Results 1 to 10 of about 5,339 (237)

Synthesis of High-Molecular-Weight Branched Polyethylene Using a Hybrid “Sandwich” Pyridine-Imine Ni(II) Catalyst

Frontiers in Chemistry, 2022
Most pyridine-imine Ni(II) and Pd(II) catalysts tend to yield low-molecular-weight polyethylene and ethylene-based copolymers in olefin insertion polymerization, as the unilateral axial steric structure of such complexes often cannot provide effective ...
You Ge, You Ge, Qi Cai, Yuyin Wang, Jiangang Gao, Yue Chi, Shengyu Dai, Shengyu Dai   +7 more
doaj   +1 more source

Six-coordinated half-metallocene catalyst for ethylene polymerization and its mechanism study

Giant
The demand for catalysts capable of enabling olefin polymerization at elevated temperatures to meet industrial requirements continues to grow. Among emerging candidates, novel six-coordinated half-metallocene catalysts, which combine the advantages of ...
Qian Li, Zifang Guo, Shuzhang Qu, Xinwei Li, Jian Chen, Yiming Wei, Cui Zheng, Zhihui Song, Yue Lan, Zhao Wen, Chaofan Yu   +10 more
doaj   +1 more source

Copolymerization of ethylene with α-olefins over highly active supported Ziegler-Natta catalyst with vanadium active component [PDF]

Polyolefins Journal, 2019
The new highly active supported vanadium-magnesium catalyst (VMC) has been studied in α-olefin (1-butene, 1-hexene)/ ethylene copolymerization in the presence of hydrogen.
Zenghui Zhao, Tatiana Mikenas, Vladimir Aleksandrovich Zakharov, Marina Nikolaeva, Mikhail Matsko, Elena Bessudnova, Wei Wu   +6 more
doaj   +1 more source

Modelling the catalyst fragmentation pattern in relation to molecular properties and particle overheating in olefin polymerization [PDF]

Polyolefins Journal, 2014
A two-dimensional single particle finite element model was used to examine the effects of particle fragmental pattern on the average molecular weights, polymerization rate and particle overheating in heterogeneous Ziegler-Natta olefin polymerization.
Mohsen Najafi, Mahmoud Parvazinia, Mir Hamid Reza Ghoreishy   +2 more
doaj   +1 more source

Recent Advancements in the Synthesis of Functional Polyolefins by Non-Bridged Half-Titanocenes

Molecules
Polyolefins are used widely due to their benefits such as being lightweight, chemical inertness, low cost, tunable properties, and easy processability. However, their nonpolar nature significantly limits their high-end applications.
Yanjun Chen, Haiqian Dong
doaj   +1 more source

Polimerização de estireno utilizando compostos organolantanídeos ativados por MAO

Química Nova, 2006
In an attempt to improve the performance of organolanthanide catalysts we investigated the use of the industrially important cocatalyst methylaluminoxane (MAO) to activate organolanthanide compounds in olefin polymerization. The catalytic systems LnBrCp2(
Alessandra de Souza Maia, Josué Garcia Quini, Renata Diana Miotti, Wanda de Oliveira   +3 more
doaj   +1 more source

Studies on chain shuttling polymerization reaction of nonbridged half-titanocene and bis(phenoxy-imine) Zr binary catalyst system [PDF]

Royal Society Open Science, 2019
In this contribution, olefin block copolymers were produced via chain shuttling polymerization (CSP), using a new combination of catalysts and a chain shuttling agent (CSA) diethylzinc (ZnEt2).
Qinwen Xu, Rong Gao, Dongbing Liu
doaj   +1 more source

"Effects of different vulcanization systems on properties of bio-based poly（di-n-butyl itaconate-co-butadiene) rubber"

Hecheng xiangjiao gongye
The effects of conventional vulcanization （CV) system, semi-effective vulcanization （SEV) system, effective vulcanization （EV) system, peroxide 1,3-bis（tert-butylperoxyisopropyl) benzene （BIBP)/triallyl isocyanurate （TAIC) vulcanization system, and ...
HAN Ju1,2, HAO Fu-lan1,2, ZHAO Chun-cai1,2, NIU Chun-liang1,2, ZHENG Hong-bing1,2
doaj   +1 more source

Late Transition Metal Olefin Polymerization Catalysts Derived from 8-Arylnaphthylamines

Inorganics
Late transition metal catalysts represent a significant class of olefin polymerization catalysts that have played an essential role in advancing the polyolefin industry owing to their highly tunable ligands and low oxophilicity.
Zonglin Qiu, Wenyan Wang, Handou Zheng, Dengfei Wang, Xinglong Zhao, Guangshui Tu, Jiahao Yang, Haiyang Gao   +7 more
doaj   +1 more source

Observation of Different Catalytic Activity of Various 1-Olefins during Ethylene/1-Olefin Copolymerization with Homogeneous Metallocene Catalysts

Molecules, 2011
This research aimed to investigate the copolymerization of ethylene and various 1-olefins. The comonomer lengths were varied from 1-hexene (1-C6) up to 1-octadecene (1-C18) in order to study the effect of comonomer chain length on the activity and ...
Mingkwan Wannaborworn, Bunjerd Jongsomjit, Piyasan Praserthdam   +2 more
doaj   +1 more source