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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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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.
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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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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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Types of Step-Growth Polymers: Polyesters01:20

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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Metallocene Based Polyolefin Nanocomposites.

Walter Kaminsky1

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

Materials (Basel, Switzerland)
|August 10, 2017
PubMed
Summary
This summary is machine-generated.

Synthesizing polyolefin nanocomposites using metallocene catalysts and nanofillers enhances material properties. This method allows precise polymer control, resulting in superior stiffness, flame retardancy, and barrier performance.

Keywords:
carbon nanotubesinorganic particlesmetallocene catalystspolyethylenepolyolefin nanocompositespolypropylenesilica balls

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Metallocene catalysts enable efficient in-situ polymerization for polyolefin nanocomposites.
  • Metallocene/methylaluminoxane (MAO) catalysts can be absorbed onto nanoparticles for surface polymerization.

Purpose of the Study:

  • To explore the synthesis of polyolefin nanocomposites using metallocene catalysts and nanofillers.
  • To investigate the impact of nanofiller incorporation on polymer properties.

Main Methods:

  • In-situ polymerization of olefins using metallocene/MAO catalysts on nanoparticle surfaces.
  • Controlled synthesis of polyethylene and polypropylene with defined microstructures.

Main Results:

  • Achieved precise control over polymer microstructure, tacticity, and stereoregularity.
  • Incorporation of nanofillers significantly enhanced properties like stiffness, gas barrier, and flame retardancy.
  • Resulting nanocomposites exhibit improved crystallization rates and mechanical strength.

Conclusions:

  • In-situ polymerization with metallocene catalysts offers a versatile route to high-performance polyolefin nanocomposites.
  • Nanofiller integration is key to unlocking advanced material characteristics for polyethylene and polypropylene.