Results 51 to 60 of about 2,112 (213)

Deprotonative C(sp3)/C(sp2)–H (Multi)Silylation of (Hetero)Arenes Mediated by NaTMP

Angewandte Chemie, Volume 138, Issue 21, 18 May 2026.
An operationally simple protocol using a strongly basic sodium amide in combination with sterically emcumbered silicon electrophiles enables the deprotonative C–H (multi)silylation of a myriad of (hetero)arenes. Mechanistic investigations highlight the pivotal role of steric and coordination effects in controlling the regioselectivity and efficiency of
David Sánchez‐Roa, Sophia Belrhomari, Ana McGinley, Clevin Anto Liju, Manting Mu, Max García‐Melchor, Eva Hevia   +6 more
wiley   +2 more sources

Heterogenized Methylaluminoxane and Isobutylaluminoxane as activators for metallocene catalysts [PDF]

Kinetics and Catalysis, 2006
Heterogenized alkylaluminoxanes prepared in situ on the montmorillonite (MMT) surface by the partial hydrolysis of AIR3 with water of the support are effective activators for metallocenes. The thermal destruction of isobutylaluminoxane molecules in the MMT-H2O/Al(i-Bu)3 system has been studied by the temperature-programmed desorption method coupled ...
L. A. Novokshonova, T. M. Ushakova, V. G. Krasheninnikov, N. Yu. Kovaleva, T. A. Ladygina, M. V. Lysova, I. O. Leipunskii, A. N. Zhigach, M. L. Kuskov   +8 more
openaire   +1 more source

Research progress on flexible MXene‐based materials in advanced energy storage devices: From preparation strategies to device applications

FlexMat, EarlyView.
This review summarizes MXene synthesis and flexible electrode fabrication for FESDs, highlighting their potential owing to high conductivity and flexibility, and outlines future research directions. Abstract The rapid development of wearable and portable electronics has created demand for flexible energy storage systems (FESDs) that not only exhibit ...
Nanxi Miao, Ying Lu, Xing Gao, Lingzi Pan, Meng Gao, Chenxi Zhang, Ming Liu, Shizhong Wang, Zhongyu Weng, Huan Pang, Huijie Zhou   +10 more
wiley   +1 more source

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

Tailoring supported olefin polymerisation catalysts using non-equilibrium plasmas [PDF]

, 1999
Supported olefin polymerisation catalysts are used to produce more than 20 million tonnes of polyethylene a year. In this thesis, the application of non- equilibrium plasmas to Phillips, Ziegler-Natta, and metallocene catalysts is described. A Cr(acetate)
Godfrey, Simon Paul
core  

Comparison of catalytic behaviors of various silica‐supported metallocene catalysts in syndiospecific polymerization of styrene

, 2006
Homogeneous metallocene catalysts and several kinds of silica-supported metallocene catalysts were employed to investigate their catalytic behavior for styrene polymerization.
Jin‐Heong Yim, Son‐Ki Ihm, Ihm, Son Ki, Yim, Jin-Heong   +3 more
core   +1 more source

Highly Active Half-Metallocene Chromium(III) Catalysts for Ethylene Polymerization Activated by Trialkylaluminum

, 2016
Highly active half-metallocene type chromium(III) catalysts for ethylene polymerization have been developed. High molecular weight linear polyethylene (Mn > 1 000 000 g/mol) was produced by these catalysts in the presence of a relatively small amount of ...
Yanchun Tao (2502553), Wei Gao (2085), Tieqi Xu (1446679), Jianguo Ni (2502550), Ling Ye (111749), Ying Mu (1505536)   +5 more
core   +4 more sources

Catalisadores metalocênicos: aspectos gerais e heterogeneização Metallocene catalysts: general aspects and heterogenization

Polímeros, 1998
Este trabalho apresenta uma discussão sobre aspectos gerais da nova tecnologia de síntese de polímeros com microestrutura e propriedades controladas, obtidos via sistema catalítico metaloceno/MAO.
Maria de Fátima V. Marques, Patricia Aragão C. Junior, Maria José C. Guimarães, Fernanda M. B. Coutinho   +3 more
doaj   +1 more source

Preparation of High-Purity Ammonium Tetrakis(pentafluorophenyl)borate for the Activation of Olefin Polymerization Catalysts

Molecules, 2021
Homogeneous olefin polymerization catalysts are activated in situ with a co-catalyst ([PhN(Me)2-H]+[B(C6F5)4]− or [Ph3C]+[B(C6F5)4]−) in bulk polymerization media. These co-catalysts are insoluble in hydrocarbon solvents, requiring excess co-catalyst (>3
Hyun-Ju Lee, Jun-Won Baek, Yeong-Hyun Seo, Hong-Cheol Lee, Sun-Mi Jeong, Junseong Lee, Chong-Gu Lee, Bun-Yeoul Lee   +7 more
doaj   +1 more source

Impact of Commercial Polyolefin Architecture and Composition on Its Ability to Compatibilize High‐Density Polyethylene/Isotactic Polypropylene Blends

Journal of Polymer Science, EarlyView.
This research elucidates the relationship between the molecular structure of commercially available ethylene–propylene copolymers and an ethylene/1‐olefin copolymer and its ability to compatibilize high‐density polyethylene/isotactic polypropylene blends. These findings indicate that the compatibilization of these blends with random copolymers benefits
Bailey Eberle, Susan K. Houston, Hannah Giffin, Mark Dadmun   +3 more
wiley   +1 more source