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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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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: 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 conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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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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Macromolecules with branched architecture via radical polymerization: Insight from computer simulations.

Konstantin O Borodin1,2, Artem V Sergeev1,2, Elena Yu Kozhunova1,3

  • 1Lomonosov Moscow State University, Faculty of Physics, Moscow 119991, Russia.

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Summary
This summary is machine-generated.

This study developed a molecular dynamics model for branched polymer synthesis using radical polymerization (RP). Increasing chain-transfer agent (CTA) content shifts gelation, enabling the formation of high-molecular-weight branched polymers.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Branched polymers offer tunable properties but are difficult to synthesize with desired characteristics via conventional radical polymerization (RP).
  • A systematic investigation into controlling macromolecular architecture during RP is lacking.

Purpose of the Study:

  • To develop a computational model for simulating branched polymer formation using RP.
  • To investigate the influence of crosslinker (CL) and chain-transfer agent (CTA) concentrations on polymer architecture and solubility.

Main Methods:

  • A three-dimensional coarse-grained molecular-dynamics model based on the Kremer-Grest framework was employed.
  • Simulations incorporated stochastic reactions including initiation, propagation, crosslinking, chain transfer, and termination.
  • Macromolecular architecture was analyzed using graph-based decomposition and fractal dimension calculations.

Main Results:

  • Two distinct polymerization regimes were identified based on CTA content.
  • Low CTA content led to early gelation and a network-dominated system.
  • Increased CTA content shifted gelation to higher conversions, promoting a soluble fraction of high-molecular-weight branched polymers.
  • An optimal condition [CL] = 2[CTA] was found for achieving high conversion gelation, yielding soluble branched macromolecules.

Conclusions:

  • The study provides quantitative guidance for synthesizing soluble branched polymers using standard RP.
  • Control over reagent ratios (CL and CTA) is crucial for tailoring polymer architecture and achieving desired properties.