Análise de copolímeros de etileno alfa-olefinas por meio de técnicas de fracionamento [PDF]
Polímeros, 2000 Este trabalho apresenta a avaliação da heterogeneidade de resinas comerciais de copolímeros de etileno-1-buteno, produzidas por diferentes processos com catalisadores Ziegler-Natta e de resinas de copolímeros de etileno-1-hexeno sintetizadas em ...
Fernanda F. N. Escher +3 more
doaj +1 more source
Active site nature of magnesium dichloride-supported titanocene catalysts in olefin polymerization [PDF]
Polyolefins Journal, 2015 Heterogeneous Ziegler-Natta and homogeneous metallocene catalysts exhibit greatly different active sitenature in olefin polymerization. In our previous study, it was reported that MgCl2-supported titanocenecatalysts can generate both Ziegler-Natta-type ...
Toshiaki Taniike +2 more
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The charge percolation mechanism and simulation of Ziegler-Natta polymerizations, part VI: Mechanism of ethylene polymerization by supported chromium oxide [PDF]
Journal of the Serbian Chemical Society, 2007 Despite intensive research over the last 50 years, many questions concerning ethylene polymerization by supported chromium oxide are still unanswered. Hence, the very fundamental issues of this polymerization are discussed in this paper. It is shown that
Stoiljković Dragoslav +4 more
doaj +3 more sources
A Study on the Effect of Catalyst Types on Microstructure of Ethylene/1-Hexene Copolymer by Thermal Fractionation [PDF]
علوم و تکنولوژی پلیمر, 2015 Olefinic copolymers of ethylene/1-hexene were synthesized by three main types of supported catalysts, including Philips, Ziegler-Natta and metallocene catalysts, and the specific microstructural features delivered by each class of the catalysts were ...
Seyed Mohammad Mehdi Mortazavi
doaj +1 more source
A Highly Transparent Thermoplastic Synthesized from Ethylene that Melts Above 200 °C. [PDF]
Angew Chem Int Ed EnglWe introduce a highly transparent ethylene‐based thermoplastic (transmittance of 92%, haze of 8% and clarity of 92%) with a very low density (0.86g cm−3) and an high melting point (up to 228 °C). Abstract Polyolefin‐based thermoplastics are the most widely used polymers and produced in megaton scale.
Lukas F +3 more
europepmc +3 more sources
Transition Metal–(μ-Cl)–Aluminum Bonding in α-Olefin and Diene Chemistry
Molecules, 2022 Olefin and diene transformations, catalyzed by organoaluminum-activated metal complexes, are widely used in synthetic organic chemistry and form the basis of major petrochemical processes.
Ilya E. Nifant’ev +2 more
doaj +1 more source
Polietileno: principais tipos, propriedades e aplicações [PDF]
Polímeros, 2003 A estrutura de cada polímero tem influência direta sobre a sua densidade e suas propriedades mecânicas. Ramificações longas, como as presentes no polietileno de baixa densidade, por exemplo, aumentam a resistência ao impacto, diminuem a densidade e ...
Fernanda M. B. Coutinho +2 more
doaj +1 more source
A Mathematical Model for Investigating the Effect of Reaction Temperature and Hydrogen Amount on the Catalyst Yield during Propylene Polymerization [PDF]
Kemija u Industriji, 2019 In this study, the effect of reaction temperature and hydrogen amount, as the most effective process variables on the Ziegler-Natta catalysts yield during propylene polymerization, was investigated with the aid of a validated mathematical model.
Gholam Hossain Varshouee +3 more
doaj +1 more source
Промышленные испытания новой модификации титан-магниевого катализатора полимеризации пропилена [PDF]
, 2002 Рассмотрены состав, свойства и основные области применения современных каталитических систем IV и V поколений для промышленного производства полимеров на основе пропилена.
Ионов, Андрей Рудольфович +5 more
core +2 more sources
Addition of a second alcohol in magnesium ethoxide synthesis as a way to vary the pore architecture of Ziegler-Natta catalysts [PDF]
Polyolefins Journal, 2015 In Ziegler-Natta olefin polymerization, the pore architecture of catalysts plays a crucial role in catalytic performances and polymer properties. While the type of preparation routes (such as chemical reaction and solution precipitation) greatly affects ...
Toshiaki Funako +3 more
doaj +1 more source