Control of the molecular structure of ethylene-1-hexene copolymer by surface functionalization of SBA-15 with different compositions of amine groups

Lee, Jeong Suk; Ko, Young Soo

doi:10.1016/j.molcata.2014.01.015

Cited by 10 publications

(5 citation statements)

References 17 publications

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“…[7] Polymerization catalysis can be influenced by the concentration of surface silanols (which can be tuned via calcination) [10] or by functionalization of the surface with organic molecules introduced by reaction with surface silanols. [11][12][13] The influence of the support on the catalyst behavior, has instead been demonstrated by comparing distinct inorganic supports such as silica and alumina. [14] A systematic investigation of the influence of the support on these catalysts, therefore potentially offers an additional route to tuning the polymerisation behaviour of these catalysts.…”

mentioning

confidence: 99%

Controlling the activity of an immobilised molecular catalyst by Lewis acidity tuning of the support

Kenyon

Leung

Lyu

et al. 2021

Journal of Catalysis

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mentioning

confidence: 99%

Controlling the activity of an immobilised molecular catalyst by Lewis acidity tuning of the support

Kenyon

Leung

Lyu

et al. 2021

Journal of Catalysis

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“…Percentage norbornene incorporated in the polymer chain is in the range of 3.6-35.3 mol%. Incorporation increases almost linearly with increase of the initial NB concentration feed and is 11,20). This indicates that NB incorporation is rather independent on the catalyst structure [9].…”

Section: Copolymerization Of Ethylene With Norbornenementioning

confidence: 85%

Copolymerization of ethylene with norbornene or 1-octene using supported ionic liquid systems

Ochędzan‐Siodłak

Bihun

2016

Polym. Bull.

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Copolymerization of ethylene with norbornene (E/NB) and ethylene with 1-octene (E/Oct) is performed using supported ionic liquid (SIL) systems, in which metallocene (Cp 2 VCl 2 ) or post-metallocene [VCl 2 (salenCl 2 )] vanadium catalysts are immobilized in pyridinium chloroaluminate ionic liquid supported on silica. The studied SIL catalysts show higher activities as well as stability than their nonsupported analogues. In addition, higher activities and better comonomer incorporation are observed for norbornene (above 30 mol%). The comonomer incorporation has considerable influence on copolymer molecular weight (M w ), melting temperature, crystallinity degree, and microstructure of the copolymers. Molecularweight distribution is relatively narrow (1.5 B M w /M n B 3.0), which indicates the presence of single-site catalyst systems.

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“…It was observed that the specific surface did not change after the calcination or after the fixation of the complexes C1 and C2 on its surface, due to the low impregnated content. However, pore size and diameter decreased after calcination treatment and decreased further with catalyst immobilization [16]. The decrease in these values indicates that the catalyst anchorage in the carrier was successful [17].…”

Section: Important Aspects From the Supported Catalystmentioning

confidence: 96%

Evaluation of Bis(imino)pyridine Iron Catalyst on Heterogeneous Ethylene Polymerization

Cordeiro¹,

Marques²

2020

Ch&Cht

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This work deals with synthesis, characterization and evaluation of post-metallocene complexes based on silica-supported bis(imino)pyridine iron, containing amino groups in ethylene polymerizations. The reaction of these complexes and methylaluminoxane generated active species in heterogeneous ethylene polymerization. The absence of substituents at the orthoposition of the phenyl rings near the metal site was not compensated by the steric hindrance of the silica surface, negatively affecting the catalytic activity and the molar mass of the produced polymer. The catalyst C1, with the most bulkier ligand, presented the best performance, showing high catalytic activity not only in homogeneous system, but also in supported systems due to the chemical bond between the functionalized complex and the support surface, which led to polyethylene particles with good morphology, spherical tendency, filled pores and the decrease in bulk density compared to the particles produced through homogeneous catalyst.

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Control of the molecular structure of ethylene-1-hexene copolymer by surface functionalization of SBA-15 with different compositions of amine groups

Cited by 10 publications

References 17 publications

Controlling the activity of an immobilised molecular catalyst by Lewis acidity tuning of the support

Controlling the activity of an immobilised molecular catalyst by Lewis acidity tuning of the support

Copolymerization of ethylene with norbornene or 1-octene using supported ionic liquid systems

Evaluation of Bis(imino)pyridine Iron Catalyst on Heterogeneous Ethylene Polymerization

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