Ethylene–Norbornene Copolymers DOI
Mingyuan Li, Zhengguo Cai

Encyclopedia of Polymer Science and Technology, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 17

Published: Nov. 30, 2024

Abstract Ethylene–norbornene copolymers are a significant kind of cyclic olefin copolymer (COC) produced by vinyl‐type coordination copolymerization ethylene and norbornene catalyzed transition metal catalysts. These totally amorphous strong, stiff, highly transparent, colorless. They have very high moisture barrier interesting electrical properties. The became commercially available in 2001, products can be obtained from manufacturers such as Polyplastics. This article describes the microstructures, properties, manufacturing, processing, applications this polymeric materials. A basic background on general COC materials is provided introduction. Then dependency relationship between microstructure property mainly discussed. diversified systems, including metallocene catalysts post‐metallocene catalysts, for E–NBE manufacturing been revealed. processing selected also summarized.

Language: Английский

Synthesis of Branched Cyclo-Olefin Copolymers Using Neutral α-Sulfonate-β-Diimine Nickel Catalyst DOI Creative Commons

Donghui Li,

Lixia Pei, Wenbo Du

et al.

Molecules, Journal Year: 2025, Volume and Issue: 30(1), P. 157 - 157

Published: Jan. 3, 2025

The homopolymerization of norbornene and the copolymerization ethylene were carried out using neutral α-sulfonate-β-diimine nickel catalyst SD-Ni. is highly active in norbornene, producing vinyl-addition polynorbornene (PNB) with a high molecular weight. (NB) (E) SD-Ni was also investigated. shows distinctive catalytic properties to produce high-molecular-weight E-NB copolymers low incorporation. Importantly, microstructure analyses confirm that resultant are branched cyclo-olefin (COCs) polyethylene units.

Language: Английский

Citations

2
High-Refractive-Index Ethylene/Cyclic Olefin/Octene Terpolymers with High Optical Transparency DOI
Yihua Zhao, Lei Cui, Yixin Zhang

et al.

Polymer, Journal Year: 2025, Volume and Issue: unknown, P. 128147 - 128147

Published: Feb. 1, 2025

Language: Английский

Citations

0
Synthesis, Characterization, and Comparative Study on Norbornene Polymerization of CNN and PCN Pincer Palladium Complexes DOI Creative Commons

Huizhu Wang,

Jin-Kui Liu,

Yidong Wang

et al.

Molecules, Journal Year: 2025, Volume and Issue: 30(7), P. 1530 - 1530

Published: March 30, 2025

Several CNN pincer Pd(II) complexes including chiral 1a–e with 2-phenyl-6-(oxazolinyl)pyridines and achiral ones 2a–c N-substituted-2-aminomethyl-6-phenylpyridines were prepared. In addition, the preparation of PCN 3a–e aryl-based phosphinite–imine ligands 4a–c phosphinite–imidazoline was also performed. Among them, pincers new readily synthesized from commercially available materials in only two steps. The characterized through elemental analyses, namely 1H NMR, 13C{1H} 31P{1H} NMR spectroscopies. Furthermore, molecular structure complex 3a determined via X-ray single-crystal diffraction analysis. presence EtAlCl2, Et2AlCl, or methylaluminoxane (MAO), exhibited excellent activities monomer conversion rates norbornene addition polymerization. Surprisingly, a higher rate (99.5%) Et2AlCl as cocatalyst, while showed (98.8%) MAO.

Language: Английский

Citations

0
Tandem ROMP/Vinyl‐Addition Polymerization of Norbornene Catalyzed by a Ru/Ni Heterobimetallic Complex DOI Open Access
Douglas H. N. Santos, Gustavo Henrique Cicero Masson, Eliada A. Silva

et al.

Journal of Polymer Science, Journal Year: 2025, Volume and Issue: unknown

Published: March 29, 2025

ABSTRACT The new compound (1S,4S)‐ N ‐(4‐iodophenyl)bicyclo[2.2.1]hept‐5‐en‐2‐carboxamide ( NBE–amide‐I ) was synthesized using 4‐iodoaniline and 5‐norbornene‐2‐carboxylic acid. then used in an oxidative addition reaction with [Ni(PPh 3 4 ] to obtain the complex [NiI(NBE–amide)(PPh 2 Ni–NBE ). complexes [Ni(NBE–amide)(PPh )(Schiff–cyclohexane)] (mono‐Schiff–Ni) [{RuCl (η 6 ‐ p ‐cymene)}μ{(Schiff‐pip)Ni(aryl–NBE)(PPh )}] Ru–Ni–NBE were via a one‐pot Ni–NBE, salicylaldehyde, 4‐(aminomethyl)piperidine or [RuCl ‐cymene)(piperidine‐(4‐aminomethyl))] (mono‐RuPip), respectively, dichloromethane for 16 h. mono‐Ni–Schiff fully characterized FTIR, UV–Vis, 1 H 31 P{ H} NMR, MALDI–TOF, EPR, cyclic voltammetry. These evaluated as precatalysts vinyl‐addition polymerization of norbornene (NBE), achieving yields 91% 71%, methylaluminoxane (MAO) cocatalyst (Al/[Ni] = 2000). also shown be active ring‐opening metathesis (ROMP) NBE, up 50% presence 10 equivalents (trimethylsilyl)diazomethane (TMSDM) carbene source. synthesis copolymer based on assisted‐tandem catalysis, combining ROMP NBE , conducted through sequential TMSDM MAO under previously optimized conditions. by GPC, Raman scattering, SEM.

Language: Английский

Citations

0
Synthesis and self-assembly of a diblock copolymer consisting of a cyclic olefin copolymer and polycaprolactone DOI

Yu-Kai Chuang,

Jing-Wen Su,

Yu-Chuan Sung

et al.

Polymer Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Cyclic olefin copolymer- block -polycaprolactone was prepared through a metallocene-catalyst mediated selective chain transfer pathway. The resulting diblock copolymer can self-organize into an ordered nanopattern molecular self-assembly.

Language: Английский

Citations

0
Fluorinated Cyclic Olefin Copolymers (COCs) and Cyclic Olefin Polymers (COPs) DOI Open Access
Jian Zhang, Yixin Zhang, Lei Cui

et al.

Macromolecular Rapid Communications, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 13, 2025

Abstract The demand for insulating materials with superior dielectric properties has increased. Among these materials, polymers containing cyclic structure including olefin copolymer (COC) and polymer (COP) stand out because of their excellent originating from the pure hydrocarbon structure. Introducing fluorine into is one efficient strategy optimizing related important properties. Here, three fluorinated norbornene derivatives high content are synthesized copolymerized via coordination‐insertion polymerization (CIP) ring‐opening metathesis (ROMP). obtained COCs COPs have contents (up to 48.2 wt.%) exhibit constant ( D k ) 2.11‐2.24 loss f 0.0021‐0.0031 at 10 GHz. Moreover, fluoropolymers show good solvent tolerance, toughness (elongation break up 779%), enhanced thermal stability T d,5% 427–440 °C), low hydrophilicity (water uptake <0.01%), gas separation These results imply that suitable as a potential candidate substrate material utilized in application materials.

Language: Английский

Citations

0
Synthesis of Imine-Phenoxy Ligated Palladium Complexes for Norbornene Homopolymerization DOI
Rajkumar S. Birajdar, Poonam Gupta, Rajesh G. Gonnade

et al.

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 64(1), P. 25 - 36

Published: Dec. 26, 2024

Metal complexes with tunable ligands play a crucial role in olefin polymerization and impart control over molecular weight, crystallinity, stereoregularity. We report the single-step synthesis of imine-phenoxy excellent yields (81–93%). The identity electronically tuned was unambiguously ascertained by using combination spectroscopic analytical methods. These were treated [Pd(COD)MeCl] presence 2,6-lutidine, resulting formation discrete mononuclear palladium Pd1–Pd4 yields. 1–2D NMR spectroscopy, mass spectrometry analysis, single-crystal X-ray diffraction confirmed complexes. analysis revealed distorted square planar geometry around center. Proton suggested that Pd1 catalyst deshielded, indicating deficient metal compared to other Moreover, showed highest buried volume percentage (%Vbur = 44.9). When exposed norbornene, found be active produced poly(norbornene) (PNB). High-temperature SEC sterically hindered weight polymer (PNB 37.4 kDa). Boron aluminum-based cocatalysts screened, MMAO outperform others high catalytic activity (up 63.2 × 105 g PNB (mol Pd)−1 h–1).

Language: Английский

Citations

1
Ethylene–Norbornene Copolymers DOI
Mingyuan Li, Zhengguo Cai

Encyclopedia of Polymer Science and Technology, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 17

Published: Nov. 30, 2024

Abstract Ethylene–norbornene copolymers are a significant kind of cyclic olefin copolymer (COC) produced by vinyl‐type coordination copolymerization ethylene and norbornene catalyzed transition metal catalysts. These totally amorphous strong, stiff, highly transparent, colorless. They have very high moisture barrier interesting electrical properties. The became commercially available in 2001, products can be obtained from manufacturers such as Polyplastics. This article describes the microstructures, properties, manufacturing, processing, applications this polymeric materials. A basic background on general COC materials is provided introduction. Then dependency relationship between microstructure property mainly discussed. diversified systems, including metallocene catalysts post‐metallocene catalysts, for E–NBE manufacturing been revealed. processing selected also summarized.

Language: Английский

Citations

0