Metallocene encapsulated within a hybrid silica-polystyrene support

Heck, Cesar A.; Stedile, Fernanda Chiarello; Santos, João Henrique Zimnoch dos

doi:10.1007/s13726-021-00906-z

Cited by 2 publications

(1 citation statement)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Metallocene catalysts, also known as cyclopentadienyl transition metal complex catalysts, refer to metal complex precursors composed of ligands containing at least one η 5 -cyclopentadienyl derivative and a transition metal (or RE metal). Compared with traditional Ziegler-Natta olefin polymerization catalysts, metallocene catalysts have only one single active center and the metal atoms in the active centers are generally confined in a space-restricted environment, allowing only monomers to coordinate to the active site of the catalyst and accurately controlling the monomer coordination orientation, thereby controlling the relative molecular weight, molecular weight distribution, stereoregularity, and crystalline structure of the polymers [40][41][42][43].…”

Section: Mono-cp' Metallocene Catalyst Characteristicsmentioning

confidence: 99%

High-Efficiency Mono-Cyclopentadienyl Titanium and Rare-Earth Metal Catalysts for the Production of Syndiotactic Polystyrene

Wen,

Hu,

Kang

et al. 2023

Molecules

View full text Add to dashboard Cite

Syndiotactic polystyrene (SPS) refers to a type of thermoplastic material with phenyl substituents that are alternately chirally attached on both sides of an aliphatic macromolecular main chain. Owing to its excellent physical and mechanical properties, as well as its chemical stability, high transparency, and electrical insulation characteristics, SPS is used in a wide variety of technical fields. SPS is commonly produced via the stereoselective transition metal-catalyzed coordination polymerization method mediated by stereospecific catalysts, which consists of anionic mono-cyclopentadienyl derivative η5-coordinated single active metal centers (referred to as “mono-Cp’-M”), with active center metals involving Group 4 transition metals (with an emphasis on titanium) and rare-earth (RE) metals of the periodic table. In this context, the use of mono-cyclopentadienyl titanocene (mono-Cp’Ti) catalysts and mono-cyclopentadienyl rare-earth metal (mono-Cp’RE) metallocene catalysts for the syndiospecific polymerization of styrene is discussed. The effects of the mono-cyclopentadienyl ligand structure, cationic active metal types, and cocatalysts on the activity and syndiospecificity of mono-Cp’ metallocene catalysts are briefly surveyed.

show abstract

Section: Mono-cp' Metallocene Catalyst Characteristicsmentioning

confidence: 99%