Post‐Metallocene in der industriellen Polyolefinproduktion

Baier, Moritz C.; Zuideveld, Martin A.; Mecking, Stefan

doi:10.1002/ange.201400799

Cited by 57 publications

(3 citation statements)

References 227 publications

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“…For Figure 1, polymerization time dependence studies at 150 °C showed that these hafnium catalysts exhibited outstanding thermal stability. Especially, Hf‐3 remained active in polymerization within 2 h. The high polymerization temperature and the aliphatic hydrocarbon solvents make this system potentially amenable for industrial solution phase polymerization processes [40–43] …”

Section: Resultsmentioning

confidence: 99%

Bidentate Pyridyl‐Amido Hafnium Catalysts for Copolymerization of Ethylene with 1‐Octene and Norbornene

et al. 2022

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Polyolefin elastomers (POEs) and cyclic olefin copolymers (COCs) are high-performance polyolefin materials of wide interest. It is crucial to develop low-cost and high-performance transition metal catalysts to prepare these polyolefin materials. In this contribution, we designed and synthesized a series of bidentate pyridyl-amido hafnium catalysts and used them in ethylene polymerization and copolymerization with comonomers including 1-octene and norbornene. These catalysts exhibited high activities of up to 16.3 × 10 6 g mol À 1 h À 1 and produced polyethylene with a high molecular weight of up to 24.5 × 10 4 g mol À 1 in ethylene polymerization at 150 °C. More importantly, these catalysts produced ethylene/1-octene copolymers with incorporation of up to 13.7 mol % and molecular weight of up to 72.7 × 10 4 g mol À 1 , and prepared ethylene/ norbornene copolymers with incorporation of up to 50.3 mol %, along with glass transition temperature of up to 184.3 °C and molecular weight of up to 187.6 × 10 4 g mol À 1 . The ease of synthesis, high versatility and great copolymerization properties of these hafnium catalysts make them highly attractive for future studies.

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Section: Resultsmentioning

confidence: 99%

Bidentate Pyridyl‐Amido Hafnium Catalysts for Copolymerization of Ethylene with 1‐Octene and Norbornene

et al. 2022

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“…The petroleum industry is the main source of ethylene and α‐olefins. After Ziegler discovered a transition metal‐based catalyst for ethylene polymerization and Natta discovered polymerization of stereoselective propylene, [2,3] a rapid increase in research studies has been observed in this area [2,4–11] . However, the application of these materials is limited due to the fact that they offer poor surface properties associated with their non‐polar nature [12–15] .…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Transition Metal‐Based Catalysts for Ethylene Copolymerization with Polar Comonomer

Khan

Mazhar

Shehzad

et al. 2023

The Chemical Record

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The synthesis of polar functionalized polyolefin (PFP) offers improvement in mixing properties, polymer surface, and rheological properties with the potential of upgraded polyolefins for modern and ingenious applications. The synthesis of PFP from metal-based catalyzed olefin (non-polar in nature) copolymerization with polar comonomers embodies energy-efficient, atomefficient, and apparently an upfront methodology. Despite their outstanding success during conventional polymerization of olefin, 3 rd and 4 th group (early transition metal)-based catalysts, owing to their electrophilic nature, face challenges mainly due to Lewis basic sites of the polar monomers. On the contrary, late transition metal-based catalysts have also made progress, in recent years, for PFP synthesis. The recent past has also witnessed several advancements in the development of dominating palladium-based catalysts while their lower resistance towards ligand functional groups has limited the practical application of abundant and cheaper nickel-based catalysts. However, the relentless efforts of the scientific community, during the past half-decade, have indicated rigorous progress in the development of nickel-based catalysts for PFP synthesis. In this review, we have abridged the recent research trends in both early as well as late transition metal-based catalyst development. Furthermore, we have highlighted the role of transition metalbased catalysts in influencing the polymer properties.

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“… [8–10] This route has achieved great success in early transition metal catalytic systems such as metallocene for the preparation of uniformly dispersed polyolefin composites [11–15] . Generally, the fillers are pretreated with cocatalysts such as methylaluminoxane (MAO), which can activate metal catalysts and heterogenize them by the formation of ion pairs (Figure 1C, left) [16–21] …”

Section: Introductionmentioning

confidence: 99%

Outer‐Shell Self‐Supported Nickel Catalysts for the Synthesis of Polyolefin Composites

Peng

Tan

et al. 2023

Angewandte Chemie

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In situ heterogeneous olefin polymerization has attracted much attention for the synthesis of polyolefin composites. However, the complicated syntheses of specially designed catalysts or the detrimental effects of interactions between catalyst and solid supports pose great challenges. In this contribution, an outer‐shell self‐supporting strategy was designed to heterogenize nickel catalysts on different fillers via precipitation homopolymerization of ionic cluster type polar monomer. These catalysts demonstrated high activity, good product morphology control, and stable performances in ethylene polymerization and copolymerization. Moreover, various polyolefin composites with great mechanical and customized properties can be efficiently synthesized.

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Post‐Metallocene in der industriellen Polyolefinproduktion

Cited by 57 publications

References 227 publications

Bidentate Pyridyl‐Amido Hafnium Catalysts for Copolymerization of Ethylene with 1‐Octene and Norbornene

Bidentate Pyridyl‐Amido Hafnium Catalysts for Copolymerization of Ethylene with 1‐Octene and Norbornene

Recent Advances in Transition Metal‐Based Catalysts for Ethylene Copolymerization with Polar Comonomer

Outer‐Shell Self‐Supported Nickel Catalysts for the Synthesis of Polyolefin Composites

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