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Related Concept Videos

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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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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Temperature Dependence on Reaction Rate02:55

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The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
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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: 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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In-Situ Thermometry Reveals Fragmentation Behavior Based on Local Temperature in α-Olefin Polymerization Catalysts.

Joren M Dorresteijn1, Bas Terlingen1, Koen W Bossers1

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Summary

This study reveals how heterogeneous catalysts fragment during olefin polymerization, linking temperature changes to structural evolution. Luminescence thermometry precisely monitored catalyst fragmentation and temperature fluctuations during ethylene polymerization.

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Area of Science:

  • Catalysis
  • Polymer Science
  • Materials Science

Background:

  • Industrial olefin polymerization relies on heterogeneous catalysts that fragment during reaction.
  • Catalyst fragmentation exposes active sites, influencing polymerization kinetics and product properties.
  • Understanding fragmentation mechanisms and their link to temperature is crucial for process optimization.

Purpose of the Study:

  • To investigate the fragmentation behavior of heterogeneous catalysts during olefin polymerization.
  • To correlate temperature fluctuations with catalyst structural changes and polymerization kinetics.
  • To demonstrate a novel method for probing catalyst particle temperatures in situ.

Main Methods:

  • Utilized a Nd-doped LaOCl-supported metallocene model catalyst system.
  • Employed luminescence thermometry to monitor temperature changes in catalyst particles.
  • Observed and analyzed catalyst fragmentation patterns during gas-phase ethylene polymerization.

Main Results:

  • Observed a +43 °C temperature increase during ethylene polymerization, confirming reaction exothermicity.
  • Detailed the layer-by-layer shell rupture and bisectional core fragmentation of the catalyst.
  • Successfully probed individual catalyst particle temperatures, correlating them with structural evolution.

Conclusions:

  • Luminescence thermometry provides a powerful tool for studying heterogeneous catalysis.
  • Catalyst fragmentation is a temperature-dependent process influencing polymerization.
  • The developed methodology can be applied to various heterogeneous catalytic systems for in-depth analysis.