Half-metallocene zirconium complex bearing tridentate [N,N,O] ligand and its use in homo- and copolymerization of ethylene

Bergamo, Adão L.; Chagas, Rafael Pavão das; Casagrande, Osvaldo L.

doi:10.1016/j.catcom.2013.08.016

Cited by 4 publications

(1 citation statement)

References 35 publications

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“…The α-olefin comonomer effect was clearly observed during the process of ethylene/1-hexene copolymerization, as the copolymerization activities increased obviously in the presence of 1-hexene, compared with the ethylene homopolymerization results [32]. Gel permeation chromatographic (GPC) analysis revealed that the molecular weights of ethylene/1-hexene copolymer decreased from about 200,000 to 110,000 compared to ethylene homopolymer, and similar results were also reported for ethylene/α-olefin copolymers with other single-site catalyst systems [34,35]. The introduction of 1-hexene affects the catalytic activities and molecular chain length in different ways.…”

Section: Chain Growth Of Ethylene/1-hexene Copolymersupporting

confidence: 67%

Porous Organic Polymers-Supported Metallocene Catalysts for Ethylene/1-Hexene Copolymerization

et al. 2018

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Porous organic polymers (POPs) have received much attention in adsorption, separation, and catalysis. In this paper, porous organic polymers with different pore structure were used as metallocene catalyst supports, and ethylene/1-hexene copolymerizations were conducted using the POPs-supported metallocene catalyst. The pore structure of the prepared POPs and the supported metallocene catalyst were characterized by nitrogen sorption porosimetry and non-local density functional theory simulation, and the molecular chain structure of the produced ethylene/1-hexene copolymers were investigated through gel permeation chromatography (GPC), IR analysis, differential scanning calorimetry (DSC), and temperature rising elution fractionation (TREF). The results show that the loading amount of active sites varied with different pore structures of the POP supports, and the active species scattered in different pore sizes had a moderate impact on the molecular chain growth and the molecular weight distribution. The IR, DSC, and TREF analysis revealedthat different branching degree, double bond content, and chemical composition distributions were detected from the molecular chain structure of the ethylene/α-olefin copolymers from different POPs and silica-supported metallocene catalysts, despite their similar IR, DSC, and TREF curves due to the same active species. Scanning electron microscopy (SEM) showed that porous ethylene/α-olefin copolymers with varied surface morphology were obtained from the POPs-supported metallocene catalysts with different pore structure.

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Section: Chain Growth Of Ethylene/1-hexene Copolymersupporting

confidence: 67%