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Related Concept Videos

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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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: 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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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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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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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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Locally tuned hydrodynamics of active polymer chains.

Lisa Sappl1,2, Christos N Likos1, Andreas Zöttl1

  • 1Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria.

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Stiff active polymers exhibit distinct behaviors based on the active monomer's position. An active head monomer stiffens the chain, while an active tail causes crumpling and faster dynamics.

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Area of Science:

  • Polymer Physics
  • Soft Matter Physics
  • Mesoscopic Simulations

Background:

  • Active polymers are polymers with self-propelling units.
  • Their behavior in solution is crucial for understanding biological systems and synthetic materials.
  • Mesoscopic simulations offer a way to study these complex systems.

Purpose of the Study:

  • To investigate the influence of active monomer position on stiff and flexible polymer chains.
  • To analyze structural and dynamic properties under different activity scenarios.
  • To explore the role of hydrodynamic interactions in active polymer behavior.

Main Methods:

  • Mesoscopic simulations using multi-particle collision dynamics.
  • Modeling linear polymer chains with active head or tail monomers.
  • Inclusion and manipulation of hydrodynamic interactions via counterforces.

Main Results:

  • For stiff chains, active monomer position has minimal impact on structure and dynamics.
  • Active head monomers induce chain straightening (activity-induced stiffening).
  • Active tail monomers cause chain crumpling and reduced motion persistence.

Conclusions:

  • The position of activity is less critical for stiff polymers compared to flexible ones.
  • Activity-induced stiffening and crumpling are key behaviors dependent on active monomer location.
  • Hydrodynamic flow fields are tunable and influenced by internal force propagation.