Integrated Effect of Comonomer and Catalyst on Copolymerization of Ethylene with Allylcyclopentane or Allylcyclohexane by Using Metallocene Catalysts

Wang, Wei; Hou, Liping; Zhang, Taoyi

doi:10.1002/slct.202001213

Cited by 6 publications

(3 citation statements)

References 31 publications

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“…The polymers produced by cat 1 had a higher molecular weight than the polymers produced by cat 2. For ethylene copolymerization, cat 2 always demonstrated a higher activity than cat 1 but provided the polymer with a lower molecular weight [30]. Here, the polymerization of 4M1P and ATMS showed the same behaviors as the ethylene polymerization, implying the intrinsic behaviors of these two catalysts, regardless of which monomer was involved.…”

Section: Resultsmentioning

confidence: 71%

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Polymerization of Allyltrimethylisilane and 4-Methyl-1-Pentene by Using Metallocene Catalysts

et al. 2023

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Polymers of higher olefin, obtained by Ziegler-type polymerization, have been used in some critical fields, e.g., as the membrane for extracorporeal membrane oxygenation (ECMO), which plays an important role in the treatment of patients with severe COVID-19. The polymer obtained by a single-site catalyst, e.g., metallocene catalysts, demonstrated a higher performance. The homo- and co-polymerization of allyltrimethylisilane (ATMS) and 4-methyl-1-pentene (4M1P) were conducted using syndiospecific (cat 1) and isospecific (cat 2) metallocene catalysts. Cat 1 showed low conversions and provided a polymer with a higher molecular weight, while cat 2 behaved oppositely. 13C-NMR spectra certified the stereotacticity of the resultant polymer, and the resonance of the carbon atom of CH2 (αα’) between the two tertiary carbon atoms of the ATMS and 4M1P units were observed. This could be the evidence of the formation of a true copolymer. The crystallization of the polymer was explored using a differential scanning calorimeter (DSC) and wide angle X-ray diffraction (WAXD). All homopolymers and some of the copolymers showed high melting temperatures and low melting enthalpies. The WAXD patterns of the syndiotactic polymer and isotactic homopolymer or the ATMS-rich copolymer were consistent with the reported literature, but the isotactic 4M1P-rich copolymer provided the crystal form I, which is unusual for a 4M1P polymer without any pretreatment.

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Section: Resultsmentioning

confidence: 71%

“…The copolymer (run 4) with a higher ATMS incorporation was obtained from the syndiospecific catalyst. For any copolymerization, if the bulkier monomer is regarded as the comonomer, it is reasonable to believe that cat 1 is a better catalyst than cat 2 if only the copolymerization is considered [30].…”

Section:   mentioning

confidence: 99%

Polymerization of Allyltrimethylisilane and 4-Methyl-1-Pentene by Using Metallocene Catalysts

et al. 2023

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“…The single‐site catalyst, including metallocene, holds the characteristics of high efficiency and universality when used for olefin copolymerization. [ 33 ] Therefore, it is possible to incorporate AIEgen into the polyolefin chain by using a single‐site catalyst system to obtain a polyolefin with the excellent comprehensive properties and AIE characteristics. The marriage of polyolefin and AIE will bring them more market opportunities.…”

Section: Introductionmentioning

confidence: 99%

An Olefin Copolymer with Aggregation‐Induced Emission Characteristics Synthesized by Using Metallocene Catalyst

Wang

Hou

et al. 2021

Macro Materials & Eng

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Copolymerization of ethylene with (2-(4-vinylphenyl)ethene-1,1,2-triyl) tribenzene is conducted by using a metallocene catalyst, giving an ethylene copolymer containing tetraphenylethene unit. The result of NMR shows that the tetraphenylethene unit is distributed in isolation in the polymer chain, and the melting point of the copolymer decreases linearly with the increase of the comonomer incorporation. The copolymer can emit blue fluorescence under ultraviolet light, and the intensity increases with the increase of the comonomer incorporation. The fluorescence of flakes made of the copolymer gradually becomes weaker when the temperature is raised. When the temperature is higher than the melting point of the copolymer, the fluorescence is almost invisible.

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The Third Compound Promoted Copolymerization of Ethylene with 4‐Penten‐1‐ol by Using Metallocene Catalyst

Wang,

Guo,

et al. 2024

Macro Chemistry & Physics

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Olefin coordination copolymerization with polar monomers is an important topic both in academia and industry. During copolymerization, polar monomers will seriously reduce the polymerization activity and the molecular weight of the copolymer, making it difficult to balance the two and the polar monomer incorporation at the same time. In this study, a metallocene catalyst, Ph2C(Cp)(Flu)ZrCl2, was used for the copolymerization of ethylene with 4‐penten‐1‐ol. The incorporation of 4‐penten‐1‐ol can be effectively increased by the introduction of the steric phenol as the third component. Depending on the cocatalyst, the activity or molecular weight can be improved. It is believed that the promotion effect may work by the interaction of the steric phenol with the catalyst or cocatalyst. It is also suggested that in this system, polymerization is terminated by deactivation‐chain transfer mechanism rather than β‐X elimination due to back‐biting.This article is protected by copyright. All rights reserved

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Integrated Effect of Comonomer and Catalyst on Copolymerization of Ethylene with Allylcyclopentane or Allylcyclohexane by Using Metallocene Catalysts

Cited by 6 publications

References 31 publications

Polymerization of Allyltrimethylisilane and 4-Methyl-1-Pentene by Using Metallocene Catalysts

Polymerization of Allyltrimethylisilane and 4-Methyl-1-Pentene by Using Metallocene Catalysts

An Olefin Copolymer with Aggregation‐Induced Emission Characteristics Synthesized by Using Metallocene Catalyst

The Third Compound Promoted Copolymerization of Ethylene with 4‐Penten‐1‐ol by Using Metallocene Catalyst

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