Article
Polymer Science
Fei Wang, Li Pan, Vladislav A. Tuskaev, Svetlana Ch. Gagieva, Yue-Sheng Li
Summary: This study develops a nickel-based catalyst for the efficient copolymerization of olefin with polar monomers, which has been a longstanding challenge in the field.
CHINESE JOURNAL OF POLYMER SCIENCE
(2023)
Article
Chemistry, Physical
Xu-ling Wang, Yan-ping Zhang, Fei Wang, Li Pan, Bin Wang, Yue-sheng Li
Summary: A series of methyl nickel complexes with phosphino-naphtholate chelate ligands have been designed and synthesized with high activity towards ethylene polymerization and ethylene/unsaturated acid ester copolymerization. These catalysts show outstanding catalytic activities, achieving high productivity in both ethylene polymerization and ethylene/methyl acrylate copolymerization.
Article
Chemistry, Physical
Yizhou Wang, Zheng Wang, Qiuyue Zhang, Song Zou, Yanping Ma, Gregory A. Solan, Wenjuan Zhang, Wen-Hua Sun
Summary: A new type of unsymmetrical quinoline compound has been synthesized and used as a template to prepare cobalt complexes with doubly fused structures. These cobalt complexes exhibit high activity and controllability in ethylene polymerization, with variations in molecular weight and dispersity.
Article
Chemistry, Multidisciplinary
Clement G. Collins Rice, Jean-Charles Buffet, Zoe R. Turner, Dermot O'Hare
Summary: Novel permethylindenyl-phenoxide (PHENI*) ansa-metallocene titanium complexes immobilized on solid supports show high catalytic activity for slurry-phase ethylene polymerization, producing substantially disentangled polyethylene with a weight-average molecular weight of 3.4 MDa.
CHEMICAL COMMUNICATIONS
(2021)
Article
Engineering, Chemical
Shaomeng Zhang, Chunpeng Cao, Wensi Guo, Yuan Zhang, Min Sun, Wei Yang, Lei He, Qigu Huang
Summary: By improving the mononuclear [Me2Si(C5H4)(2)]TiCl2 catalyst, a binuclear Ti olefin polymerization catalyst, complex 1,4-phenoxy{[Me2Si(C5H4)(2)]TiCl}(2) (Complex 2) was synthesized. Complex 2 showed superior thermal stability and higher activity for ethylene polymerization due to the addition of the phenoxy group, which provided a denser coordination environment and increased the molecular weight of the polymer.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Fuxing Shi, Xiaochuan Ren, Haohao Wang, Min Pu, Li Liu, Ming Lei
Summary: In this study, the density functional theory method was used to investigate the copolymerization reaction of ethylene and 2-methoxystyrene catalyzed by a palladium phosphine-sulfonate complex. The results revealed insights into the reaction mechanism and pathway selection at different stages.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Polymer Science
Pei Li, Hongju Liu, Wanlu Tian, Zhanshan Ma, Xiaoyue Wang, Guoyong Xu, Chao Li, Muhammad Qasim, Fuzhou Wang
Summary: Improvement of amide derived catalysts used in olefin polymerization was achieved by synthesizing cationic nickel catalysts with steric and electronic factors variation. These bulky nickel catalysts showed significantly higher activity and thermal stability compared to previous open pyridine carboxamidate nickel catalysts. They produced higher molecular weight semi-crystalline polyethylene with tunable branching densities and melting points. Additionally, they also promoted the copolymerization of ethylene and methyl 10-undecenoate to yield functionalized polyethylenes with high incorporation rate of MU.
Article
Chemistry, Inorganic & Nuclear
Deepika Sahil, Ramalingam Thirumoorthi, Chandrakanta Dash
Summary: In this study, a copper(I)-bis(imino)pyridine-triphenylphosphine complex was successfully synthesized and characterized using various analysis methods. The complex exhibited a distorted tetrahedral geometry and was proven to be an effective catalyst for a one-pot multicomponent Click reaction in methanol, resulting in the synthesis of several 1,4-disubstituted 1,2,3-triazoles.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Polymer Science
Zhen Zhang, Yang Jiang, Kai Zhang, Zhong-Yi Cai, Shi-Hui Li, Dong-Mei Cui
Summary: The catalytic performance of rare-earth metal dialkyl complexes in combination with DMAO for styrene polymerization was investigated, with certain complexes showing high catalytic activity and selectivity. Moreover, the system was found to be effective for the polymerization of other styrene derivatives and the copolymerization of ethylene and styrene.
CHINESE JOURNAL OF POLYMER SCIENCE
(2021)
Article
Polymer Science
Yi Yan, Shi-Fang Yuan, Ming Liu, Gregory A. Solan, Yan-Ping Ma, Tong-Ling Liang, Wen-Hua Sun
Summary: A group of five bis(arylimino)pyridine-cobalt(II) chloride complexes were synthesized and showed high activity in ethylene polymerization.
CHINESE JOURNAL OF POLYMER SCIENCE
(2022)
Article
Chemistry, Physical
Muhammad Zada, Desalegn Demise Sage, Qiuyue Zhang, Yanping Ma, Gregory A. A. Solan, Yang Sun, Wen-Hua Sun
Summary: A series of cobalt complexes containing N-2,4-bis(dibenzosuberyl)-6-fluorophenyl groups were synthesized and found to exhibit high catalytic activity and thermal stability in ethylene polymerization.
Article
Multidisciplinary Sciences
Chen Zou, Guifu Si, Changle Chen
Summary: The authors present an ionic anchoring support strategy that allows the heterogenization of homogeneous metal complexes on solid supports. This strategy is highly versatile and enables strong catalyst-support interactions while tolerating various polar functional groups. The supported catalysts showed improved polymerization properties and higher comonomer incorporation compared to their unsupported counterparts.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
S. Olivia Gunther, Qingheng Lai, Todd Senecal, Rafael Huacuja, Sean Bremer, David M. Pearson, Jessica C. DeMott, Nattamai Bhuvanesh, Oleg Ozerov, Jerzy Klosin
Summary: By preparing and evaluating various carborane salts as activators, it was found that activators based on undecachloro carboranes led to highly active catalysts, while other activators were inactive under specific conditions. Polymer samples obtained from different catalysts showed similar performance, indicating that carborane anions do not influence catalyst kinetics.
Review
Chemistry, Multidisciplinary
Wasim Ullah Khan, Hassam Mazhar, Farrukh Shehzad, Mamdouh A. Al-Harthi
Summary: The synthesis of polar functionalized polyolefin (PFP) improves mixing properties, polymer surface, and rheological properties for upgraded polyolefins. Metal-based catalyzed olefin copolymerization with polar comonomers offers an energy-efficient and upfront methodology, with late transition metal-based catalysts making progress in recent years. The development of nickel-based catalysts for PFP synthesis has shown rigorous progress in the past half-decade. This review summarizes the research trends in both early and late transition metal-based catalyst development and highlights the influence of transition metal-based catalysts on polymer properties.
Article
Polymer Science
Ignacio Perez-Ortega, Ana C. Albeniz
Summary: In this study, it was found that benzylic palladium complexes are suitable precatalysts for the challenging vinylic addition polymerization of 5-vinyl-2-norbornene (VNB). A highly active catalyst can be formed with a mixture of [Pd-2(mu-Br)(2)(eta(3)-C6H5CHCH2C6F5)(2)], PCy3 and NaBAr4F, resulting in high molecular weight polymers of VNB with preserved exocyclic pendant double bonds. The nature of the counterion, with BAr4F- being the most efficient among several tested, plays a crucial role in the propagation of the polymerization process.
