Results 71 to 80 of about 94,776 (218)

Tailoring polypropylene properties by package of internal/external donor in Ziegler Natta catalysts [PDF]

Polyolefins Journal
Insights have been developed into the influence of different structures, including bismethoxymethylfluorene (B) and 2,2-diisopropyl succinate (I), on both internal donor (ID) and external donor (ED) roles on the performance of MgCl2/ID/TiCl4.
Nona Ghasemi Hamedani, Fatemeh Poorsank, Hassan Arabi, Seyed Mehdi Ghafelehbashi   +3 more
doaj   +1 more source

Correlation Between Vinyl Content of Recycled HDPE and Polymer Degradation: An NMR Approach

Journal of Applied Polymer Science, Volume 142, Issue 47, December 15, 2025.
The degradation behavior of high‐density polyethylene (HDPE) during recycling depends on its vinyl group content. This study shows that 1H NMR spectroscopy enables accurate assessment of vinyl groups unlike FTIR. Changes in melt flow and molecular weight with multiple processing are linked to vinyl content which could enable tailor‐made re‐additivation
Kim Hao Ng, Frank Malz, Elke Metzsch‐Zilligen, Rudolf Pfaendner   +3 more
wiley   +1 more source

Polimerização 1,4 - cis de butadieno com o sistema catalítico tetracloreto de titânio/triisobutilalumínio/iodo 1,4 cis-Polymerization of butadiene by the catalyst system titanium tetrachloride/triisobutylaluminium/iodine

Polímeros, 2000
Foi utilizado o sistema catalítico tipo Ziegler-Natta modificado, constituído por TiCl4/I2/Al(i-Bu)3 para a síntese de polibutadieno com alto teor de unidades 1,4-cis.
Neusa M. T. Pires, Marcos A. S. Costa, Fernanda M. B. Coutinho   +2 more
doaj   +1 more source

The Alchemist, the Scientist, and the Robot: Exploring the Potential of Human‐AI Symbiosis in Self‐Driving Polymer Laboratories

Macromolecular Rapid Communications, Volume 46, Issue 23, December 5, 2025.
Can artificial intelligence fully replace humans in polymer discovery? How can we effectively harness AI's potential while preserving human creativity, ethics, and expertise? Does AI introduce new biases and interpretability challenges into SDL? This perspective aims to answer these important questions and advocates for symbiotic human‐AI intelligence ...
Bahar Dadfar, Berna Alemdag, Gözde Kabay   +2 more
wiley   +1 more source

Avaliação das condições de envelhecimento do sistema catalítico versatato de neodímio/hidreto de di-isobutilalumínio/cloreto de t-butila na polimerização de 1,3-butadieno

Polímeros, 2014
O objetivo deste trabalho foi estudar sistemas catalíticos ternários constituídos por versatato de neodímio, cloreto de t-butila e hidreto de di-isobutil-alumínio para a polimerização de 1,4-cis de butadieno em hexano.
Neusa Maria Tocchetto Pires, Bluma Guenther Soares, Fernanda Margarida Barbosa Coutinho, André Luiz Carneiro Simões, Marcos Antonio da Silva Costa   +4 more
doaj   +1 more source

Dimerization of 1-butene via zirconium-based Ziegler-Natta catalyst

, 2000
A zirconium-based Ziegler-Natta catalytic system has been tested in the dimerization of 1-butene. It was found that the concentration of Et2AlCl, Ph3P and PhONa as well as the reaction temperature had great influences on the activity and selectivity of ...
Han, XW, Zhang, WP, He, R, Bao, XH, Li, C   +4 more
core  

A Unified Model Explaining Heterogeneous Ziegler-Natta Catalysis

, 2015
We propose a model for MgCl2 supported Ziegler-Natta catalysts capable to reconcile the discrepancies emerged in the last 20 years, when experimental data were tried to be rationalized by molecular models.
Fan, Zhiqiang, Cavallo, Luigi, Luigi Cavallo (14607), Zhiqiang Fan (641950), Liguori, Dario, Credendino, Raffaele, Morini, Giampiero, Dario Liguori (1537450), Raffaele Credendino (1509127), Giampiero Morini (1537453)   +9 more
core   +1 more source

Principais aspectos da polimerização do 1,3-butadieno Principles aspects of butadiene 1,3 polymerization

Polímeros, 2005
Atualmente, há uma grande demanda pelo polibutadieno com alto teor de unidades 1,4-cis, devido às suas excelentes propriedades físicas, tais como alta resistência à abrasão, baixo desenvolvimento de calor, baixa resistência ao rolamento, maior ...
Denise S. S. Nunes, Fernanda M. B. Coutinho, Ivana L. Mello   +2 more
doaj   +1 more source

Organic Nanoparticles as Fragmentable Support for Ziegler-Natta Catalysts

, 2015
A fragmentable support material for Ziegler-Natta catalysts is presented based on micrometer-sized aggregates of polystyrene nanoparticles. Hydroxyl anchoring groups are introduced by copolymerization of hydroxymethylstyrene in emulsion process to ...
Sven Nietzel, Alsaygh, A., Gerhard Fink, Joe, D., Nietzel, S., Frank Schellenberger, Schellenberger, F., Muellen, K., Abdulhamid A. Alsaygh, Joseph W. Krumpfer, Krumpfer, J., Markus Klapper, Fink, G., Daejune Joe, Klaus Müllen, Klapper, M., Müllen, K.   +16 more
core   +1 more source

Des nach der seligen Ewigkeit reisenden Christen treuer Geleitsmann, welcher dem christlichen Pilger I. den richtigen Glaubens- und Lebens-Weg weiset, 2. nöthige Christenthums- und Pilgrims-Pflichten vorhält, 3. seine Gebets-Andacht und Herzens-Seufzer erwecket, 4. den Weg durch geistreiche Gesänger erbaulich verkürzet

[von Johann Rudolf ...
Ziegler, Johann Rudolf
core   +1 more source