Results 61 to 70 of about 2,075 (218)

Nano-Dispersed Ziegler-Natta Catalysts for 1 μm-Sized Ultra-High Molecular Weight Polyethylene Particles

Frontiers in Chemistry, 2018
A catalytic approach to synthesize microfine ultra-high molecular weight polyethylene (UHMWPE) particles was proposed based on the exploitation of nano-sized catalysts.
Patchanee Chammingkwan, Yusuke Bando, Minoru Terano, Toshiaki Taniike   +3 more
doaj   +1 more source

Production of titanium tetrachloride (TiCl4) from titanium ores: A review [PDF]

Polyolefins Journal, 2017
Titanium (Ti) is the ninth most abundant element on earth. The titanium mineral ores are widely distributed in different parts of the world. The two main ores of titanium include rutile (TiO2) and ilmenite (FeO.TiO2).
Hossein Bordbar, Ali Akbar Yousefi, Hossein Abedini   +2 more
doaj   +1 more source

Overcoming Challenges in 3D Printing of Polyolefins and Their Composites: A Review on Strategies for Improved Printability and Performance

Polymer Engineering &Science, Volume 66, Issue 5, Page 3100-3141, May 2026.
This review integrates the molecular fundamentals, key challenges, and mitigation strategies in polyolefin 3D printing, focusing on shrinkage, warpage, and adhesion control. It highlights material design approaches using recycled polyolefins and functional fillers to improve printability, mechanical properties, and sustainability in additive ...
Malik Hassan, Philip McMorran, Marwan Eid, Julia Blair, Amar K. Mohanty, Manjusri Misra   +5 more
wiley   +1 more source

An Investigation on Polymerization of Ethylene by Ziegler-Natta Catalyst in the Presence of a Promoter: Polymerization Behavior and Polymer Microstructure

Bulletin of Chemical Reaction Engineering & Catalysis, 2018
The effect of a halocarbon (ethyl chloride) as a promoter on a Ziegler-Natta catalyst composed of‌ T‌iCl4 (catalyst), AlEt3 (activator) and Mg(OEt)2 (support) in the polymerization of ethylene have been investigated.
Yaghoob Gholami, Majid Abdouss, Sadegh Abedi, Farhad Azadi, Pezhman Baniani, Maryam Arsalanfar   +5 more
doaj   +1 more source

Ti+4 determination in Ziegler–Natta polymerization catalysts via UV‒vis spectroscopy method [PDF]

Polyolefins Journal
The determination of Ti+4 in Ziegler–Natta catalysts is highly relevant for industrial plants that use Ziegler–Natta (ZN) catalysts based on TiCl4 as a source of titanium.
Jonas Biagini, Joao Henrique dos Santos
doaj   +1 more source

MgCl2 Support Preparation Techniques and Their Effects on Ziegler-Natta Catalysts Performance in Propylene Polymerization [PDF]

علوم و تکنولوژی پلیمر, 2013
A primary adduct of MgCl2.3.3EtOH (A0) was prepared by melt quenching and then it was further dealcoholated by thermal and chemical methods. In thermal dealcoholation, two different support samples with MgCl2.2.7EtOH (A1) and MgCl2.1.8EtOH (A2) formulas ...
Najmeh Hadian, Mehdi Nekoomanesh-Haghighi, Shokoofeh Hakim, Naeimeh Bahri-Laleh   +3 more
doaj   +1 more source

On the Bona Fide Sampling of Reaction Candidates in Red Moon Method by Replica‐Exchange Molecular Dynamics Method: REMD‐RM Method and Its Efficacy in Polymerization and Cross‐Linking Reactions of Polypropylene

Journal of Computational Chemistry, Volume 47, Issue 7, March 15, 2026.
Schematic representation of the REMD‐RM method, which integrates the Red Moon (RM) method and the replica‐exchange molecular dynamics (REMD) method. By enhancing molecular reconfiguration and diffusion in the reactant system, the REMD‐RM method can efficiently explore a wide phase space and effectively accelerate the search for reaction candidates ...
Kentaro Matsumoto, Yuichi Tanaka, Seiryu Umetani, Takashi Nakano, Masataka Nagaoka   +4 more
wiley   +1 more source

Sixtieth Anniversary of Ziegler-Natta Catalysts and Stereospecific Polymerization [PDF]

Kemija u Industriji, 2015
This review article highlights the history of the discoveries of organometallic catalysts and stereospecific polymerization of α-olefins, dienes and a number of vinyl monomers by Karl Ziegler and Giulio Natta sixty years ago, their developments and ...
Janović Z. , Veksli Z.
doaj  

Study of Ethylene Polymerization Kinetics by TiCl4/Mg(OC2H5)2 Catalyst and Determination of the Active Sites Concentration [PDF]

علوم و تکنولوژی پلیمر, 2008
Ethylene was polymerized in slurry phase over a TiCl4/Mg(OC2H5)2 catalyst activated by Al(C2H5)3. It was shown experimentally that mass transfer resistance has no effect on polymerization kinetics.
S. Hakim, M.M. Mortazavi
doaj   +1 more source

Olefin Polymerizations Oriented by Rational Designs of Group‐13 Compounds

The Chemical Record, Volume 26, Issue 3, March 2026.
In coordination olefin polymerization chemistry, boron and aluminum compounds play important roles in both catalyst components and monomers. This personal account introduces our recent progress on the development of catalyst systems featured by the design of group‐13 counteranions, as well as the application of boronic acid‐crosslinked polyolefins to ...
Ryo Tanaka, Yu Zou
wiley   +1 more source