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Related Concept Videos

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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...
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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...
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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 catalyst, high molecular...
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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.
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
07:28

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

New application for metallocene catalysts in olefin polymerization.

Walter Kaminsky1, Andreas Funck, Heinrich Hähnsen

  • 1Institute for Technical and Macromolecular Chemistry, University of Hamburg, Bundesstr. 45, D-20146, Hamburg, Germany. kaminsky@chemie.uni-hamburg.de

Dalton Transactions (Cambridge, England : 2003)
|October 15, 2009
PubMed
Summary
This summary is machine-generated.

Metallocene catalysts enable precise synthesis of polyolefins, including novel copolymers and nanocomposites. Understanding active sites will yield simpler co-catalysts for advanced material applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Catalysis

Background:

  • Metallocenes and transition metal complexes activated by methylaluminoxane are key catalysts in polyolefin synthesis.
  • These catalysts offer precise control over polymer microstructure, tacticity, and stereoregularity.
  • Current research focuses on understanding active sites to develop improved co-catalysts.

Purpose of the Study:

  • To explore the synthesis of advanced polyolefins using metallocene catalysts.
  • To investigate the copolymerization of ethene/propene with macromers and cyclic olefins.
  • To develop novel polyolefin nanocomposites with enhanced properties.

Main Methods:

  • Utilizing metallocene and transition metal catalysts activated by methylaluminoxane.
  • Performing in situ polymerization for creating polyolefin nanocomposites.
  • Copolymerizing ethene/propene with 1-olefin macromers (up to 12,000 g/mol) and cyclic olefins.

Main Results:

  • Synthesis of polyolefins with highly defined microstructure, tacticity, and stereoregularity.
  • Production of new copolymers, long chain branched polymers, and polyolefin nanocomposites.
  • Development of high molecular weight polypropenes filled with multi-walled carbon nanotubes exhibiting unique properties.

Conclusions:

  • Metallocene catalysts provide a powerful route to tailor polyolefin architectures and properties.
  • Further understanding of active sites promises simpler and more effective co-catalysts.
  • Advanced polyolefins, such as nanocomposites, offer significant potential for future material applications.