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Related Concept Videos

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.
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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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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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Published on: June 8, 2016

Submicron polyethylene particles from catalytic emulsion polymerization.

Florian M Bauers1, Ralf Thomann, Stefan Mecking

  • 1Institut für Makromolekulare Chemie und Freiburger Materialforschungszentrum der Albert-Ludwigs-Universität Freiburg, Stefan-Meier-Strasse 31, D-79104 Freiburg, Germany.

Journal of the American Chemical Society
|July 17, 2003
PubMed
Summary
This summary is machine-generated.

Linear polyethylene particles synthesized via emulsion polymerization exhibit unique lentil-like shapes and lamellar structures. This method leads to distinct crystallization behavior within submicron droplets, differing from bulk polyethylene.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Linear polyethylene particles are typically produced via bulk polymerization.
  • Catalytic emulsion polymerization offers an alternative route for synthesizing polyethylene nanoparticles.
  • Understanding the morphology and crystallization of these nanoparticles is crucial for their applications.

Purpose of the Study:

  • To characterize the morphology and structure of linear polyethylene particles synthesized by catalytic emulsion polymerization.
  • To investigate the crystallization behavior of these nanoparticles during emulsion polymerization.
  • To compare the crystallization process with conventional bulk polyethylene.

Main Methods:

  • Transmission Electron Microscopy (TEM) for particle morphology and lamellar thickness.
  • Atomic Force Microscopy (AFM) for particle dimensions and aspect ratio.
  • Catalytic emulsion polymerization of ethylene.

Main Results:

  • Polyethylene particles displayed a nonspherical, lentil-like shape with an average aspect ratio of approximately 10.
  • Particles exhibited lamellar stacking along their shorter axis, with some particles consisting of a single lamella.
  • Lamellar thickness ranged from 9-11 nm, influenced by polymerization temperature.
  • Individual crystallization of submicron droplets occurred, leading to significant supercooling (around 55°C).

Conclusions:

  • Catalytic emulsion polymerization yields unique lentil-shaped polyethylene nanoparticles with distinct lamellar structures.
  • The crystallization process in emulsion polymerization is characterized by independent droplet crystallization and substantial supercooling.
  • These findings offer insights into nanoparticle formation and crystallization mechanisms in polymerization.