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Related Concept Videos

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into the...
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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Related Experiment Video

Updated: May 14, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Anomalous dynamics in 2D polymer melts.

H Meyer1, A N Semenov

  • 1Institut Charles Sadron, CNRS UPR 22, Université de Strasbourg, 23 rue du Loess, 67034 Strasbourg, France.

Physical Review Letters
|February 2, 2013
PubMed
Summary
This summary is machine-generated.

Polymer chain dynamics in 2D systems differ from bulk due to confinement. Viscoelastic hydrodynamic interactions and other factors cause anomalous subdiffusion, explained by a new theory supported by simulations.

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Related Experiment Videos

Last Updated: May 14, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
11:03

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

Area of Science:

  • Polymer Physics
  • Soft Matter Physics
  • Condensed Matter Theory

Background:

  • Polymer dynamics in bulk differ significantly from confined systems.
  • Chains in 2D conformations exhibit unique diffusion properties due to restricted movement.
  • Understanding these dynamics is crucial for materials science and nanotechnology.

Purpose of the Study:

  • To investigate the anomalous chain diffusion in 2D polymer monolayers.
  • To develop a quantitative analytical theory explaining these dynamics.
  • To elucidate the interplay of factors governing polymer motion in confined 2D environments.

Main Methods:

  • Development of a quantitative analytical theory for polymer subdiffusion in 2D.
  • Extensive molecular-dynamics simulations (momentum-conserving and Langevin).
  • Comparison of theoretical predictions with simulation data.

Main Results:

  • Viscoelastic hydrodynamic interactions are identified as a major factor in anomalous diffusion.
  • A complex behavior is revealed, influenced by inertial, viscoelastic, frictional, and finite-box-size effects.
  • The theory successfully explains the highly cooperative nature of 2D polymer motions.

Conclusions:

  • The developed theory accurately describes polymer subdiffusion in 2D.
  • Chain confinement leads to distinct dynamics governed by specific interactions.
  • Simulations validate the theoretical framework, highlighting cooperative motion in 2D polymer systems.