Results 31 to 40 of about 700 (179)

Employing Moment Equations Model to Study the Effect of Different Active Centers on Homopolymerization Kinetics of Ethylene [PDF]

علوم و تکنولوژی پلیمر, 2008
Ethylene was homopolymerized over Ziegler-Natta catalyst and the homopolymerization was modeled using moment equations. Mechanism was modeled according to five different reaction centers of catalyst.
M. Salami-Kalajahi, M. Najafi, V. Haddadi-Asl, S.M. Ghafelebashi-Zarand   +3 more
doaj   +1 more source

Copolymerization of Ethylene and Propylene Using 4th Generation Ziegler- Natta Catalyst: Influence of Cocatalyst, External Electron Donor and Hydrogen [PDF]

علوم و تکنولوژی پلیمر, 2007
Copolymerization of ethylene and propylene was investigated using a 4th generation phthalate Ziegler-Natta catalyst in normal hexane in a Buchi reactor.
R. Mehtarani, H. Arabi, M.B. Teymori, S.S. Hosseini shiraz, V. Eslami manesh   +4 more
doaj   +1 more source

Design of stereoselective Ziegler–Natta propene polymerization catalysts [PDF]

Proceedings of the National Academy of Sciences, 2006
After five decades of largely serendipitous (albeit formidable) progress, catalyst design in Ziegler–Natta olefin polymerization, i.e., the rational implementation of new active species to target predetermined polyolefin architectures, has ultimately become a realistic ambition, thanks to a much deeper fundamental understanding and
BUSICO, VINCENZO, CIPULLO, ROBERTA, PELLECCHIA R, RONCA S, ROVIELLO G, TALARICO, GIOVANNI   +5 more
openaire   +3 more sources

One century of teaching, research, and innovation in chemical engineering in Mexico: The role of chemical engineering in the background and future of polymer science and industrial production in Mexico

The Canadian Journal of Chemical Engineering, EarlyView.
Timeline of key academic milestones and individuals that shaped chemical engineering at FQ‐UNAM and in Mexico. Abstract One hundred years after the beginning of the teaching of Chemical Engineering in Mexico, which started in 1925 in the former National School of Chemical Sciences, currently Faculty of Chemistry (FQ) at National Autonomous University ...
Patricia Pérez‐Salinas, Alberto Rosas‐Aburto, Eduardo Vivaldo‐Lima   +2 more
wiley   +1 more source

Ziegler-Natta Catalyst Preparation Process: Influential Parameters on Particles Morphology and Activity of Catalyst in Propylene Polymerization [PDF]

علوم و تکنولوژی پلیمر, 2013
Different parameters including temperature and amount of titanium tetrachloride (TiCl4) were examined with respect to Ziegler-Natta catalyst morphology and the catalyst performance during its preparation process.
Hassan Arabi, Hossein Abedini, Hamid Dolatshahi, Gholam-Reza Nejabat   +3 more
doaj   +1 more source

The coordinative state of aluminium alkyls in Ziegler–Natta catalysts [PDF]

Physical Chemistry Chemical Physics, 2018
Multinuclear solid-state NMR provides insight in the interactions of aluminium alkyl based cocatalysts in MgCl2-supported Ziegler–Natta catalysts.
E. S. (Merijn) Blaakmeer, Ernst R. H. van Eck, Arno P. M. Kentgens   +2 more
openaire   +2 more sources

Potential of Thermoset Polyolefins for FRP Concrete Reinforcing Bars

Polymer Composites, EarlyView.
Overview of XLPO and pDCPD resins for FRP reinforcing bars, highlighting resin chemistry, key performance characteristics, fiber sizing interactions, and principal degradation mechanisms in concrete environments. ABSTRACT Although thermoset polyolefins offer resistance to hydrolytic degradation and favorable processing characteristics, their potential ...
Osama Omar, Farzaneh Mahmoudi, Leonidas G. Bachas, Francisco De Caso, Brahim Benmokrane, Antonio Nanni   +5 more
wiley   +1 more source

Caracterização de polietilenos lineares de baixa densidade I.: determinação do teor de ramificação por métodos espectroscópicos Linear low density polyethylene characterization - I.: spectroscopic methods for comonomer content determination

Polímeros, 2005
Os polietilenos lineares de baixa densidade (LLDPE) apresentam propriedades variando amplamente em função da concentração e do tipo de comonômero utilizado na copolimerização, além do tipo de catalisador.
Antonio C. Quental, Lilian S. Hanamoto, Maria I. Felisberti   +2 more
doaj   +1 more source

Oxidative Stability and Rheological Features in Recycled Composites Based on Postconsumer Polypropylene and Antioxidant‐Loaded Silicas

Polymer Engineering &Science, EarlyView.
Role of antioxidant supported on MCM‐41 and nano‐silica in enhancing oxidation induction time (OIT) and nucleation performance. ABSTRACT Plastic recycling efforts are hindered by the reduction of material properties in recyclates stemming from oxidative degradation of their polymeric chains.
Enrique Blázquez‐Blázquez, Kalman B. Migler, Tamara Díez‐Rodríguez, María L. Cerrada, Ernesto Pérez   +4 more
wiley   +1 more source

Speciation, Structural Refinement, and Distribution of Ti Sites in Titanium Silicalite‐1 From 47/49Ti NMR Crystallography at 28.2 Tesla

Angewandte Chemie, Volume 138, Issue 15, 6 April 2026.
Titanium silicalite‐1 (TS‐1), used in industrial selective oxidation processes, depends on specific, yet still unresolved Ti sites, dispersed within the framework of an MFI‐zeolite. Applying high field (28.2 T) 47/49Ti NMR and 17O NMR spectroscopy for an array of TS‐1 catalysts enables the development of an NMR crystallography protocol and the ...
Christoph J. Kaul, Jonas Koppe, Lukas Lätsch, Michael Wörle, Sadig Aghazada, Jacob B. Holmes, Christina Wartmann, Mingji Zheng, Albrecht Berkessel, Trees De Baerdemaeker, Andrei‐Nicolae Parvulescu, Karsten Seidel, J. Henrique Teles, Alexander V. Yakimov, Christophe Copéret   +14 more
wiley   +2 more sources