The Canadian Journal of Chemical Engineering, Journal Year: 2023, Volume and Issue: 101(9), P. 4800 - 4803
Published: May 19, 2023
Data sharing is not applicable to this article as no new data were created or analyzed in study.
Language: Английский
Applied Organometallic Chemistry, Journal Year: 2024, Volume and Issue: 38(4)
Published: Feb. 18, 2024
The properties and practical applications of polyethylene are closely associated with the polymer molecular weight, polydispersity, degree branching, type branches its arrangement within microstructure. In this study, a set structurally diverse unsymmetrical 1‐(2,6‐dibenzhydryl‐4‐hydroxylphenylimino)‐2‐(2,6‐(R)‐4‐(R 1 )phenylimino)acenaphthene‐nickel dibromide precatalysts (where Ni 2Me [R = Me, R H], 2Et Et, 2iPr iPr, 3Me [R, Me], 2Et,Me Me]) has been prepared studied for ethylene polymerization. Molecular structure analysis complexes revealed distorted tetrahedral geometries at nickel. polymerization activities extremely high all upon activation either EASC or MMAO aluminum reagents, trend notably pronounced in case EASC‐activated systems, entering activity range 10 million g mol −1 h 30°C. demonstrated exceptional performance higher temperatures, achieving an 2.4 × 6 100°C generated weight ( M w 5 ) narrow dispersity across reaction temperatures Ð ≈ 1.5). High temperature 13 C NMR spectra identified 97–142/1000C resulting polyethylene, feature significantly dependent on temperature. terms mechanical properties, stress–strain indicated that synthesized lower displayed superior tensile strength compared produced while reverse was observed strain recovery analysis. (up to 72%) these highlights characteristic thermoplastic elastomers.
Language: Английский
Citations
6
Applied Catalysis A General, Journal Year: 2024, Volume and Issue: 691, P. 120069 - 120069
Published: Dec. 11, 2024
Language: Английский
Citations
5
Chem Catalysis, Journal Year: 2025, Volume and Issue: 5(1), P. 101240 - 101240
Published: Jan. 1, 2025
Language: Английский
Citations
0
Chemical Science, Journal Year: 2024, Volume and Issue: 15(24), P. 9353 - 9360
Published: Jan. 1, 2024
An expedient synthesis of electron-deficient styrenes is accomplished through decarboxylation and oxidation via halogen ion transfer. The resulting umpoled intermediates undergo a rebound elimination to furnish olefins.
Language: Английский
Citations
3
Materials, Journal Year: 2025, Volume and Issue: 18(6), P. 1334 - 1334
Published: March 18, 2025
Despite the great successes achieved by metallocene catalysts in high-value-added polyolefin elastomer, challenging preparation conditions and undesirable high-temperature molecular weight capabilities have compromised efficiency cost of industrial production. Recently, non-metallocene received considerable attention due to their high thermostability, especially when coordinated with early transition metals. This review provides an overview these metal catalysts, which are mainly composed N,N′-, N,O-, N,S-bidentate complexes tridentate complexes. The structural characteristics, catalytic performance, advantages, disadvantages relevant as well applications, discussed. Candidates for commercialization proposed—focusing on imine-enamine, amino-quinoline, pyridine-imine catalysts—by comparing successful industrialization cases catalysts. Finally, trend research strategies address challenges limiting considered.
Language: Английский
Citations
0
Energy & Fuels, Journal Year: 2025, Volume and Issue: unknown
Published: April 2, 2025
Language: Английский
Citations
0
Polymers, Journal Year: 2024, Volume and Issue: 16(7), P. 902 - 902
Published: March 25, 2024
A family of titanium complexes (Ti1–Ti7) with the general formula LTiCl3, supported by tridentate phenoxyimine [O−NO] ligands (L1–L7) bearing bulky sidearms, were synthesized treating corresponding stoichiometric amount TiCl4. All and well characterized 1H 13C NMR spectroscopies, in which ortho- methoxyl groups on N-aryl moieties shifted to downfield, corroborating successful coordination reaction. Structural optimization DFT calculations revealed that one phenyl dibenzhydryl moiety could form π-π stacking interaction salicylaldimine plane, because obtained good thermal stabilities for high-temperature polymerization ethylene. The robustness was closely related strength interactions, mainly influenced substituents moieties; Ti1, Ti4 Ti5 emerged as three best-performing at 110 °C. With aid such also found be active >150 °C, although decreased activities witnessed. Besides homopolymerizations, Ti1–Ti7 copolymerization ethylene 1-octene, but medium incorporation percentage, demonstrating their capabilities.
Language: Английский
Citations
1
Polymers, Journal Year: 2024, Volume and Issue: 16(3), P. 387 - 387
Published: Jan. 30, 2024
A series of ethylene/1-octene copolymers synthesized with diamine-bis(phenolate) complexes activated Al(iBu)3/[Ph3C][B(C6F5)4] were subjected to preparative temperature rising elution fractionation (TREF). The used differed in the type metallic center (Zr or Ti) amine donor pendant arm ligand (NMe2 NiPr2). obtained fractions then characterized via FTIR, DSC and GPC methods. It was found that all had very broad chemical composition distributions, most heterogeneous copolymer produced by titanium complex bearing a NiPr2 group. difference comonomer incorporation into macromolecules as high 8.3 mol%. melting molecular weight changed nearly linearly increased temperature. Copolymers zirconium catalysts also fractionated using solvent/non-solvent technique subsequent analysis fractions. shown have similar composition, low distribution distribution. Therefore, content not function observed for Ziegler–Natta catalysts.
Language: Английский
Citations
0
Published: Jan. 1, 2024
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Language: Английский
Citations
0
Polymer, Journal Year: 2024, Volume and Issue: 300, P. 126997 - 126997
Published: April 1, 2024
Language: Английский
Citations
0