Results 11 to 20 of about 600,060 (165)

Fluid-mediated nuclearity control in heterogeneous polyolefin catalysis [PDF]

Nature Communications
The nuclearity of active sites in heterogeneous Ziegler-Natta catalysts fundamentally governs polyolefin microstructure, yet its dynamic regulation during polymerization remains challenging.
Zaitian He, Jingyuan Sun, Qingyuan Zheng, Wei Li, Lynn F. Gladden, Jingdai Wang, Yongrong Yang   +6 more
doaj   +2 more sources

Immobilizing metallocene by solid polymethylaluminoxane “sMAO” for slurry-phase ethylene-1-hexene copolymerization [PDF]

MATEC Web of Conferences, 2022
In the field of olefin catalytic polymerization, metallocene catalysts show higher activity than traditional Ziegler-Natta catalysts. In this study, benzoic acid catalyzed the controlled hydrolysis of trimethylaluminum (TMA) to methylaluminoxane (MAO ...
Wu Chaofan, Ge Tengjie, Jiang Zeyu, Jiang Yanfeng, Zhang Qian, Li Jian   +5 more
doaj   +1 more source

Synthesis of Isotactic Polybutene-1 with Ziegler-Natta Catalyst [PDF]

علوم و تکنولوژی پلیمر, 2022
Hypothesis: Butene-1 is in excess in the polyolefin plants of Iran. Considering the properties of isotactic polybutene-1, including high creep and environmental stress cracking resistances, excellent elastic reversibility and good chemical abrasion ...
shokoufeh Hakim, Mehdi Nekomanesh, Hengameh Honarkar   +2 more
doaj   +1 more source

Dataset of energetically accessible structures of MgCl2/TiCl4 clusters for Ziegler-Natta catalysts

Data in Brief, 2021
This data article provides a dataset of the energetically accessible structures including the most stable structures of xMgCl2/yTiCl4 nanoplates (x = 6–19, y = 0–4).
Gentoku Takasao, Toru Wada, Ashutosh Thakur, Patchanee Chammingkwan, Minoru Terano, Toshiaki Taniike   +5 more
doaj   +1 more source

Determination of kinetic parameters for ethylene polymerization (with and without hydrogen) by Ziegler-Natta catalyst. [PDF]

Polyolefins Journal, 2020
In this study, slurry polymerization kinetics of ethylene with TiCl4/Mg(OEt)2/AlR3 Ziegler-Natta catalysts in various conditions using the model of sum square error (SSE) (method I) and model of least square error (LSE) (Method II) was investigated.
Seyed Mehdi Ghafelebashi Zaranda, Ali Safinejad   +1 more
doaj   +1 more source

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

System Identification for Experimental Study for Polymerization Catalyst Reaction in Fluidized Bed [PDF]

, 2011
In this work, system identification method is used to capture the reactor characteristics of production rate of polyethylene (PE) based on published experimental data. The identification method is used to measure the percentage effect on the production
Ahmmed S. Ibrehem, Ibrehem, A. S.
core   +2 more sources

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, Amir Heydarinasab, Ali Vaziri, Seyed Mehdi Ghafelebashi Zarand   +3 more
doaj   +1 more source

Structural Characterization of the EtOH–TiCl₄–MgCl₂ Ziegler–Natta Precatalyst [PDF]

, 2016
The Ziegler–Natta polymerization is one major example of application of catalysis in industry. Since the first discovery of Ziegler and Natta, several modifications of the catalyst have been developed, in order to improve its performance.
D. Gajan (2925687), K. Sanders (2925693), G. Pintacuda (2311231), V. Monteil (1737115), A. Lesage (2730706), V. D’Anna (2106346), S. Norsic (2925684), A. J. Pell (2925690), C. Copéret (2925681), P. Sautet (1964296)   +9 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, Patchanee Chammingkwan, Toshiaki Taniike, Minoru Terano   +3 more
doaj   +1 more source