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Related Concept Videos

Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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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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...
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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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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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: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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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Recrystallization: Solid–Solution Equilibria01:10

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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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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Controlling solvent quality by time: Self-avoiding sprints in nonequilibrium polymerization.

Michael Bley1, Upayan Baul1, Joachim Dzubiella1,2

  • 1Applied Theoretical Physics-Computational Physics, Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany.

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During nonequilibrium polymerization, polymers exhibit unexpected self-avoiding walk behavior due to monomer depletion and slow chain relaxation. This finding impacts polymer processing and materials science applications.

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Area of Science:

  • Polymer Physics
  • Soft Matter Physics
  • Materials Science

Background:

  • Macromolecular conformations in equilibrium follow universal scaling laws, crucial for soft matter and materials.
  • Understanding polymer behavior under nonequilibrium conditions is essential for advanced applications.

Purpose of the Study:

  • To investigate how scaling laws change during diffusion-influenced, nonequilibrium chain-growth polymerization.
  • To reveal the underlying mechanisms behind altered polymer conformations in nonequilibrium polymerization.

Main Methods:

  • Monomer-resolved, off-lattice reaction-diffusion computer simulations.
  • Analysis of nonequilibrium monomer density depletion correlations.
  • Comparison of chain relaxation times with polymerization reaction times.

Main Results:

  • Growing polymers exhibit self-avoiding walk behavior in poor and θ solvents under nonequilibrium conditions.
  • Nonequilibrium monomer density depletion creates locally directed and self-avoiding growth.
  • Chain relaxation times exceeding polymerization reaction times contribute to this phenomenon.
  • Reaction-driven diffusion ('sprints') facilitates these nonequilibrium mechanisms.

Conclusions:

  • Nonequilibrium polymerization fundamentally alters polymer scaling laws.
  • The observed self-avoiding walk behavior is driven by intrinsic nonequilibrium mechanisms.
  • Findings offer insights for controlled structure formation in polymer processing, including reactive self-assembly and 3D printing.