Results 51 to 60 of about 856 (180)

How can pH value during catalyst preparation affect the performance of vanadium-modified (SiO2/MgO/ MgCl2)•TiClx Ziegler-Natta polyethylene catalysts [PDF]

Polyolefins Journal, 2018
Vanadium-modified (SiO2/MgO/MgCl2)•TiClx Ziegler-Natta catalysts were prepared through co-impregnation of water-soluble magnesium and vanadium salts under different pH values.
Ting Fu, Ruihua Cheng, Xuelian He, Zhen Liu, Zhou Tian, Boping Liu   +5 more
doaj   +1 more source

Cyclic Olefin Copolymers as Versatile Materials for Advanced Engineering Applications

Advanced Functional Materials, Volume 36, Issue 47, 11 June 2026.
Cyclic olefin copolymers (COCs) are presented as highly versatile materials combining tunable synthesis, excellent optical properties, and mechanical robustness. Their potential spans microfluidics, bioengineering, and advanced electronics, while emerging self‐healing and sustainable solutions highlight future opportunities.
Giulia Fredi, Norma Mallegni, Andrea Dorigato, Mario Milazzo   +3 more
wiley   +1 more source

“Naked” Divalent Metal Cations Stabilized by Weakly Coordinating Anions: Syntheses, Properties, and Emerging Applications

European Journal of Inorganic Chemistry, Volume 29, Issue 14, 14 May 2026.
The preparation of soluble and stable metal M2+ dications only stabilized by weakly coordinating anions, that is, M[WCA]2 salts, is an emerging field that, beyond its fundamental interest, holds promise in reactivity due to the high electrophilicity of the central M2+ center.
Samuel Dagorne, Béatrice Jacques, Geetika Gupta, Rudolf J. Wehmschulte   +3 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  

Process Modeling for Propylene Polymerization to Transfer Reaction Kinetics From Lab to Plant

Chemie Ingenieur Technik, Volume 98, Issue 5, Page 254-261, May 2026.
The modeling approach combines an industrial model for a fourth‐generation Ziegler–Natta catalyst with lab‐scale derived kinetics of a novel fifth‐generation catalyst. By transferring intrinsic kinetics across scales, polypropylene production can be predicted. Accurate melt flow rate prediction is only obtained with an additional adjustment.
Anna Konopka, Matthias Feigel, Johanna Fernengel, Maximilian Dochnahl, Richard W. Fischer, Olaf Hinrichsen   +5 more
wiley   +1 more source

Study on the Effects of Temperature, Time and the Policy of Prepolymerization on Particle Morphology in Propylene Slurry Polymerization with Heterogeneous Ziegler-Natta Catalysts [PDF]

علوم و تکنولوژی پلیمر, 2007
The effects of temperature, time and the strategy of prepolymerization were studied on the morphology of polypropylene particles. propylene polymerization was carried out in slurry phase using 4th generation of Ziegler-Natta Catalyst, cyclohexylmethyl ...
G. Pircheraghi, S. Pourmahdian, M. Vatankhah   +2 more
doaj   +1 more source

Electron Microscopy Transfer System to Protect Atmosphere‐Sensitive Materials for Scanning Electron Microscopy Characterization

Microscopy Research and Technique, Volume 89, Issue 5, Page 759-768, May 2026.
SEM–EDX and XRD characterization confirm that pouches made from readily available aluminum foil, used in combination with a commercial cryo‐EM transfer system, effectively protect highly atmosphere‐sensitive and/or hygroscopic materials from contamination during transfer from inert environments to the SEM vacuum chamber.
Louis G. Corcoran, Ellen M. Monzo, Chinomso E. Onuoha, Shivasheesh Varshney, Han Seung Lee, Chris Frethem, Bharat Jalan, Alon V. McCormick, R. Lee Penn   +8 more
wiley   +1 more source

Ethylene Homopolymerization by Ziegler-Natta (TiCl4/MgCl2) Catalyst through Full Factorial Experimental Design [PDF]

علوم و تکنولوژی پلیمر, 2009
Full factorial experimental design (23) for the evaluation of slurry ethylene polymerization in the presence of an industrial TiCl4/MgCl2 Ziegler-Natta catalyst was employed.
S. Hakim, M.M. Mortazavi, L. Moballegh, M. Nekoomanesh Haghighi   +3 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

اثر اصلاح کنند ه ها روی فعالیت کاتالیزورهای زیگلر-ناتا و خواص نهایی پلیمر در پلیمرشدن اولفین ها [PDF]

Baspārish, 2015
فعالیت کاتالیزور از مهم ترین پارامترها در فرایندهای پلیمرشدن است. برای یک سامانه کاتالیزوریفعالیت ممکن است به شرایط پلیمرشدن از قبیل دما و فشار وابسته باشد.
رضا بازوند, نعیمه بحری, مهدی نکومنش, حسین عابدینی   +3 more
doaj   +1 more source