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Related Concept Videos

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

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Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Covalent Organic Framework-Supported Metallocene for Ethylene Polymerization.

Bangban Zhu1, Kan Liu1, Liqiong Luo2

  • 1State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering Zhejiang University, Hangzhou, 310027, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 21, 2023
PubMed
Summary
This summary is machine-generated.

Covalent organic framework (COF) materials effectively support metallocene catalysts for olefin polymerization. This COF-supported catalyst significantly boosts activity and enhances polyethylene properties, including molecular weight and strength.

Keywords:
covalent organic frameworksethylene polymerizationheterogenous polymerizationpolyolefinssupported metallocenes

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Catalysis

Background:

  • Supported catalysts enhance olefin polymerization performance.
  • Developing supported catalysts with controlled structures and compatibility is crucial for high activity and product quality.

Purpose of the Study:

  • To investigate the use of covalent organic framework (COF) materials as carriers for metallocene catalysts in ethylene polymerization.
  • To evaluate the catalytic activity and the properties of the resulting polyethylene (PE) using COF-supported catalysts.

Main Methods:

  • Synthesized COF materials as carriers for metallocene catalyst Cp2ZrCl2.
  • Conducted ethylene polymerization using both homogeneous and COF-supported catalysts.
  • Analyzed the catalytic activity, molecular weight, molecular weight distribution, melting point, microstructure, tensile strength, and elongation at break of the produced polyethylene.

Main Results:

  • The COF-supported catalyst exhibited significantly higher activity (31.1×10^6 g·mol⁻¹·h⁻¹) compared to the homogeneous catalyst (11.2×10^6 g·mol⁻¹·h⁻¹).
  • Polyethylene produced with COF-supported catalysts showed increased weight-average molecular weight (160 to 308 kDa) and narrower molecular weight distribution (3.3 to 2.2).
  • Enhanced mechanical properties were observed, including increased tensile strength (19.0 to 30.7 MPa) and elongation at break (350 to 1400%).

Conclusions:

  • COF materials are effective carriers for metallocene catalysts in olefin polymerization.
  • COF support enhances catalytic activity and improves polyethylene properties, leading to high-performance polyolefins.
  • This approach offers a promising route for developing advanced supported catalysts and functional polyolefins.