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Related Concept Videos

Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Radical Chain-Growth Polymerization: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Radical Chain-Growth Polymerization: Overview01:10

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Polymers: Molecular Weight Distribution01:10

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Related Experiment Video

Updated: Jan 10, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Polymer Systems with Correlated Activity: Stars Versus Linear Chains.

Aleksandr I Buglakov1,2, Prabha Chuphal3, Vladimir Yu Rudyak4

  • 1Semenov Federal Research Center for Chemical Physics, Kosygina, 4, 119991 Moscow, Russia.

Molecules (Basel, Switzerland)
|November 27, 2025
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Summary
This summary is machine-generated.

Correlated activity in active polymers causes significant stretching and unique dynamics, unlike uncorrelated systems. This finding is crucial for understanding active polymer behavior and modeling experimental observations.

Keywords:
active Brownian particleactive matteractive polymerscorrelated activitygyration radiusstar polymersstretching

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Area of Science:

  • Polymer Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Active polymers exhibit complex behaviors driven by internal energy consumption.
  • Star topology influences polymer conformation and dynamics.
  • Understanding monomer activity correlations is key to predicting active polymer behavior.

Purpose of the Study:

  • To investigate the effects of correlated monomer activity and star topology on active polymer structure and dynamics.
  • To compare the behavior of correlated active polymer stars with uncorrelated active Brownian particle (ABP) stars.

Main Methods:

  • Utilizing molecular dynamics simulations.
  • Analyzing the structural and dynamic properties of active star polymers under varying activity correlations.

Main Results:

  • Correlated activity induces significant stretching in star polymers at intermediate activity levels.
  • Observed transitions between distinct, metastable states driven by coordinated arm movements.
  • Novel collective dynamics emerge due to correlated activity.

Conclusions:

  • Activity correlations play a critical role in determining the structure and dynamics of active polymers.
  • The observed phenomena align with experimental findings in active oligomers.
  • Accurate modeling of active polymers necessitates the inclusion of activity correlations.