Results 81 to 90 of about 360,310 (205)

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

Role of Titanium in Ti/SiO2-Supported Metallocene-based Olefin Polymerization Catalysts. Part 1: Genesis of Active Sites and Catalytic Performance [PDF]

, 2023
Performance enhancement of metallocene-based olefin polymerization catalysts can be obtained, among others, by the chemical modification of their support.
Welle, Alexandre, Weckhuysen, Bert M., Zanoni, Silvia, Cirriez, Virginie, Inorganic Chemistry and Catalysis, Sub Inorganic Chemistry and Catalysis   +5 more
core  

Polymerization of 3-methyl-1-butene promoted by metallocene catalysts

, 1996
3-Methyl-1-butene was polymd. in the presence of a no. of homogeneous metallocene catalysts (co-catalyst methylaluminoxane). Contrary to literature reports, it was found that even the simplest C2-sym. metallocenes promote the isotactic polymn.
Roberta Cipullo, Chadwick John C., Sudmeijer Olof, Anna Borriello, CIPULLO, ROBERTA, Borriello Anna, Olof Sudmeijer, John C. Chadwick, Vincenzo Busico, BUSICO, VINCENZO   +9 more
core   +1 more source

Alargamento da distribuição de massa molar de polímeros sintetizados com catalisadores metalocênicos dual-site Broadening of molecular weight distribution of polymers synthesized by metallocene-based dual-site catalysts

Química Nova, 2008
The main topics related to the use of dual-site catalysts in the production of polymers with broad molecular weight distribution are reviewed. The polymerization using dual-site catalysts is more economical and allows to produce a higher quality product ...
João H. Z. dos Santos, Adriano G. Fisch, Nilo S. M. Cardozo, Argimiro R. Secchi   +3 more
doaj   +1 more source

Preparation of Pincer Hafnium Complexes for Olefin Polymerization

Molecules, 2019
Pincer-type [Cnaphthyl, Npyridine, Namido]HfMe2 complex is a flagship among the post-metallocene catalysts. In this work, various pincer-type Hf-complexes were prepared for olefin polymerization.
Su Jin Kwon, Jun Won Baek, Hyun Ju Lee, Tae Jin Kim, Ji Yeon Ryu, Junseong Lee, Eun Ji Shin, Ki Soo Lee, Bun Yeoul Lee   +8 more
doaj   +1 more source

Polymerization kinetics of bicyclic olefins and mechanism with symmetrical ansa-metallocene catalysts associated with active center count: relationship between their activities and structure and activation path. [PDF]

RSC Adv, 2022
Ali A, Ali A, Naveed A, Shehzad K, Aziz T, Rasheed T, Moradian JM, Hassan M, Hassan M, Rahman A, Zhiqiang F, Guo L.   +11 more
europepmc   +1 more source

Mesoporous Ga-MCM-41: a very efficient support for the heterogenisation of metallocene catalysts

, 2013
Mesoporous Ga-containing silicates prepared by direct synthesis, Ga-MCM-41, are used in combination with metallocene Cp2ZrCl2 to provide very effective supported catalysts for ethylene polymerisation.
Ribeiro, M. R., Campos, João M., Lourenço, J. P., Fernandes, A.   +3 more
core  

Correlação entre propriedades reológicas e ópticas de filmes tubulares de polietileno linear de baixa densidade com diferentes distribuições de ramificações curtas Correlation between rheological and optical properties of LLDPE blown films with different distributions of short chain branching

Polímeros, 2006
Devido a suas excelentes propriedades mecânicas o polietileno linear de baixa densidade, PELBD, tem ganhado cada vez mais importância na indústria de embalagens.
Glayton M. Basso, Pedro I. Paulin-Filho, Rosario E. S. Bretas, Alessandro Bernardi   +3 more
doaj   +1 more source

Correction: Rapid kinetic evaluation of homogeneous single-site metallocene catalysts and cyclic diene: how do the catalytic activity, molecular weight, and diene incorporation rate of olefins affect each other? [PDF]

RSC Adv, 2021
Ali A, Nadeem M, Lu J, Moradian JM, Rasheed T, Aziz T, Maouche C, Guo Y, Awais M, Zhiqiang F, Guo L.   +10 more
europepmc   +1 more source

Growing chain isomerizations in metallocene-catalyzed Ziegler-Natta 1-alkene polymerization

, 1995
A no. of isomerization reactions of the growing polymer chain have been shown to compete with the process of 1-alkene polyinsertion promoted by Group 4 metallocene Ziegler-Natta catalysts.
CIPULLO, ROBERTA, BUSICO, VINCENZO
core   +1 more source