Search Results - "Cipullo, Roberta"

Extraction of Reliable Molecular Information from Diffusion NMR Spectroscopy: Hydrodynamic Volume or Molecular Mass? by Zaccaria, Francesco, Zuccaccia, Cristiano, Cipullo, Roberta, Macchioni, Alceo

“…Measuring accurate translational self‐diffusion coefficients (Dt) by NMR techniques with modern spectrometers has become rather routine. In contrast, the…”
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Monitoring the Kinetics of Internal Donor Clean-up from Ziegler–Natta Catalytic Surfaces: An Integrated Experimental and Computational Study by Vittoria, Antonio, Antinucci, Giuseppe, Zaccaria, Francesco, Cipullo, Roberta, Busico, Vincenzo

“…Surface modification of MgCl2-supported Ziegler–Natta catalysts (ZNCs) by means of organic Lewis bases, either used as precatalyst components (“internal…”
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Accelerating the Research Approach to Ziegler–Natta Catalysts by Busico, Vincenzo, Cipullo, Roberta, Mingione, Alessio, Rongo, Luca

“…Despite 60 years of history and a stunning success, Ti-based Ziegler–Natta catalysts for the production of isotactic polypropylene remain black-box systems,…”
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On the Nature of the Lewis Acidic Sites in “TMA‐Free” Phenol‐Modified Methylaluminoxane by Zaccaria, Francesco, Zuccaccia, Cristiano, Cipullo, Roberta, Budzelaar, Peter H. M., Macchioni, Alceo, Busico, Vincenzo, Ehm, Christian

“…“Structural” AlMe2(bht) was found to be an integral building block of the “TMA‐free” olefin polymerization cocatalyst MAO/BHT (TMA = trimethylaluminum, MAO =…”
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Reactivity Trends of Lewis Acidic Sites in Methylaluminoxane and Some of Its Modifications by Zaccaria, Francesco, Budzelaar, Peter H. M, Cipullo, Roberta, Zuccaccia, Cristiano, Macchioni, Alceo, Busico, Vincenzo, Ehm, Christian

“…The established model cluster (AlOMe)16(AlMe3)6 for methylaluminoxane (MAO) cocatalyst has been studied by density functional theory, aiming to rationalize the…”
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Methylaluminoxane’s Molecular Cousin: A Well-defined and “Complete” Al-Activator for Molecular Olefin Polymerization Catalysts by Zaccaria, Francesco, Zuccaccia, Cristiano, Cipullo, Roberta, Budzelaar, Peter H. M, Vittoria, Antonio, Macchioni, Alceo, Busico, Vincenzo, Ehm, Christian

“…Catalytic activity in olefin polymerization depends not only on the catalyst but also, crucially, on activator/alkylator/scavenger “packages.” Along with…”
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Role of Solvent Coordination on the Structure and Dynamics of ansa -Zirconocenium Ion Pairs in Aromatic Hydrocarbons by Sian, Leonardo, Dall’Anese, Anna, Macchioni, Alceo, Tensi, Leonardo, Busico, Vincenzo, Cipullo, Roberta, Goryunov, Georgy P., Uborsky, Dmitry, Voskoboynikov, Alexander Z., Ehm, Christian, Rocchigiani, Luca, Zuccaccia, Cristiano

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Connection of Stereoselectivity, Regioselectivity, and Molecular Weight Capability in rac-R′2Si(2-Me-4-R-indenyl)2ZrCl2 Type Catalysts by Ehm, Christian, Vittoria, Antonio, Goryunov, Georgy P, Kulyabin, Pavel S, Budzelaar, Peter H. M, Voskoboynikov, Alexander Z, Busico, Vincenzo, Uborsky, Dmitry V, Cipullo, Roberta

“…A set of 19 silicon-bridged C 2-symmetric zirconocenes rac-R′2Si­(2-Me-4-R-indenyl)2ZrCl2 of varying steric demand in position 4 were synthesized and screened…”
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A Hydrocarbon Soluble, Molecular and "Complete" Al-Cocatalyst for High Temperature Olefin Polymerization by Urciuoli, Gaia, Zaccaria, Francesco, Zuccaccia, Cristiano, Cipullo, Roberta, Budzelaar, Peter H M, Vittoria, Antonio, Ehm, Christian, Macchioni, Alceo, Busico, Vincenzo

“…The dinuclear aluminum salt {[ Bu (DMA)Al] ( -H)} [B(C F ) ] ( ; DMA = , -dimethylaniline) is the prototype of a new class of molecular cocatalysts for…”
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An Integrated High Throughput Experimentation/Predictive QSAR Modeling Approach to ansa -Zirconocene Catalysts for Isotactic Polypropylene by Ehm, Christian, Vittoria, Antonio, Goryunov, Georgy P, Izmer, Vyatcheslav V, Kononovich, Dmitry S, Samsonov, Oleg V, Di Girolamo, Rocco, Budzelaar, Peter H M, Voskoboynikov, Alexander Z, Busico, Vincenzo, Uborsky, Dmitry V, Cipullo, Roberta

“…Compared to heterogenous Ziegler-Natta systems (ZNS), -metallocene catalysts for the industrial production of isotactic polypropylene feature a higher…”
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Assignment of Regioirregular Sequences in the 13C NMR Spectrum of Syndiotactic Polypropylene by Cipullo, Roberta, Vittoria, Antonio, Busico, Vincenzo

“…The 13C NMR microstructure of a polypropylene (PP) sample is a fundamental source of information on its properties, and also a ‘fingerprint’ of the catalytic…”
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High-Throughput Screening in Olefin-Polymerization Catalysis: From Serendipitous Discovery Towards Rational Understanding by Busico, Vincenzo, Pellecchia, Roberta, Cutillo, Francesco, Cipullo, Roberta

“…High–throughput‐screening (HTS) tools and methods are used more and more, especially in industry, in the search for new, selective organometallic catalysts. In…”
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Chain Transfer to Solvent and Monomer in Early Transition Metal Catalyzed Olefin Polymerization: Mechanisms and Implications for Catalysis by Francesco Zaccaria, Peter H. M. Budzelaar, Cristiano Zuccaccia, Roberta Cipullo, Alceo Macchioni, Vincenzo Busico, Christian Ehm

“…Even after several decades of intense research, mechanistic studies of olefin polymerization by early transition metal catalysts continue to reveal unexpected…”
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Polypropylene “Chain Shuttling” at Enantiomorphous and Enantiopure Catalytic Species:  Direct and Quantitative Evidence from Polymer Microstructure by Alfano, Francesca, Boone, Harold W, Busico, Vincenzo, Cipullo, Roberta, Stevens, James C

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Nonconventional Catalysts for Isotactic Propene Polymerization in Solution Developed by Using High-Throughput-Screening Technologies by Boussie, Thomas R., Diamond, Gary M., Goh, Christopher, Hall, Keith A., LaPointe, Anne M., Leclerc, Margarete K., Murphy, Vince, Shoemaker, James A. W., Turner, Howard, Rosen, Robert K., Stevens, James C., Alfano, Francesca, Busico, Vincenzo, Cipullo, Roberta, Talarico, Giovanni

“…A textbook example of catalyst discovery, optimization, and commercial implementation is provided with the discovery of a class of Hf‐based non‐metallocene…”
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Hafnium vs. Zirconium, the Perpetual Battle for Supremacy in Catalytic Olefin Polymerization: A Simple Matter of Electrophilicity? by Vittoria, Antonio, Goryunov, Georgy P, Izmer, Vyatcheslav V, Kononovich, Dmitry S, Samsonov, Oleg V, Zaccaria, Francesco, Urciuoli, Gaia, Budzelaar, Peter H M, Busico, Vincenzo, Voskoboynikov, Alexander Z, Uborsky, Dmitry V, Ehm, Christian, Cipullo, Roberta

“…The performance of -symmetric -hafnocene catalysts for isotactic polypropylene typically deteriorates at increasing temperature much faster than that of their…”
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Design of Stereoselective Ziegler-Natta Propene Polymerization Catalysts by Busico, Vincenzo, Cipullo, Roberta, Pellecchia, Roberta, Ronca, Sara, Roviello, Giuseppina, Talarico, Giovanni

“…After five decades of largely serendipitous (albeit formidable) progress, catalyst design in Ziegler-Natta olefin polymerization, i.e., the rational…”
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Intra- and Intermolecular NMR Studies on the Activation of Arylcyclometallated Hafnium Pyridyl-Amido Olefin Polymerization Precatalysts by Zuccaccia, Cristiano, Macchioni, Alceo, Busico, Vincenzo, Cipullo, Roberta, Talarico, Giovanni, Alfano, Francesca, Boone, Harold W, Frazier, Kevin A, Hustad, Phillip D, Stevens, James C, Vosejpka, Paul C, Abboud, Khalil A

“…Pyridyl-amido catalysts have emerged recently with great promise for olefin polymerization. Insights into the activation chemistry are presented in an initial…”
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Improving the Behavior of Bis(phenoxyamine) Group 4 Metal Catalysts for Controlled Alkene Polymerization by Cipullo, Roberta, Busico, Vincenzo, Fraldi, Natascia, Pellecchia, Roberta, Talarico, Giovanni

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Improving the Performance of Methylalumoxane:  A Facile and Efficient Method to Trap “Free” Trimethylaluminum by Busico, Vincenzo, Cipullo, Roberta, Cutillo, Francesco, Friederichs, Nic, Ronca, Sara, Wang, Bing

“…The presence of “free” trimethylaluminum (TMA) in methylalumoxane (MAO) solutions can be highly detrimental to the performance of metallocene and…”
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