Recent advances in high-temperature fractionation of polyolefins
The synthesis and characterization of polyolefins continues to be one of the most important
areas for academic and industrial research. One consequence of the development of new …
areas for academic and industrial research. One consequence of the development of new …
Accelerating the research approach to Ziegler–Natta catalysts
Despite 60 years of history and a stunning success, Ti-based Ziegler–Natta catalysts for the
production of isotactic polypropylene remain black-box systems, and progress still relies on …
production of isotactic polypropylene remain black-box systems, and progress still relies on …
Development of large-scale stopped-flow technique and its application in elucidation of initial Ziegler–Natta olefin polymerization kinetics
The stopped-flow (SF) technique has been extensively applied to study Ziegler–Natta (ZN)
olefin polymerization kinetics within an extremely short period (typically< 0.2 s) for …
olefin polymerization kinetics within an extremely short period (typically< 0.2 s) for …
A new technique for characterizing comonomer distribution in polyolefins: high-temperature thermal gradient interaction chromatography (HT-TGIC)
R Cong, W deGroot, A Parrott, W Yau, L Hazlitt… - …, 2011 - ACS Publications
This paper documents a new polyolefin characterization technique, high-temperature
thermal gradient interaction chromatography (HT-TGIC or TGIC), to quantify comonomer …
thermal gradient interaction chromatography (HT-TGIC or TGIC), to quantify comonomer …
Pyridylamido hafnium and zirconium complexes: Synthesis, dynamic behavior, and ethylene/1-octene and propylene polymerization reactions
Hafnium and zirconium pyridylamido complexes were prepared by the reaction of
deprotonated ligand with MCl4 followed by alkylation with MeMgBr. 1H NMR analysis of the …
deprotonated ligand with MCl4 followed by alkylation with MeMgBr. 1H NMR analysis of the …
Expanding the origin of stereocontrol in propene polymerization catalysis
Originally developed on heterogeneous Ziegler–Natta (ZN) catalysts, the model of “chiral
growing chain conformation” developed by Corradini to explain the origin of stereocontrol in …
growing chain conformation” developed by Corradini to explain the origin of stereocontrol in …
Efficient synthesis of thermoplastic elastomeric amorphous ultra-high molecular weight atactic polypropylene (UHMWaPP)
CGC Rice, JC Buffet, ZR Turner, D O'Hare - Polymer Chemistry, 2022 - pubs.rsc.org
The selective and high-yielding synthesis of fully amorphous ultra-high molecular weight
atactic polypropylene (UHMWaPP), with weight-average molecular weights (Mw) up to 2.0 …
atactic polypropylene (UHMWaPP), with weight-average molecular weights (Mw) up to 2.0 …
Ziegler–Natta catalysts: Regioselectivity and “hydrogen response”
A Vittoria, A Meppelder, N Friederichs, V Busico… - ACS …, 2019 - ACS Publications
Advanced High Throughput Experimentation (HTE) methods were applied to quantify the
regioselectivity and the so-called “hydrogen response” in propene polymerization of four …
regioselectivity and the so-called “hydrogen response” in propene polymerization of four …
Of poisons and antidotes in polypropylene catalysis
Quenched‐flow studies of MgCl2‐supported Ziegler–Natta catalysts were combined for the
first time with 13C NMR fingerprinting of the nascent polymer and conclusively proved that …
first time with 13C NMR fingerprinting of the nascent polymer and conclusively proved that …
Catalyst nuclearity effects on Stereo-and Regioinduction in Pyridylamidohafnium-Catalyzed Propylene and 1-Octene polymerizations
In comparison to monometallic controls, bimetallic olefin polymerization catalysts often
exhibit superior performance in terms of higher polyolefin M w, higher comonomer …
exhibit superior performance in terms of higher polyolefin M w, higher comonomer …