Structural evolution of iminopyridine support for nickel/palladium catalysts in ethylene (oligo)polymerization

Mahmood, Qaiser; Li, Xiaoxu; Qin, Lidong; Wang, Luyao; Sun, Wen‐Hua

doi:10.1039/d2dt02251f

Cited by 51 publications

(42 citation statements)

References 149 publications

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“…It is chemically inert, corrosion resistant, non-toxic, recyclable and reprocessable [ 2 ]. High-density, low-density and linear low-density polyethylene is used in a wide range of life applications such as toys, bottles, water tanks, shopping bags, construction tools and disposable cups, as well as consumer products in electronics and medical fields [ 3 ]. All kinds of abandoned plastic products are exposed to the natural environment, forming plastic particles of different sizes which seriously pollute water resources and pose a serious threat to aquatic and Marine life [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Screening of Polyethylene-Degrading Bacteria from Rhyzopertha Dominica and Evaluation of Its Key Enzymes Degrading Polyethylene

et al. 2022

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Polyethylene (PE) is widely used, and it has caused serious environmental problems due to its difficult degradation. At present, the mechanism of PE degradation by microorganisms is not clear, and the related enzymes of PE degradation need to be further explored. In this study, Acinetobacter baumannii Rd-H2 was obtained from Rhizopertha dominica, which had certain degradation effect on PE plastic. The degradation performance of the strains was evaluated by weight loss rate, SEM, ATR/FTIR, WCA, and GPC. The multi-copper oxidase gene abMco, which may be one of the key genes for PE degradation, was analyzed and successfully expressed in E. coli. The laccase activity of the gene was determined, and the enzyme activity was up to 159.82 U/L. The optimum temperature and pH of the enzyme are 45 °C and 4.5 respectively. It shows good stability at 30–45 °C. Cu2+ can activate the enzyme. The abMCO was used to degrade polyethylene film, showing a good degradation effect, proving that the enzyme could be the key to degrading PE.

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Section: Introductionmentioning

confidence: 99%

Screening of Polyethylene-Degrading Bacteria from Rhyzopertha Dominica and Evaluation of Its Key Enzymes Degrading Polyethylene

et al. 2022

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“…As a derivative of iminopyridine ligands, 8-anilide-5,6,7-trihydroquinoline ligands have gradually attracted people's attention. 43,44 Ni complexes bearing 8-anilide-5,6,7-trihydroquinoline ligands were reported by Sun's group, and these Ni complexes displayed excellent activity for ethylene polymerization and produced highly branched polymers. 45 Liu and coworkers synthesized several Al complexes bearing analogous ligands, and these Al complexes displayed high activity toward the ring-opening polymerization of cyclic esters.…”

Section: Introductionmentioning

confidence: 99%

Vanadium complexes bearing 8-anilide-5,6,7-trihydroquinoline ligands for ethylene (co-)polymerization

Niu

Zhu

et al. 2023

Dalton Trans.

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“…The type of catalytic system affects key properties of polymer products such as the microstructure, crystallinity, glass transition temperature, molecular weight characteristics, thermal, and mechanical quality. [ 1 , 2 , 6 , 7 ]. The most effective and modern precatalysts are metallocenes and post-metallocenes activated by methylalumoxane (MAO).…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Ethylene/propylene and Ethylene/propylene/5-ethylidene-2-norbornene Copolymers Obtained on Rac-Et(2-MeInd)2ZrMe2/Isobutylaluminium Aryloxide Catalytic Systems

et al. 2023

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Ethylene/propylene (E/P) and ethylene/propylene/5-ethylidene-2-norbornene (E/P/ENB) copolymers were obtained on rac-Et(2-MeInd)2ZrMe2 activated by a number of isobutylaluminium aryloxides: (2,6-tBu2PhO-)AliBu2 (1-DTBP) (2,6-tBu2,4-Me-PhO-)AliBu2 (1-BHT), (2,4,6-tBu2PhO-)AliBu2 (1-TTBP), (2,6-tBu2,4-Me-PhO-)2AliBu (2-BHT), (2,6-tBu2PhO-)2AliBu (2-DTBP), [(2-Me,6-tBu-C6H3O)AliBu2]2 (1-MTBP), [(2,6-Ph2-PhO)AliBu2]2 (1-DPP). This study shows how the structure of an activator influences catalytic activity and polymer properties, such as the copolymer composition, molecular weight characteristics, and thermophysical and mechanical properties. It has been shown that both the introduction of a bulky substituent in the para-position of the aryloxy group and the additional aryloxy group in the structure of an activator lead to a significant decrease in activity of the catalytic system in all studied copolymerization processes. Moreover, activation by bulkier aryloxides leads to lower levels of comonomer insertion and gives rise to higher molecular weight polymers. Broad or multiple endothermic peaks with different values of melting points are observed on the DSC curves of the copolymers obtained with different catalytic systems. The DSC of the thermally fractionated samples makes it possible to reveal the heterogeneity of the copolymer microstructure, which manifests itself in the presence of a set of lamellar crystallites of different thickness. The results also present the mechanical properties of the copolymers, such as the tensile strength (σ), elongation at break (ε), and engineering strain (EL). The synthesized E/P and E/P/ENB copolymers contain about 1–4 wt.% of the sterically hindered phenols obtained in situ as a residue of the hydrolyzed activators in the course of reaction quenching. This determines the increased thermooxidative stability of the copolymers.

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Structural evolution of iminopyridine support for nickel/palladium catalysts in ethylene (oligo)polymerization

Abstract: The interest in the late transition metal catalysts based design of new architectures of polyethylene (PE) has continuously been growing over the years. The structure of these catalysts is predominantly...

Cited by 51 publications

References 149 publications

Screening of Polyethylene-Degrading Bacteria from Rhyzopertha Dominica and Evaluation of Its Key Enzymes Degrading Polyethylene

Screening of Polyethylene-Degrading Bacteria from Rhyzopertha Dominica and Evaluation of Its Key Enzymes Degrading Polyethylene

Vanadium complexes bearing 8-anilide-5,6,7-trihydroquinoline ligands for ethylene (co-)polymerization

Synthesis and Properties of Ethylene/propylene and Ethylene/propylene/5-ethylidene-2-norbornene Copolymers Obtained on Rac-Et(2-MeInd)2ZrMe2/Isobutylaluminium Aryloxide Catalytic Systems

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