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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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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...
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Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Cationic Chain-Growth Polymerization: Mechanism00:57

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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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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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Anionic Chain-Growth Polymerization: Mechanism01:04

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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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Dynamics of self-threading ring polymers in a gel.

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Ring polymer dynamics in gels are hindered by self-threading, a phenomenon where rings pass through themselves. This extensive scaling with ring length impacts motion and may explain trapping in gel electrophoresis.

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Area of Science:

  • Polymer physics
  • Soft matter physics
  • Computational chemistry

Background:

  • Ring polymers exhibit complex dynamics distinct from linear polymers.
  • Confining environments like gels can significantly alter polymer diffusion.
  • Understanding polymer topology is crucial for predicting their behavior.

Purpose of the Study:

  • To investigate the influence of topology on ring polymer dynamics within a gel matrix.
  • To explore the phenomenon of self-threading and its effect on polymer motion.
  • To develop a computational model for simulating ring polymer diffusion in gels.

Main Methods:

  • Development of a novel algorithm to simulate ring polymer diffusion.
  • Incorporation of self-threading events into the simulation model.
  • Analysis of the relationship between ring length, self-threading, and diffusion dynamics.

Main Results:

  • The number of self-threadings scales extensively with ring length.
  • Self-threading is largely independent of specific model details.
  • Slower ring dynamics correlate with the fraction of mobile segments.

Conclusions:

  • Self-threading is a key factor limiting ring polymer motion in gels.
  • The findings offer a new perspective on ring polymer dynamics in complex environments.
  • This research may elucidate the mechanisms behind irreversible trapping in gel electrophoresis.