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Related Concept Videos

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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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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Step-Growth Polymerization: Overview01:03

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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.
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Radical Chain-Growth Polymerization: Mechanism01:09

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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...
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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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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...
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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The coil-globule transition in self-avoiding active polymers.

S Das1, N Kennedy, A Cacciuto

  • 1Department of Chemistry, Columbia University, 3000 Broadway, New York, NY 10027, USA. ac2822@columbia.edu.

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Summary
This summary is machine-generated.

This study simulates active polymers, finding that temperature rescaling can predict coil-globule transitions. Active fluctuations influence polymer behavior, suggesting a negative active pressure may be present.

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Area of Science:

  • Polymer physics
  • Soft matter physics
  • Statistical mechanics

Background:

  • Active polymers exhibit unique behaviors driven by internal energy dissipation.
  • Understanding the coil-globule transition is crucial for polymer science.
  • Solvent quality significantly impacts polymer conformation.

Purpose of the Study:

  • To investigate the coil-globule transition in active flexible polymers.
  • To determine the effect of solvent quality and active forces on polymer behavior.
  • To explore the relationship between active fluctuations and polymer phase transitions.

Main Methods:

  • Numerical simulations of active, fully flexible, self-avoiding polymers.
  • Varying effective monomer-monomer interactions to represent solvent quality.
  • Extracting the Flory exponent to analyze polymer conformations.
  • Analyzing the coil-globule transition point under different active force strengths.

Main Results:

  • The coil-globule transition point is sensitive to the strength of active forces.
  • A simple temperature rescaling qualitatively captures the polymer's Θ-point dependence on active fluctuations.
  • Active fluctuations can be mapped to changes in effective temperature.

Conclusions:

  • Temperature rescaling offers a useful, albeit approximate, method for understanding active polymer behavior.
  • Active polymers may exhibit a negative active pressure, similar to active hard spheres.
  • Further research is needed to fully elucidate the role of active pressure in polymer systems.