphenyldimethoxy silane (DPDMS) and (3) mixture of isopropyl myristate (IPM) and (DPDMS) were interacted with triethyl aluminum (TEAl) at defined molar ratios. In the diester type of catalyst, two types of kinetic profile were observed with two different types of EED systems. Initially very fast polymerization kinetic was observed when only silane type of EED was used during polymerization which became steady with mixed EED (Silane + Aliphatic Ester). This EED system shows steady-state and controllable kinetic characteristics due to mixing of IPM with silane. The study by FT-NMR spectroscopy indicated the formation of the new compounds that are inhibiting the rate of polymerization reaction. The compounds, such as ketones and alcohols, are responsible for controlling the rate of polymerization reaction. The contribution of each of these product formations during processes depends on the catalyst composition and on the polymerization conditions.Graphical abstract[graphic not available: see fulltext]
TI - Insight of co-catalyst and external donor for propylene polymerization in Ziegler–Natta catalysis: FT-NMR study
JF - Polymer Bulletin
DO - 10.1007/s00289-024-05144-w
DA - 2024-07-01
UR - https://www.deepdyve.com/lp/springer-journals/insight-of-co-catalyst-and-external-donor-for-propylene-polymerization-nnf36N8GaJ
SP - 9091
EP - 9111
VL - 81
IS - 10
DP - DeepDyve
ER -